Transverse Profile Monitors
Paper Title Page
MOPG61 AXD Measurements at SOLEIL 209
 
  • M. Labat, M. El Ajjouri, N. Hubert, D. Pédeau, M. Ribbens, M.-A. Tordeux
    SOLEIL, Gif-sur-Yvette, France
 
  A first prototype of in-Air X-ray Detector (AXD) has been installed on the SOLEIL storage ring. An AXD simply consists of a scintillator, an objective and a camera installed in air behind the absorber of the bending magnet's synchrotron radiation layer. The radiation vertical profile analysis easily enables to retrieve the vertical beam size of the electron beam at the source point. This simple diagnostics opens large perspectives of beam size measurement all around the ring for an accurate caracterization of the beam and improvment of its stability survey.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG61  
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MOPG63 Recent Beam Size Measurement Result Using Synchrotron Radiation Inteferometer in TPS 217
 
  • M.L. Chen, H.C. Ho, K.H. Hsu, D.-G. Huang, C.K. Kuan, W.Y. Lai, C.J. Lin, S.Y. Perng, C.W. Tsai, T.C. Tseng, H.S. Wang
    NSRRC, Hsinchu, Taiwan
 
  Taiwan Photon Source (TPS) has operated in 2015. An optical diagnostic beam line is constructed in TPS 40th section for the diagnostics of the electron beam properties. One instrument of the optical diagnostic beam line is a synchrotron radiation interferometer, which is operated for monitoring the beam size. By improving the optical alignment and air disturbance, the beam size is performed stable. This paper presents the modifications and recent measurement results.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG63  
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MOPG65 Frascati Beam-Test Facility (BTF) High Resolution Beam Spot Diagnostics 221
 
  • P. Valente
    INFN-Roma, Roma, Italy
  • B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
    INFN/LNF, Frascati (Roma), Italy
 
  Funding: Istituto Nazionale di Fisica Nucleare. Supported by the H2020 project AIDA-2020, GA no. 654168
The DAΦNE Beam Test Facility (BTF) is operational in Frascati since 2003. In the last years the beam diagnostics tools have been completely renewed and the services for users have been largely improved. We describe here the new transverse beam diagnostics based on new GEM TPC detectors and MEDIPIX Silicon pixel detectors, the renewed DAQ system and the data caching system based on MEMCACHED and the integration of the new sub-systems in the new data-logging. Results on the optimization of the transverse beam spot and divergence are reported as well as the real-time diagnostics and feedback user experience.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG65  
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MOPG66 Design and Experimental Tests of the SwissFEL Wire-Scanners 225
 
  • G.L. Orlandi, R. Ischebeck, C. Ozkan Loch, V. Schlott
    PSI, Villigen PSI, Switzerland
  • M. Ferianis, G. Penco
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
 
  The SwissFEL wire-scanner (WSC) composes of an in-vacuum beam-probe - motorized by a stepper motor - and an out-vacuum pick-up of the wire-signal. In SwissFEL, WSCs will absolve two main tasks: high precision measurement of the beam profile for determining the beam emittance as a complement to view-screens; routine monitoring of the beam profile under FEL operations. In order to fulfill the aforementioned tasks, the design of the in-vacuum component of the SwissFEL WSCs followed the guidelines to ensure a mechanical stability of the scanning wire at the micrometer level as well as a significative containment of the radiation-dose release along the machine thanks to the choice of metallic wires with low density and Atomic number. Beam-loss monitors have been suitably designed to ensure a sufficient sensitivity and dynamics to detect signals from scanned beams in the charge range 10-200 pC. The design, the prototyping phases, the bench and electron-beam tests - performed at SITF (Paul Scherrer Institut) and FERMI (Elettra, Trieste) - of the entire SwissFEL WSC set-up will be presented.
Contribution accepted for publication in Physical Review Accelerators and Beams
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG66  
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MOPG68 Development and Commissioning of the Next Generation X-ray Beam Size Monitor in CESR 229
 
  • N.T. Rider, S.T. Barrett, M.G. Billing, J.V. Conway, B.K. Heltsley, A.A. Mikhailichenko, D.P. Peterson, D. L. Rubin, J.P. Shanks, S. Wang
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
 
  Funding: Work supported by NSF grant PHY-0734867, PHY-1002467 and DOE grant DE-FC02-08ER41538, DE-SC0006505
The CESR Test Accelerator (CesrTA) program targets the study of beam physics issues relevant to linear collider damping rings and other low emittance storage rings. This endeavor requires new instrumentation to study the beam dynamics along trains of ultra-low emittance bunches. A key element of the program has been the design, commissioning and operation of an x-ray beam size monitor capable, on a turn by turn basis, of collecting single pass measurements of each individual bunch in a train over many thousands of turns. The x-ray beam size monitor development has matured to include the design of a new instrument which has been permanently integrated into the storage ring. A new beam line has been designed and constructed which allows for the extraction of x-rays from the positron beam using a newly developed electro magnet pair. This new instrument utilizes custom, high bandwidth amplifiers and digitization hardware and firmware to collect signals from a linear InGaAs diode array. This paper reports on the development of this new instrument and its integration into storage ring operation including vacuum component design, electromagnet design, electronics and capabilities.
 
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MOPG69 Study of YAG Exposure Time for LEReC RF Diagnostic Beamline 233
 
  • S. Seletskiy, T.A. Miller, P. Thieberger
    BNL, Upton, Long Island, New York, USA
 
  The LEReC RF diagnostic beamline is supposed to ac-cept 250 us long bunch trains of 1.6 MeV ' 2.6 MeV (kinetic energy) electrons. This beamline is equipped with a YAG profile monitor. Since we are interested in observ-ing only the last bunch in the train, one of the possibilities is to install a fast kicker and a dedicated dump upstream of the YAG screen and related diagnostic equipment. This approach is expensive and challenging from an engineer-ing point of view. Another possibility is to send the whole bunch train to the YAG screen and to use a fast gated camera to observe the image from the last bunch only. In this paper we demonstrate the feasibility of the last ap-proach, which significantly simplifies the overall design of the RF diagnostic beamline.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG69  
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MOPG70 Transverse Beam Profiling and Vertical Emittance Control with a Double-Slit Stellar Interferometer 236
 
  • W.J. Corbett, X. Huang, J. Wu
    SLAC, Menlo Park, California, USA
  • C.L. Li, W.J. Zhang
    East China University of Science and Technology, Shanghai, People's Republic of China
  • T.M. Mitsuhashi
    KEK, Ibaraki, Japan
  • Y.H. Xu
    DongHua University, Songjiang, People's Republic of China
  • W.J. Zhang
    University of Saskatchewan, Saskatoon, Canada
 
  Double-slit interferometers are useful tools to measure the transverse the cross-section of relativistic charged particle beams emitting incoherent synchrotron radiation. By rotating the double-slit about the beam propagation axis, the transverse beam profile can be reconstructed including beam tilt at the source. The interferometer can also be used as a sensitive monitor for vertical emittance control. In this paper we outline a simple derivation of the Van Cittert-Zernike theorem, present results for a rotating double-slit measurement and demonstrate application of the interferometer to vertical emittance control using the Robust Conjugate Direction Search (RCDS) optimization algorithm.  
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MOPG71 Polarization Measurement and Modeling of Visible Synchrotron Radiation at Spear3 240
 
  • C.L. Li, W.J. Zhang
    East China University of Science and Technology, Shanghai, People's Republic of China
  • W.J. Corbett
    SLAC, Menlo Park, California, USA
  • Y.H. Xu
    DongHua University, Songjiang, People's Republic of China
  • W.J. Zhang
    University of Saskatchewan, Saskatoon, Canada
 
  Synchrotron radiation from dipole magnets is linearly polarized in the plane of acceleration and evolves toward circular polarization with increasing vertical observation angle. The intensity of the x-y field components can be modeled with Schwinger's theory for the angular-spectral power distribution. Combined with Fresnel's laws for reflection at a mirror surface, it is possible to model field polarization of visible SR light in the laboratory. The polarization can also be measured with a polarizer and quarter wave plate to yield Stokes' parameters S0-S3. In this paper we present measurements and modeling of the visible SPEAR3 SR beam in terms of Stokes' parameters and plot on the results on the Poincaré sphere.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG71  
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MOPG72 Diagnostic Test-Beam-Line for the Injector of MESA 244
 
  • I. Alexander, K. Aulenbacher
    IKP, Mainz, Germany
 
  Funding: Work supported by the German Science Foundation (DFG) under the Cluster of Excellence PRISMA
For the planed Mainzer Energy-recovering Superconducting Accelerator (MESA) at the Johannes Gutenberg-University in Mainz a diagnostic test-beam-line has been build up. The beam-line comprises three analyzing stations to investigate space charge caused transverse emittance growth of an 100 keV electron beam. To create the electron bunches two different rf syncronized laser diodes (405 nm & 520 nm) are used. Furthermore, a circular deflecting cavity allows to measure the longitudinal bunch intensity profile. The components and the latest results will be described and an outlook towards further applications will be given.
 
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MOPG73 Transverse Beam Size Diagnostics using Brownian Nanoparticles at ALBA 248
 
  • M. Siano, B. Paroli, M.A.C. Potenza
    Universita' degli Studi di Milano & INFN, Milano, Italy
  • A. Goldblatt, S. Mazzoni, G. Trad
    CERN, Geneva, Switzerland
  • U. Iriso, A.A. Nosych, L. Torino
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
 
  In this work we describe a novel beam diagnostic method based on coherence characterization of broad-spectrum bending magnet radiation through the Heterodyne Near Field Scattering (HNFS) technique. HNFS is a self-referencing technique based on the interference between the transmitted beam and the spherical waves scattered by each particle of a colloidal suspension. The resulting single-particle interferogram shows circular fringes modulated by the spatio-temporal Complex Coherence Factor (CCF) of the radiation. Superposition of a number of these patterns results in a stochastic speckle field, from which spatial and temporal coherence information of the source can be retrieved in near field conditions. Here we describe the basics of this technique, the experimental setup mounted along the hard X-ray pinhole at the ALBA synchrotron light source, and the possibility of transverse electron beam size retrieval from the spatial coherence function of the emitted dipole radiation. We also show preliminary results concerning power spectral density of visible synchrotron radiation as obtained from temporal coherence.  
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MOPG74 Design and Performance of Coronagraph for Beam Halo Measurements in the LHC 253
 
  • A. Goldblatt, E. Bravin, F. Roncarolo, G. Trad
    CERN, Geneva, Switzerland
  • T.M. Mitsuhashi
    KEK, Ibaraki, Japan
 
  The CERN Large Hadron Collider is equipped with two Beam Synchrotron Radiation (BSR) systems, one per beam, used to monitor the transverse distribution of the beam, its longitudinal distribution and the abort gap population. During the 2015-2016 winter shut-down period, one of the two BSR systems was equipped with a prototype beam halo monitor, based on the coronagraph technique, classically used in astrophysics telescopes to measure the sun corona. The system design, as well as its optics, was inherited from the coronagraph used in the KEK Photon Factory with some modifications made in order to satisfy the LHC BSR source constraints. This project is in the framework of the HL-LHC project, for which there is the requirement to monitor the beam halo at the level of 10-6 of the core intensity. This first prototype has been designed as a demonstrator system aimed at resolving a halo-core contrast in the 10-3 to 10-4 range. After discussing the design of the LHC coronagraph and its technical implementation, this contribution presents the result of the first tests with beam and the planned system upgrades for 2017.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG74  
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MOPG75 Single Shot Transversal Profile Monitoring of Ultra Low Charge Relativistic Electron Bunches at REGAE 257
 
  • H. Delsim-Hashemi
    DESY, Hamburg, Germany
 
  Relativistic electron microscopes are increasingly under consideration in dream experiments of observing atomic scale motions as they occur. Compared to ordinary electron microscopes with energies limited to few tens of keV, relativistic electrons reduce strongly the space-charge effects. This enables packing more electrons in shorter bunches and thereby capturing atomic scale ultra-fast dynamics in single shot. A typical relativistic-electron-microscope, based on an RF-gun, can provide experiments with couple of thousands to millions of electrons bunched in a few μm length and a transversal dimension of a fraction of a mm. After scattering from a sample and at the position of detector, electrons are distributed over transversal dimensions typically two orders of magnitude larger. For transversal diagnostics before scattering a cost effective solution is implemented while for diffraction pattern detection objective is single-electron imaging with good signal to noise ratio in single shot. In this contribution the implementations and results at REGAE will be presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG75  
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MOPG76 A Scintillating Fibre Beam Profile Monitor for the Experimental Areas of the SPS at CERN 261
 
  • I. Ortega Ruiz, J. Spanggaard, G. Tranquille
    CERN, Geneva, Switzerland
  • A. Bay, G.J. Haefeli
    EPFL, Lausanne, Switzerland
 
  The CERN Super Proton Synchrotron (SPS) delivers a wide spectrum of particle beams (hadrons, leptons and heavy ions) that can vary greatly in momentum and intensity. The profile and position of these beams are measured using particle detectors. However, the current systems show several problems that limit the quality of such monitoring. We have researched a new monitor made of scintillating fibres read-out with Silicon Photomultipliers (SiPM), which has the potential to perform better in terms of material budget, range of intensities measured and available detector size. In addition, it also has particle counting capabilities, extending its use to spectrometry or Time-Of-Flight measurements. Its radiation hardness is good to guarantee years of functioning. We have successfully tested a first prototype of this detector with different particle beams at CERN, giving accurate profile measurements over a wide range of energies and intensities. It only showed problems during operation with lead ion beams, believed to come from crosstalk between the fibres. Investigations are ongoing on alternative photodetectors, the electronics readout and solutions to the fibre crosstalk.  
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MOPG77 Design and Application of the Wire Scanner for CADS Proton Beams 265
 
  • L. Yu, J.S. Cao, H. Geng, C. Meng, Y.F. Sui
    IHEP, Beijing, People's Republic of China
 
  CADS Injector-I accelerator is a 10-mA 10-MeV CW proton linac, which uses a 3.2-MeV normal conducting 4-Vane RFQ and superconducting single-spoke cavities for accelerating. Eight wire scanners are designed and used to measure the beam profile of CADS Injector-I. In this paper principal of operation, instrumentation and programming of these wire scanners are discussed. Some results of beam profile and emittance measurement with these wire scanners are also presented.  
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MOPG78 Scintillation and OTR Screen Characterization with a 440 GeV/c Proton Beam in Air at the CERN HiRadMat Facility 268
 
  • S. Burger, B. Biskup, S. Mazzoni, M. Turner
    CERN, Geneva, Switzerland
  • B. Biskup
    Czech Technical University, Prague 6, Czech Republic
  • M. Turner
    TUG/ITP, Graz, Austria
 
  Beam observation systems, based on charged particles passing through a light emitting screen, are widely used and often crucial for the operation of particle accelerators as well as experimental beamlines. The AWAKE experiment, currently under construction at CERN, requires a detailed understanding of screen sensitivity and the associated accuracy of the beam size measurement. We present the measurement of relative light yield and screen resolution of seven different materials (Chromox, YAG, Alumina, Titanium, Aluminium, Aluminium and Silver coated Silicon). The Chromox and YAG samples were additionally measured with different thicknesses. The measurements were performed at the CERN's HiRadMat test facility with 440 GeV/c protons, a beam similar to the one foreseen for AWAKE. The experiment was performed in an air environment.  
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MOPG79 Scintillating Screens Investigations with Proton Beams at 30 keV and 3 MeV 273
 
  • C. Simon, F. Harrault, F. Senée, O. Tuske
    CEA/DSM/IRFU, France
  • P. Ausset
    IPN, Orsay, France
  • E. Bordas, F. Leprêtre, Y. Serruys
    CEA, Gif-sur-Yvette, France
  • J. Fils
    GSI, Darmstadt, Germany
 
  Luminescent screens hit by accelerated charged particle beams are commonly used as beam diagnostics to produce a visible emitted light, which can be sensed by a camera. In order to investigate the characteristics of the luminescence response of several scintillators, the beam shape and the observation of the transverse position, experiments were done with different low intensity proton beams produced by two different test benches. This study is motivated by the need to identify scintilla-tor materials for the development of a 4-dimensional emittancemeter which will allow the characterization of the beams, in particular the emittance measurement (size, angular divergence). This paper describes the experimental setups and our investigations of the optical properties of various scintillating materials at two different proton beam energies respectively about 30 keV and 3 MeV. The light produced by these screens is characterized by yield, flux of the emitted light versus the beam intensity, time response, and long life-time and they are compared.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG79  
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TUPG65 OTR Measurements with Sub-MeV Electrons 501
 
  • V.A. Verzilov, P.E. Dirksen
    TRIUMF, Canada's National Laboratory for Particle and Nuclear Physics, Vancouver, Canada
 
  It is a quite common belief that measurements of Optical Transition Radiation (OTR) produced by sub-MeV electron beams are impossible or at least require special highly sensitive instrumentation. The TRIUMF electron linac, presently undergoing commissioning, is capable of delivering up to 10mA of CW electron beams. Simulations showed that such a powerful beam generates substantial amount of light even at electron energies available at the output of the thermionic gun. The experiment was then setup to test the predictions. This paper reports OTR measurements for the range of electron energies 100-300 keV performed with an ordinary CCD camera.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG65  
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TUPG66 High-Energy X-Ray Pinhole Camera for High-Resolution Electron Beam Size Measurements 504
 
  • B.X. Yang, S.H. Lee, J.W. Morgan, H. Shang
    ANL, Argonne, Illinois, USA
 
  Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
The Advanced Photon Source (APS) is developing the design of a multi-bend achromat (MBA) lattice based storage ring as the next major upgrade, featuring a 20-fold reduction in emittance. Combining the reduction of beta functions, the electron beam sizes at bend magnet sources may be reduced to reach 5 - 10 μm for 10% vertical coupling. The x-ray pinhole camera currently used for beam size monitoring will not be adequate for the new task. By increasing the operating photon energy to 120 keV or higher, the pinhole camera's resolution is expected to reach below 4 μm. The peak height of the pinhole image will be used to monitor relative changes of the beam sizes and enable the feedback control of the emittance. We present the computer simulation and the design of a prototype beam size monitor for the APS storage ring.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG66  
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TUPG67 Recent Results From New Station for Optical Observation of Electron Beam Parameters at KCSR Storage Ring 508
 
  • O.I. Meshkov, V.M. Borin, A.D. Khilchenko, A.I. Kotelnikov, A.N. Kvashnin, L.M. Schegolev, A.N. Zhuravlev, E.I. Zinin, P.V. Zubarev
    BINP SB RAS, Novosibirsk, Russia
  • V.L. Dorokhov
    BINP, Novosibirsk, Russia
  • V. Korchuganov, G. Kovachev, D.G. Odintsov, A.I. Stirin, Yu.F. Tarasov, A.G. Valentinov, A.V. Zabelin
    NRC, Moscow, Russia
 
  New station for optical observation of electron beam parameters is being designed at KCSR SIBERIA-2 storage ring in collaboration with Budker Institute of Nuclear Physics, Novosibirsk, Russia. For the purpose of easy operation, control and alignment, the new station is located outside the shielding wall of the storage ring. The station serves for the automatic measurement of electron bunches transverse and longitudinal sizes with the use of SR visible spectrum in one-bunch and multi-bunch modes; the study of individual electron bunches behavior in time with changing accelerator parameters; the precise measurement of betatron and synchrotron oscillations frequency. The station contains the set of diagnostics: double-slit interferometer, CCD camera, optical dissector, TV camera and two linear avalanche photodiodes arrays. New optical observation station meets the requirements of accelerator physics experiments and experiments with the use of SR related to the knowledge of exact parameters of separate electron bunches. The recent experimental results obtained with the diagnostics are described.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG67  
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TUPG68 Study of the Radiation Damage on a Scintillating Fibers Based Beam Profile Monitor 512
 
  • E. Rojatti, G.M.A. Calvi, L. Lanzavecchia, A. Parravicini, C. Viviani
    CNAO Foundation, Milan, Italy
 
  The Scintillating Fibers Harp (SFH) monitors are the beam profile detectors used in the High Energy Beam Transfer (HEBT) lines of the CNAO (Centro Nazionale Adroterapia Oncologica, Italy) machine. The use of scintillating fibers coupled with a high-resolution CCD camera makes the detector of simple architecture and with high performances (less than 0.5mm resolution and 50Hz frame rate); on the other hand, fibers radiation damage shall be faced after some years of operation. The damage appears in multiple ways, as efficiency loss in light production, delayed light emission, attenuation length reduction. The work presents measurements and analysis performed to understand the phenomenon, in such a way to deal with it as best as possible. The connection between dose rate, integral dose and damage level is investigated as well as the possible recovery after a period of no irradiation. The influence of the damage effects on profiles reconstruction and beam parameters calculation is studied. Data elaboration is modified in such a way to compensate radiation damage effects and protract the SFH lifetime, before the major intervention of fibers replacement. Methods and results are discussed.  
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TUPG70 Test of the Imaging Properties of Inorganic Scintillation Screens Using Fast and Slow Extracted Ion Beams 516
 
  • A. Lieberwirth, P. Forck, O.K. Kester, S. Lederer, T. Sieber, B. Walasek-Höhne
    GSI, Darmstadt, Germany
  • W. Ensinger, S. Lederer, A. Lieberwirth
    TU Darmstadt, Darmstadt, Germany
  • P. Forck, O.K. Kester
    IAP, Frankfurt am Main, Germany
 
  Funding: Work supported by BMBF, contract number 05P12RDRBJ
Inorganic scintillation screens are a common transverse profile diagnostics tool for beams extracted from the heavy ion synchrotron SIS18 at GSI. Detailed investigations concerning light output, profile reproduction and spectral emission were performed for phosphor screens P43 and P46, single crystal YAG:Ce, alumina ceramics and Chromium-doped alumina (Chromox). The screens were irradiated with several ion species from proton to Uranium. The particle energy was 300 MeV/u at intensities in the range from some 106 to 1010 particles per pulse, using either fast extraction (1μsecond duration) or slow extraction (some 100 ms duration). The light output coincides for both extraction types, i.e. no significant saturation was observed. For all materials the optical emission spectrum is independent on the ion species or beam intensities. Radiation hardness tests were performed with up to 1012 accumulated ions: The phosphor P46 as well as YAG:Ce shows no significant decrease of light output, while for P43 and Chromox a decrease by 5 to 15 % was measured. These results will trigger the choice of the standard screens installed at the FAIR facility.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG70  
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TUPG71 Ionization Profile Monitor Simulations - Status and Future Plans 520
 
  • M. Sapinski, P. Forck, T. Giacomini, R. Singh, S. Udrea, D.M. Vilsmeier
    GSI, Darmstadt, Germany
  • F. Belloni, J. Marroncle
    CEA/IRFU, Gif-sur-Yvette, France
  • B. Dehning, J.W. Storey
    CERN, Geneva, Switzerland
  • K. Satou
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • C.A. Thomas
    ESS, Lund, Sweden
  • R.M. Thurman-Keup
    Fermilab, Batavia, Illinois, USA
  • C.C. Wilcox, R.E. Williamson
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  Nonuniformities of the extraction fields, the velocity distribution of electrons from ionization processes and strong bunch fields are just a few of the effects affecting Ionization Profile Monitor measurements and operation. Careful analysis of these phenomena require specialized simulation programs. A handful of such codes has been written independently by various researchers over the recent years, showing an important demand for this type of study. In this paper we describe the available codes and discuss various approaches to Ionization Profile Monitor simulations. We propose benchmark conditions to compare these codes between themselves and we collect data from various devices to benchmark codes against the measurements. Finally we present a community effort with a goal to discuss the codes, exchange simulation results and to develop and maintain a new, common codebase.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG71  
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TUPG72 Calibration of X-ray Monitor during the Phase I of SuperKEKB commissioning 524
 
  • E. Mulyani
    Sokendai, Ibaraki, Japan
  • J.W. Flanagan
    KEK, Ibaraki, Japan
 
  X-ray monitors (XRM) have been installed in each SuperKEKB ring, the Low Energy Ring (LER) and High Energy Ring (HER), primarily for vertical beam size measurement. Both rings have been commissioned in Phase I of SuperKEKB operation (February-June 2016), and several XRM calibration studies have been carried out. The geometrical scale factors seems to be well understood for both LER and HER. The emittance knob ratio method yielded results consistent with expectations based on the machine model optics (vertical emittance εy is {§I{≈8}{pm}}). For the HER, the vertical emittance εy is {§I{≈41}{pm}}, which is 4× greater than the optics model expectation. Analysis of beam size and lifetime measurements suggests unexpectedly large point response functions, particularly in the HER.  
poster icon Poster TUPG72 [34.615 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG72  
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TUPG73 Preparatory Work for a Fluorescence Based Profile Monitor for an Electron Lens 528
 
  • S. Udrea, P. Forck
    GSI, Darmstadt, Germany
  • E. Barrios Diaz, O.R. Jones, P. Magagnin, G. Schneider, R. Veness
    CERN, Geneva, Switzerland
  • P. Forck, S. Udrea
    IAP, Frankfurt am Main, Germany
  • V. Tzoganis, C.P. Welsch, H.D. Zhang
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
 
  Electron lenses (e-lens) have been proposed and used to mitigate several issues related to beam dynamics in high current synchrotrons. A hollow electron lens system is presently under development as part of the collimation upgrade for the high luminosity up-grade of LHC. Moreover, at GSI an electron lens system also is proposed for space charge compensation in the SIS-18 synchrotron to decrease the tune spread and allow for the high intensities at the future FAIR facility. For effective operation, a very precise alignment is necessary between the ion beam and the low energy electron beam. For the e-lens at CERN a beam diagnostics setup based on an intersecting gas sheet and the observation of beam induced fluorescence (BIF) is under development within a collaboration between CERN, Cockcroft Institute and GSI. In this paper we give an account of recent preparatory experiments performed at the Cockcroft Institute's gas curtain experimental setup with the aim to find the optimum way of distinguishing between the signals due to the low energy electron beam and the relativistic proton beam.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG73  
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TUPG74 Spot Size Measurements in the ELI-NP Compton Gamma Source 532
 
  • F. Cioeta, E. Chiadroni, G. Di Pirro, G. Franzini, V. Shpakov, A. Stella, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • A. Cianchi
    INFN-Roma II, Roma, Italy
  • M. Marongiu
    INFN-Roma, Roma, Italy
  • A. Mostacci, L. Palumbo
    University of Rome La Sapienza, Rome, Italy
 
  A high brightness electron Linac is being built in the Compton Gamma Source at the ELI Nuclear Physics facility in Romania. To achieve the design luminosity, a train of 32, 16 ns spaced, bunches with a nominal charge of 250 pC will collide with the laser beam in the interaction point. Electron beam spot size is measured with an OTR (optical transition radiation) profile monitors. In order to measure the beam properties, the optical radiation detecting system must have the necessary accuracy and resolution. This paper deals with the studies of different optic configurations to achieve the magnification, resolution and accuracy desired considering design and technological constraints; we will compare several configurations of the optical detection line to justify the one chosen for the implementation in the Linac.  
poster icon Poster TUPG74 [44.049 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG74  
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TUPG75 Thermal Simulations for Optical Transition Radiation Screen for ELI-NP Compton Gamma Source 536
 
  • F. Cioeta, D. Alesini, A. Falone, V.L. Lollo, L. Pellegrino, A. Variola
    INFN/LNF, Frascati (Roma), Italy
  • M. Ciambrella, A. Mostacci, L. Palumbo
    University of Rome La Sapienza, Rome, Italy
  • M. Marongiu, V. Pettinacci
    INFN-Roma, Roma, Italy
 
  The Gamma Beam Source (ELI-GBS) is a high brightness electron LINAC that is being built at the ELI Nuclear Physics (ELI-NP) facility in Romania. The ELI-GBS aims to produce high quality gamma beam through Compton Backscattering. A train of 32 bunches at 100Hz with a nominal charge of 250pC is accelerated up to 740 MeV. Two interaction points with an IR Laser beam produces the gamma beam at two different energies. In order to measure the electron beam spot size and the beam properties, the LINAC is equipped with several optical transition radiation (OTR) profile monitors. Those OTR screens must sustain the thermal and mechanical stress due to the energy deposited by the bunches. We present a numerical (ANSYS) study of the thermo-mechanical issues due to beam energy deposition in the screens; our analysis will cover both the steady state and transient regime.  
poster icon Poster TUPG75 [41.161 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG75  
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TUPG76 Performance Studies of Industrial CCD Cameras Based on Signal-To-Noise and Photon Transfer Measurements 540
 
  • G. Kube
    DESY, Hamburg, Germany
 
  Taking advantage of the rapid development and the huge market for commercial available optical sensors, in the past years optical measuring techniques took on greater significance. Nowadays, area scan CCD or CMOS sensors are widely used for beam profile diagnostics. They provide the full two-dimensional information about the particle beam distribution, allowing in principle to investigate shot-to-shot profile fluctuations at moderate repetition rates. In order to study the performance and to characterize these cameras, photon transfer is a widely applied popular and valuable testing methodology. In this contribution, studies based on signal-to-noise and photon transfer measurements are presented for CCD cameras which are in use for beam profile diagnostics at different DESY accelerators.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG76  
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TUPG77 Experimental Results of a Compact Laserwire System for Non-Invasive H Beam Profile Measurements at CERN's Linac4 544
 
  • S.M. Gibson, G.E. Boorman, A. Bosco
    Royal Holloway, University of London, Surrey, United Kingdom
  • T. Hofmann, U. Raich, F. Roncarolo
    CERN, Geneva, Switzerland
 
  Funding: Support from UK STFC, grant ST/N001753/1.
A non-invasive laserwire system is being developed for quasi-continuous monitoring of the transverse profile and emittance of the final 160 MeV beam at CERN's LINAC4. As part of these developments, a compact laser-based profile monitor was recently tested during LINAC4 commissioning at beam energies of 50 MeV, 80 MeV and 107 MeV. A laser with a tunable pulse width (1-300 ns) and ~200 W peak power in a surface hutch delivers light via a 75 m LMA transport fibre to the accelerator. Automated scanning optics deliver a free space <150 micron width laserwire to the interaction chamber, where a transverse slice of the hydrogen ion beam is neutralised via photo-detachment. The liberated electrons are deflected by a low field dipole and captured by a sCVD diamond detector, that can be scanned in synchronisation with the laserwire position. The laserwire profile of the LINAC4 beam has been measured at all commissioning energies and is found in very good agreement with interpolated profiles from conventional SEM-grid and wire scanner measurements, positioned up and downstream of the laserwire setup. Improvements based on these prototype tests for the design of the final system are presented.
 
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG77  
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TUPG79 LANSCE Isotope Production Facility Emittance Measurement System 548
 
  • J.D. Sedillo, D. Baros, J.F. O'Hara, L. Rybarcyk, R.A. Valicenti, H.A. Watkins
    LANL, Los Alamos, New Mexico, USA
 
  A new beam diagnostic system for emittance measurement is under development for the Isotope Production Facility (IPF) beamline located at the Los Alamos Neutron Science Center (LANSCE). This system consists of two axes; each composed of a harp and slit actuation system for measuring the emittance of 41, 72, and 100-MeV proton beam energies. System design details and project status will be discussed with installation and commissioning of this system scheduled to conclude by February 2017.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG79  
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TUPG80 Design and Implementation of Non-Invasive Profile Monitors for the ESS LEBT 551
 
  • C.A. Thomas, T. Galh, T.J. Grandsaert, H. Kocevar, J.H. Lee, A. Serrano, T.J. Shea
    ESS, Lund, Sweden
 
  We present in this paper the design and implementation of the Non-invasive Profile Monitors for the ESS LEBT. Non-invasive Profile Monitors at ESS measure the transverse profile of the high power proton beam. As such the NPM for the LEBT is not different from NPM designed for other sections of the ESS linac, however, it received the requirement to measure the position of the beam accurately with respect to the centre of the vacuum chamber, representing the reference orbit. This particular requirement led to implement a specific design to provide absolute position measurement to the system. In the following we will first describe the design and the associated functionalities, and then we will present the performance measurements of this built system, fully integrated into the control system. Finally we will discuss the performance in comparison to the initial requirements.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG80  
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TUPG81 Space Charge Studies for the Ionisation Profile Monitors for the ESS Cold Linac 555
 
  • C.A. Thomas
    ESS, Lund, Sweden
  • F. Belloni, J. Marroncle
    CEA/IRFU, Gif-sur-Yvette, France
 
  In this paper, we present the results from a numerical code developed to study the effect of space charge on the performance of Ionisation Profile Monitors. The code has been developed from the analytical expression of the electromagnetic field generated by a 3D bunch of charged particles moving along one axis. This transient field is evaluated to calculate the momentum gained by a test moving particle, but not necessary co-moving with the bunch, and included in a non-linear ordinary differential equation solver (Runge-Kutta) to track the 3D motion of the test particle. The model of the IPM is complete when an additional constant electric field is included to project the test particle onto a screen. The results from this code, modelling the IPM to be developed for the ESS Cold Linac, are presented here, and the impact of the space charge on the measurement of the beam profile is discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG81  
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TUPG82 Preliminary Measurement on Potential Luminescent Coating Material for the ESS Target Imaging Systems 559
 
  • C.A. Thomas, M.A. Hartl, Y. Lee, T.J. Shea
    ESS, Lund, Sweden
  • E. Adli, H. Gjersdal, M.R. Jaekel, O. Rohne
    University of Oslo, Oslo, Norway
  • S. Joshi
    University College West, Trollhätan, Sweden
 
  We present in this paper the preliminary measurements performed on luminescent materials to be investigated and eventually coated on the ESS target wheel, the Proton Beam Window separating the end of the ESS Linac and the entrance of the ESS target area, and the ESS Dump. Among all the properties of the luminescent material required for the target imaging systems, luminescence yield and luminescent lifetime are essential for two reasons. The first one is trivial, since this material is the source for the imaging system and sets its potential performance. The lifetime is not generally of importance, unless the object is moving, or time dependence measurements are to be done. In our case, the target wheel is moving, and measurement of the beam density current may have to be performed at the 10μups scale. Thus luminescence lifetime of the coating material should be known and measured. In this paper, we present the luminescence measurements of the photo-luminescent lifetime of several materials currently under studies to be used eventually for the first beam on target.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG82  
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WEBL02 Beam Size Measurements Using Interferometry at LHC 583
 
  • G. Trad, E. Bravin, A. Goldblatt, S. Mazzoni, F. Roncarolo
    CERN, Geneva, Switzerland
  • T.M. Mitsuhashi
    KEK, Ibaraki, Japan
 
  During the long LHC shutdown 2013-2014, both the LHC and its injector chain underwent significant upgrades. The most important changes concerned increasing the maximum LHC beam energy from 4TeV to 6.5TeV and reducing the transverse emittance of the beam from the LHC injectors. These upgrades pose challenges to the measurement of the transverse beam size via Synchrotron Radiation (SR) imaging, as the radiation parameters approach the diffraction limit. Optical SR interferometry, widely used in synchrotron light facilities, was considered as an alternative method to measure the 150 'm rms beam size at top energy as it allows measurements below the diffraction limit. A system based on this technique was therefore implemented in the LHC, for the first time on a proton machine. This paper describes the design of the LHC interferometer and its two SR sources (a superconducting undulator at low energy and a bending dipole at high energy), along with the expected performance in terms of beam size measurement as compared to the imaging system. The world's first proton beam interferogram measured at the LHC will be shown and plans to make this an operational monitor will be presented.  
slides icon Slides WEBL02 [42.662 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL02  
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WEBL03 Beam Shape Reconstruction Using Synchrotron Radiation Interferometry 589
 
  • L. Torino, U. Iriso
    ALBA-CELLS Synchrotron, Cerdanyola del Vallès, Spain
 
  Synchrotron Radiation Interferometry (SRI) through a double-aperture system is a well known technique to measure the transverse beam size using visible light. In many machines the beam is tilted in the transverse plane, but the SRI technique only allows to directly measure the size of the projection of the beam shape along the axis connecting the two apertures. A method to fully reconstruct the beam in the transverse plane using SRI has been developed and successfully tested at the ALBA synchrotron light source. This report shows the full beam reconstruction technique and presents the results at ALBA. Moreover, we also discuss how this technique could improve the measurement of very small beam sizes, improving the resolution of standard SRI.  
slides icon Slides WEBL03 [20.443 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL03  
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WEBL04 The New Optical Device for Turn to Turn Beam Profile Measurement 593
 
  • V.L. Dorokhov
    BINP, Novosibirsk, Russia
  • A.D. Khilchenko, A.I. Kotelnikov, A.N. Kvashnin, O.I. Meshkov, P.V. Zubarev
    BINP SB RAS, Novosibirsk, Russia
  • V. Korchuganov, A.I. Stirin, A.G. Valentinov
    NRC, Moscow, Russia
 
  The electron beam quality determines the main synchrotron radiation characteristics therefore beam diagnostics is of great importance for synchrotron radiation source performance. The real-time processing of the electron beam parameters is a necessary procedure to optimize the key characteristics of the source using feedback loops. The frequency of electron beam cycling in the synchrotron storage ring is about 1 MHz. In multi-bunch mode electrons are grouped into a series of bunches. The bunch repetition frequency depends on the total number of bunches and usually reaches hundreds of MHz. The actual problem is to study the separate bunch dimensions behavior under multi-bunch beam instabilities. To solve this problem a turn-to-turn electron beam profile monitor is developed for Siberia-2 synchrotron light source. The linear avalanche photodiodes array is applied to imaging. The apparatus is able to record a transversal profile of selected bunches and analyze the dynamics of beam during 106 turns. The recent experimental results obtained with the diagnostics are described.  
slides icon Slides WEBL04 [4.282 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL04  
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WEPG59 Thermal Simulations of Wire Profile Monitors in ISIS Extracted Proton Beamline 1 785
 
  • D.W. Posthuma de Boer, A. Pertica
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  Wire scanners and secondary emission (SEM) grids are used for measurements of transverse beam profile at the ISIS neutron and muon source. Silicon carbide-coated carbon fibre wires are used in profile monitors throughout the ISIS accelerator. One such SEM grid is currently installed close to the target in EPB2 and is intercepted by the 800 MeV proton beam at a repetition rate of 10 Hz. Future profile measurements will require another of these monitors to be installed close to the target in EPB1; intercepted with a repetition rate of 40 Hz. Wires intercepting the ion beam are heated due to the deposition of beam-energy. Thermal simulations for the higher repetition rate were performed using ANSYS and a numerical code. The numerical code was then expanded to include various beam, wire and material properties. Assumptions for temperature dependent material emissivities and heat capacities were included in the simulation. Estimated temperatures due to the energy deposited by protons, and approximate values of deposited energy from the expected neutron flux are presented. The effects on wire-temperature of various beam and wire parameters are also discussed.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG59  
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WEPG61 Theory of X-Ray Transition Radiation from Graphene for Transition Radiation Detectors 788
 
  • A.A. Tishchenko, A. Romaniouk, D.Yu. Sergeeva, M.N. Strikhanov
    MEPhI, Moscow, Russia
 
  We present the theory of transition radiation for monolayers in X-ray domain from the first principles and consider the pros and cons of using graphene-monolayer in transition radiation detectors.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG61  
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WEPG62 Incoherent and Coherent Polarization Radiation as Instrument of the Transversal Beam Size Diagnostics 792
 
  • D.Yu. Sergeeva, M.N. Strikhanov, A.A. Tishchenko
    MEPhI, Moscow, Russia
 
  Polarization radiation, which includes diffraction radiation (DR), transition radiation (TR), Smith-Purcell radiation, and others, can be a good instrument for beam diagnostics. All information about the beam size is contained in the so-called form-factor of the beam. The form-factor represents the sum of two parts corresponding to the coherent and incoherent radiation*. Contrary to the general opinion the incoherent part does not always equal unity*, **. In this report we give theoretical description of the incoherent and coherent parts of the form-factor both for Gaussian and uniform distribution of the ultrarelativistic particles in the bunch*, ***. The theory constructed describes also the case of beam skimming the target, which leads to mixing of DR and TR***. We show that the incoherent part depends on the transversal size of the beam, and dependence differs for different distributions. The role of the incoherent part of the form-factor of the bunch for different parameters is discussed.
* D.Yu. Sergeeva, A.A. Tishchenko et al., NIM B (2013)
** J.H. Brownell et al., PRE (1998); G. Doucas et al., PR STAB (2002)
*** A.A. Tishchenko, D.Yu. Sergeeva et al., Vacuum (2016)
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG62  
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WEPG63 Performance Evaluation of Molybdenum Blades in an X-ray Pinhole Camera 795
 
  • L.M. Bobb, A.F.D. Morgan, G. Rehm
    DLS, Oxfordshire, United Kingdom
 
  At Diamond Light Source transverse profile measurements of the 3 GeV electron beam are provided by x-ray pinhole cameras. From these beam size measurements and given knowledge of the lattice parameters the emittance, coupling and energy spread are calculated. Traditionally, tungsten blades are used to form the pinhole aperture due to the opacity of tungsten to x-rays in the keV spectral range. The physical properties of tungsten also make it difficult to work. To achieve the 25 micron x 25 micron aperture size required for high resolution measurements it is necessary to mount these tungsten blades in an assembly whereby the pinhole aperture size is defined by precisely machined shims. Here we propose to replace the tungsten blade and shim arrangement with machined molybdenum blades and evaluate the performance of the resulting imaging system.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG63  
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WEPG66 Beam Induced Fluorescence Monitor R&D for the J-PARC Neutrino Beamline 799
 
  • M.L. Friend
    KEK, Ibaraki, Japan
  • C. Bronner, M. Hartz
    Kavli IPMU, Kashiwa, Japan
 
  Proton beam monitoring is essential for the J-PARC neutrino beamline, where neutrinos are produced by the collision of 30 GeV protons with a long carbon target. Along with continued upgrades to the J-PARC beam power, from the current 420 kW to 1.3+ MW, there is also a requirement for monitor upgrades. A Beam Induced Fluorescence monitor is under development, which would continuously and non-destructively measure the proton beam profile spill-by-spill by measuring fluorescence light from proton interactions with gas injected into the beamline. Monitor design is constrained by the J-PARC neutrino beamline configuration, where a major challenge will be getting sufficient signal to precisely reconstruct the proton beam profile. R&D for a pulsed gas injection system is under way, where injected gas uniformity and vacuum pump lifetime are main concerns. Design of a light detection system is also under way, where light transport away from the high radiation environment near the proton beamline, as well as fast detection down to very low light levels, are essential.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG66  
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WEPG67 Non-Invasive Beam Profile Measurement for High Intensity Electron Beams 803
 
  • T. Weilbach, K. Aulenbacher, M.W. Bruker
    HIM, Mainz, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
 
  Beam profile measurements of high intensity electron beams below 10 MeV, e.g. in energy recovery linacs or magnetized high energy electron coolers, have to fulfill special demands. Commonly used diagnostic tools like synchrotron radiation and scintillation screens are ineffective or not able to withstand the beam power without being damaged. Non-invasive methods with comparable resolution are needed. Hence, a beam profile measurement system based on beam-induced fluorescence (BIF) was built. This quite simple system images the light generated by the interaction of the beam with the residual gas onto a PMT. A more elaborated system, the Thomson Laser Scanner (TLS) - the non-relativistic version of the Laser Wire Scanner - is proposed as a method for non-invasive measurement of all phase space components, especially in the injector and merger parts of an ERL. Since this measurement suffers from low count rates, special attention has to be given to the background. Beam profile measurements with the BIF system will be presented as well as a comparison with YAG screen measurements. The recent status of the TLS system will be presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG67  
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WEPG68 An Investigation into the Behaviour of Residual Gas Ionisation Profile Monitors in the ISIS Extracted Beamline 807
 
  • C.C. Wilcox, B. Jones, A. Pertica, R.E. Williamson
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
 
  Non-destructive beam profile measurements at the ISIS neutron source are performed using Multi-Channel Profile Monitors (MCPMs). These use residual gas ionisation within the beam pipe, with the ions being guided to an array of 40 Channeltron electron multipliers by a high voltage drift field. Non-uniform transverse electric fields within these monitors are caused by the drift field and the beam's space charge. Longitudinally, a saddle point located between the drift field plate and the opposing compensating field plate introduces extra complexity into the ion motion. To allow for detailed studies of this behaviour, an MCPM has been placed in Extracted Proton Beamline 1 (EPB1) where the beam is well defined. Simulations of the profiles obtained by this monitor are performed using machine measurements, CST EM Studio and a simple C++ particle tracking code. This paper describes the process used to simulate MCPM profiles along with a comparison of simulated and measured results. Trajectories of detected ions from their creation to the Channeltrons are discussed, together with a study of Channeltron detection characteristics carried out in the ISIS diagnostics laboratory vacuum tank.  
poster icon Poster WEPG68 [2.703 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG68  
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WEPG69 Profile Measurement by the Ionization Profile Monitor with 0.2T Magnet System in J-PARC MR 811
 
  • K. Satou, H. Kuboki, T. Toyama
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
 
  A nondestructive Ionization Profile Monitor (IPM) is widely used to measure transversal profile. At J-PARC Main Ring (MR), three IPM systems have been used not only to measure emittances but also to correct injection miss matchings. To measure injection 3GeV beam profiles, the high external E field of +50kV/130mm at the maximum is used to guide ionized positive ions to a position sensitive detector; transversal kick force originating from space charge E field of circulating beam is a main error source which deteriorates profile. The strong B field is also used to compensate the kick force. To measure 30GeV bunched beam at the flat top on the fast extraction mode in good resolution, the strong B field of about 0.2T is needed. One set of magnet system, which consists of a C-type and two H-type magnets, were developed and installed in one IPM system. The IPM chamber was inserted between the 2 poles of the C-type magnet. To make the line integral of B field along the beam axis zero, the H-type magnets have the opposite field polarity to that of the C-type magnet and were installed on both sides of the C-type magnet. Details of the magnet system and its first trials will be presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG69  
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WEPG71 3D Density Scans of a Supersonic Gas Jet for Beam Profile Monitoring 815
 
  • H.D. Zhang, V. Tzoganis, C.P. Welsch, W. Widmann
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • V. Tzoganis, C.P. Welsch, W. Widmann, H.D. Zhang
    The University of Liverpool, Liverpool, United Kingdom
 
  Funding: STFC Cockcroft and EU under GA 215080.
A beam profile monitor based on a supersonic gas jet was successfully tested at the Cockcroft Institute. This monitor can be used for a large variety of beams over a large energy range, including high intensity/high energy beams with large destructive power which make the use of many commonly used diagnostics impossible, and beams with a short life time which require minimum interference of the diagnostics. The achievable resolution of this type of monitor depends on the jet thickness and homogeneity. Detailed knowledge of the jet density profile is hence of high importance. In this contribution we present how a moveable vacuum gauge was successfully used to investigate the 3D density distribution of the jet. We compare the experimental data to results from simulations and discuss how the findings can help further improve of the overall jet design.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG71  
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WEPG73 A Hardware and Software Overview on the New BTF Transverse Profile Monitor 818
 
  • B. Buonomo, D.G.C. Di Giulio, L.G. Foggetta
    INFN/LNF, Frascati (Roma), Italy
  • P. Valente
    INFN-Roma, Roma, Italy
 
  Funding: Supported by the H2020 project AIDA-2020, GA no. 654168
In the last 11 years, the Beam-Test Facility (BTF) of the DAΦNE accelerator complex, in the Frascati laboratory, has gained an important role in the EU infrastructures devoted to the development of particle detectors. The facility can provide runtime tuneable electrons and positrons beams in a range of different parameters: energy (up to 750 MeV for e- and 540 MeV for e+), charge ( up to 1010 e /bunch) and pulse length (1.4-40 ns). The bunch delivering rate is up to 49 Hz and the beam spot and divergence can be adjusted, down to sub-mm sizes and 2 mrad, in order to achieve user needs. In these paper we are going to describe the new implementation of the secondary BTF beam transverse monitor systems based on WIDEPIX FITPIX detectors, operating in bus synchronization mode externally timed to BTF beams. Our software layout includes a data producer, a live-data display consumer and a MEMCACHED caching server. This configuration offers to BTF users a vary fast approach to the transverse data using TCP/IP calls to MEMCACHED with an easy and fast software integration on users DAQ. The data packing permits also to avoid the needs of mixed (user vs BTF) hardware synchronization.
 
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG73  
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WEPG74 Bridging the Gap; Updating LANSCE Digitizers 822
 
  • D. Baros, J.D. Sedillo, H.A. Watkins
    LANL, Los Alamos, New Mexico, USA
 
  Funding: Work supported by the U.S. Department of Energy.
The Los Alamos Neutron Science Center (LANSCE) is currently upgrading equipment that is used to digitize transverse beam profile measurements. Emittance measurements were originally digitized using legacy equipment, known as RICE (Remote Indication and Control Equipment). This required 38 RICE modules distributed along the half-mile long accelerator simultaneously recording 4 channels each to populate the 76 data points needed to create a single emittance profile. The system now uses a National Instruments cRIO controller to digitize the entire profile in a single chassis. Details of the hardware selection and performance of the system for different timing structures are presented.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG74  
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WEPG75 The Beam Profile Monitoring System for the CERN IRRAD Proton Facility 825
 
  • F. Ravotti, B. Gkotse, M. Glaser, E. Matli, G. Pezzullo
    CERN, Geneva, Switzerland
  • K.K. Gan, H. Kagan, S. Smith, J.D. Warner
    Ohio State University, Columbus, Ohio, USA
 
  Funding: Project funded by AIDA project and the EU H2020 Research and Innovation programme, GA n. 654168.
In High Energy Physics (HEP) experiments, devices are required to withstand high radiation levels. As a result, detectors and electronics sitting in the inner detector layers must be irradiated to determine their radiation tolerance. To perform these irradiations, CERN built during LS1 a new irradiation facility in the East Area at the Proton Synchrotron (PS) accelerator. At this facility, named IRRAD, a high-intensity 24 GeV/c proton beam is used. During beam steering and irradiation, the intensity and the transverse profile of the proton beam are monitored online. The IRRAD Beam Profile Monitor (BPM) uses a set of four 39-channel pixel detectors constructed using thin foil copper pads positioned on a flex circuit. When protons pass through the copper pads, they induce a measurable current. To measure this current a new data acquisition system was designed as well as a new database and on-line display system. In this work, we present the design and the architecture of the IRRAD BPM system, some results on its performance with the proton beam, as well as its planned upgrades, including its utilization for monitoring irradiations with an intense 300MeV/c positive pion beam at PSI.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG75  
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WEPG76 Status of the Two-Dimensional Synchrotron Radiation Interferometer at PETRA III 829
 
  • A.I. Novokshonov, A. Potylitsyn
    TPU, Tomsk, Russia
  • G. Kube, M. Pelzer, G. Priebe
    DESY, Hamburg, Germany
 
  Synchrotron radiation based emittance diagnostics at modern 3rd generation light sources is mainly based on beam profile imaging in the X-ray region in order to overcome the resolution limit imposed by diffraction. A possibility to circumvent this limitation is to probe the spatial coherence with a double-slit interferometer in the optical spectral region [*]. The light source PETRA III at DESY is using this type of interferometer since several years in order to resolve vertical emittances of about 10 pm.rad. The device is set up behind a 30m long optical beamline, connecting the accelerator tunnel and the optical hutch. In order to increase the measurement stability, a much shorter optical beamline with reduced number of optical elements was recently commissioned. At the end of the beamline, a two-dimensional interferometer was installed which allows to deduce transverse emittances in both planes simultaneously. This contribution summarizes the status of beamline and interferometer commissioning together with model calculations in order to investigate systematically the measurement accuracy.
*T. Mitsuhashi, "Twelve Years of SR Monitor Development", 2004 Beam Instrumentation Workshop, 2014, pp. 5-11.
 
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG76  
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WEPG80 Optical Effects in High Resolution and High Dynamic Range Beam Imaging Systems 844
 
  • J. Wolfenden, R.B. Fiorito, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • M. Bergamaschi, R. Kieffer, T. Lefèvre, S. Mazzoni
    CERN, Geneva, Switzerland
  • P. Karataev, K.O. Kruchinin
    JAI, Egham, Surrey, United Kingdom
 
  Optical systems are used to transfer light in beam diagnostics for a variety of imaging applications. The effect of the point spread function (PSF) of these optical systems on the resulting measurements is often approximated or misunderstood. It is imperative that the optical PSF is independently characterised, as this can severely impede the attainable resolution of a diagnostic measurement. A high quality laser and specially chosen optics have been used to generate an intense optical point source in order to accomplish such a characterisation. The point source was used to measure the PSFs of various electron-beam imaging systems. These systems incorporate a digital micro-mirror array, which was used to produce very high (>105) dynamic range images. The PSF was measured at each intermediary image plane of the optical system; enabling the origin of any perturbations to the PSF to be isolated and potentially mitigated. One of the characterised systems has been used for optical transition radiation (OTR) measurements of an electron beam at KEK-ATF2 (Tsukuba, Japan).  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG80  
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THAL03 Multi-Laser-Wire Diagnostic for the Beam Profile Measurement of a Negative Hydrogen Ion Beam in the J-PARC LINAC 856
 
  • A. Miura, K. Okabe, M. Yoshimoto
    JAEA/J-PARC, Tokai-mura, Japan
  • I. Yamane
    KEK, Ibaraki, Japan
 
  In the J-PARC linac, the negative hydrogen ion beam is acceralated to be 400 MeV. Repitition rate will be increased to be from 25 Hz to 50 Hz. The half of 400 MeV beams are injected to the downstream scynchlotoron (RCS) and the other half will be transported to the planned experimental laboratory of the accelerator driven transmutation facility. One of the important issues for the high-current and high-brilliance accelerators is to understand the beam dynamics. The wire scanner monitor is reliably operated in many accelerator facilities around the world. Because the heat loading on a wire is getting increaced in high-current beam tuning, we focused to use a laser wire system. Ionization potential of the negative hydrogen ion is 0.75 eV and one electron is easily detached by a laser beam whose wavelength is adjusted by the Doppler-shift to a large cross-section point. In addition, we propose to use a new multi-laser-wire system. In the new system, we use a pair of concave millors with different diameters to make multi-paths of laser beam, and the beam waists of the laser paths are aligned in principle. In the paper, we propose the multi-laser-wire system and its application.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-THAL03  
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