Keyword: ion
Paper Title Other Keywords Page
MOPG08 Beam Position Monitors for LEReC electron, electronics, pick-up, instrumentation 47
  • Z. Sorrell, P. Cerniglia, R.L. Hulsart, K. Mernick, R.J. Michnoff
    BNL, Upton, Long Island, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LL C under Contract No. DE-AC02-98CH10886 with the U.S. Dept. of Energy
The operating parameters for Brookhaven National Laboratory's Low Energy RHIC Electron Cooling (LEReC) project create a unique challenge. To ensure proper beam trajectories for cooling, the relative position between the electron and the ion beam needs to be known to within 50μm. In addition, time of flight needs to be provided for electron beam energy measurement. Various issues have become apparent as testing has progressed, such as mismatches in cable impedance and drifts due to temperature sensitivity. This paper will explore the difficulties related to achieving the level of accuracy required for this system, as well as the potential solutions for these problems.
poster icon Poster MOPG08 [3.304 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG08  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
MOPG29 Beam Diagnostics Design for a Compact Superconducting Cyclotron for Radioisotope Production cyclotron, diagnostics, operation, ion-source 108
  • R. Varela, P. Abramian, J. Calero, P. Calvo, M.A. Domínguez, E.F. Estévez, L. García-Tabarés, D. Gavela, P. Gómez, A. Guirao, J.L. Gutiérrez, J.I. Lagares, D. López, L.M. Martínez, D. Obradors-Campos, C. Oliver, J.M. Pérez Morales, I. Podadera, F. Toral, C. Vázquez
    CIEMAT, Madrid, Spain
  Funding: Work supported by the Spanish Ministry of Economy and Competitiveness, project FIS2013-40860-R.
The aim of the AMIT cyclotron is to deliver an 8.5 MeV, 10 μA CW proton beam to a target to produce radioisotopes for PET diagnostics. Such a small cyclotron poses some challenges to the diagnostics design due to its small size. Two sets of diagnostics have been designed, each one aiming at a different phase of the machine lifecycle. During normal operation the stripping foil and the target will be used to measure the current, a dual transverse profile monitor based on a scintillating screen and a Fluorescence Profile Monitor will measure the beam position and the transverse profile. During first stages of commissioning the dual transverse profile monitor and the target will be substituted by an emittance monitor based on a pepperpot. A movable interceptive Beam Probe will be located inside the cyclotron to give information about the beam during acceleration. Additionally, a test bench for the characterization of the beam right after the exit of the ion source has been built with different instruments to measure the beam current and the transverse profile. In this paper the present status of the design, simulation and tests of the diagnostics for the AMIT cyclotron are described.
poster icon Poster MOPG29 [2.660 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG29  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
MOPG33 Design of RISP RFQ Cooler Buncher emittance, rfq, extraction, injection 115
  • R. Boussaid, S.A. Kondrashev, Y.H. Park
    IBS, Daejeon, Republic of Korea
  Under RISP project, wide variety of intense rare isotope ion beams will be provided. An EBIS charge breeder has been designed to charge breed these beams. Its optimum operation requires injection of bunched beam with high quality. An RFQ cooler buncher RFQCB is designed to meet these requirements. To meet the EBIS beam requirements, RFQCB should efficiently accept high intensity continuous beams and deliver to the EBIS bunched beams with small emittance (3 '.mm.mrad), low energy spread (< 10 eV) and short bunch width (2-10 μs). A new design concept to be implemented in this RFQCB have been developed, including a novel injection/extraction electrodes geometry, new RF voltages with frequency up to 10 MHz and amplitude up to 10 kV with improved differential pumping system. Simulations have shown the efficient handling of beam intensities which were never handled so far with improved beam quality. An overview of the RFQCB design concept will be presented. Simulated performance of the device and design of different sub-systems will be discussed. Beam parameters will be measured using Faraday cups and emittance meter. The design of these diagnostics tools will be described as well.  
poster icon Poster MOPG33 [1.931 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG33  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
MOPG42 Test Results from the Atlas Hybrid Particle Detector Prototype detector, electron, radiation, cathode 147
  • C. Dickerson, B. DiGiovine, L.Y. Lin
    ANL, Argonne, Illinois, USA
  • D. Santiago-Gonzalez
    LSU, Baton Rouge, USA
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
At the Argonne Tandem Linear Accelerator System (ATLAS) we designed and built a hybrid particle detector consisting of a gas ionization chamber followed by an inorganic scintillator. This detector will aid the tuning of low intensity beam constituents, typically radioactive, with relatively high intensity (>100x) contaminants. These conditions are regularly encountered during radioactive ion beam production via the in-flight method, or when charge breeding fission fragments from the CAlifornium Rare Isotope Breeder Upgrade (CARIBU). The detector was designed to have an energy resolution of ~5% at a rate of 105 particles per second (pps), to generate energy loss and residual energy signals for the identification of both Z and A, to be compact (retractable from the beamline), and to be radiation hard. The combination of a gas ionization chamber and scintillator will enable the detector to be very versatile and be useful for a wide range of masses and energies. Design details and testing results from the prototype detector are presented in this paper.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG42  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
MOPG76 A Scintillating Fibre Beam Profile Monitor for the Experimental Areas of the SPS at CERN detector, photon, radiation, proton 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.  
poster icon Poster MOPG76 [2.611 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG76  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
MOPG79 Scintillating Screens Investigations with Proton Beams at 30 keV and 3 MeV proton, ion-source, diagnostics, electron 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUPG27 Beam Diagnostics for Medical Accelerators proton, detector, diagnostics, network 387
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  Funding: This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska Curie grant agreement No 675265.
The Optimization of Medical Accelerators (OMA) is the aim of a new European Training Network that has received 4 ME of funding within the Horizon 2020 Programme of the European Union. OMA joins universities, research centers and clinical facilities with industry partners to address the challenges in treatment facility design and optimization, numerical simulations for the development of advanced treatment schemes, and beam imaging and treatment monitoring. This contribution presents an overview of the network's research into beam diagnostics and imaging. This includes investigations into applying detector technologies originally developed for high energy physics experiments (such as VELO, Medipix) for medical applications; integration of prompt gamma cameras in the clinical workflow; identification of optimum detector configurations and materials for high resolution spectrometers for proton therapy and radiography; ultra-low charge beam current monitors and diagnostics for cell studies using proton beams. It also summarizes the network-wide training program consisting of Schools, Topical Workshops and Conferences that will be open to the wider medical and accelerator communities.
poster icon Poster TUPG27 [0.388 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG27  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUPG28 Accelerator Optimization Through Beam Diagnostics cavity, network, diagnostics, beam-diagnostic 391
  • C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  Funding: This project has received funding from the European Union's Seventh Framework Programme for research, technological development and demonstration under grant agreement no 289485.
A comprehensive set of beam diagnostics is key to the successful operation and optimization of essentially any accelerator. The oPAC project received 6 M€ of funding within the EU's 7th Framework Programme. This has allowed to successfully train 23 Fellows since 2011. The network joins more than 40 institutions from all around the world, including research centers, universities and private companies. One of the project's largest work packages covers research in beam diagnostics. This includes advanced instrumentation for synchrotron light sources and medical accelerators, enhanced beam loss monitoring technologies, ultra-low emittance beam size diagnostics, diagnostics for high intensity beams, as well as the development of electronics for beam position monitors. This contribution presents an overview of the research outcomes from the diagnostics work package and the demonstrated performance of each monitor. It also shows how collaborative research helps achieving beyond state-of-the-art solutions and acts as an ideal basis for researcher training. Finally, an overview of the scientific events the network has been organizing for the wider accelerator community is given.
poster icon Poster TUPG28 [0.429 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG28  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUPG31 The Alignment of Convergent Beamlines at a New Triple Ion Beam Facility target, experiment, laser, alignment 403
  • O.F. Toader, T. Kubley, F.U. Naab, E.E. Uberseder
    NERS-UM, Ann Arbor, Michigan, USA
  The Michigan Ion Beam Laboratory (MIBL) at the University of Michigan in Ann Arbor Michigan, USA, has recently upgraded its capabilities from a two accelerator to a three accelerator operation mode. The laboratory, equipped with a 3 MV Tandem, a 400 kV Ion Implanter and a 1.7 MV Tandem has also increased the number of available beamlines from three to seven with two more in the planning stages. The MIBL staff had to overcome multiple challenges during the physical alignment process of the accelerators, beamlines and experimental end-stages. Not only the position of the accelerators changed, but the target chambers were moved into a different room behind a 1 m thick concrete wall. At the same time, one beamline from each accelerator had to converge and connect to a single chamber at a precise angle. This setup allows researchers to conduct simultaneous dual and triple ion beam experiments. This work presents the details of building this new setup, with focus on the alignment process.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG31  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUPG35 LEReC Instrumentation Design & Construction electron, gun, injection, emittance 417
  • T.A. Miller, M. Blaskiewicz, K.A. Drees, A.V. Fedotov, W. Fischer, J.M. Fite, D.M. Gassner, R.L. Hulsart, D. Kayran, J. Kewisch, C. Liu, K. Mernick, R.J. Michnoff, M.G. Minty, C. Montag, P. Oddo, M.C. Paniccia, I. Pinayev, S. Seletskiy, K.S. Smith, Z. Sorrell, P. Thieberger, J.E. Tuozzolo, D. Weiss, A. Zaltsman
    BNL, Upton, Long Island, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
RHIC will be run at low ion beam center-of-mass energies of 7.7 - 20 GeV/nucleon, much lower than the typical operations at 100 GeV/nucleon. The primary motivation is to explore the existence and location of the critical point on the QCD phase diagram. An electron accelerator is being constructed to provide Low Energy RHIC electron Cooling (LEReC) to cool both the blue & yellow RHIC ion beams by co-propagating a 10 - 50 mA electron beam of 1.6 - 2.6 MeV. This cooling facility will include a 400 keV DC gun, SRF booster cavity and a beam transport with multiple phase adjusting RF cavities to bring the beam to one ring to allow electron-ion co-propagation for ~21 m, then through a 180° U-turn electron transport so that the same electron beam can similarly cool the other counter-rotating ion beam, and finally to a beam dump. The injector commissioning is planned to start in early 2017 and full LEReC commissioning planned to start in early 2018. The instrumentation systems that will be described include current transformers, BPMs, profile monitors, multi-slit and single slit scanning emittance stations, time-of-flight and magnetic energy measurements, and beam halo & loss monitors.
poster icon Poster TUPG35 [14.455 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG35  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUPG50 Status of Beam Current Transformer Developments for FAIR extraction, operation, feedback, synchrotron 461
  • M. Schwickert, F. Kurian, H. Reeg, T. Sieber
    GSI, Darmstadt, Germany
  • K. Hofmann
    TU Darmstadt, Darmstadt, Germany
  • F. Kurian
    HIJ, Jena, Germany
  • R. Neubert, P. Seidel
    FSU Jena, Jena, Germany
  • E. Soliman
    German University in Cairo, New Cairo City, Egypt
  In view of the upcoming FAIR project (Facility for Antiproton and Ion Research) several long-term development projects had been initiated with regard to diagnostic devices for beam current measurement. The main accelerator of FAIR will be the fast ramped superconducting synchrotron SIS100. Design parameters of SIS100 are acceleration of 2.5·1013 protons/cycle to 29 GeV for the production of antiprotons, as well as acceleration and slow extraction of p to U ions at 109 ions/s in the energy range of 0.4-2.7 GeV/u and extraction times of up to 10 s. For high-intensity operation non-intercepting devices are mandatory, thus the developments presented in this contribution focus on purpose-built beam current transformers. First prototype measurements of a dc current transformer based on a Tunneling Magneto Resistance sensor are presented, as well as recent achievements with a SQUID-based Cryogenic Current Comparator.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG50  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUPG59 Bunch Extension Monitor for LINAC of SPIRAL2 Project linac, detector, positron, diagnostics 486
  • R.V. Revenko, J.L. Vignet
    GANIL, Caen, France
  A semi-interceptive monitor for bunch shape measure-ment has been developed for the LINAC of SPIRAL2. A Bunch Extension Monitor (BEM) is based on the registra-tion of X-rays emitted by the interaction of the beam ions with a thin tungsten wire. The time difference between detected X-rays and accelerating RF gives information about distribution of beam particles along the time axis. These monitors will be installed inside diagnostic boxes on the first five warm sections of the LINAC. The monitor consists of two parts: X-ray detector and mechanical system for positioning the tungsten wire into the beam. Emitted X-rays are registered by microchannel plates with fast readout. Signal processing is performed with constant fraction discriminators and TAC coupled with MCA. Results of bunch shape measurements obtained during commissioning of RFQ for SPIRAL2 are presented.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG59  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUPG70 Test of the Imaging Properties of Inorganic Scintillation Screens Using Fast and Slow Extracted Ion Beams extraction, target, radiation, proton 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUPG71 Ionization Profile Monitor Simulations - Status and Future Plans simulation, electron, detector, space-charge 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
TUPG73 Preparatory Work for a Fluorescence Based Profile Monitor for an Electron Lens electron, proton, photon, radiation 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEPG12 A Versatile BPM Signal Processing System Based on the Xilinx Zynq SoC electron, software, hardware, electronics 646
  • R.L. Hulsart, P. Cerniglia, N.M. Day, R.J. Michnoff, Z. Sorrell
    BNL, Upton, Long Island, New York, USA
  Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
A new BPM electronics module (V301) has been developed at BNL that uses the latest System on a Chip (SoC) technologies to provide a system with better performance and lower cost per module than before. The future of RHIC ion runs will include new RF conditions as well as a wider dynamic range in intensity. Plans for the use of electron beams, both in ion cooling applications and a future electron-ion collider, have also driven this architecture toward a highly configurable approach. The RF input section has been designed such that jumpers can be changed to allow a single board to provide ion or electron optimized analog filtering. These channels are sampled with four 14-bit 400MSPS A/D converters. The SoC's ARM processor allows a Linux OS to run directly on the module along with a controls system software interface. The FPGA is used to process samples from the ADCs and perform position calculations. A suite of peripherals including dual Ethernet ports, uSD storage, and an interface to the RHIC timing system are also included. A second revision board which includes ultra-low jitter ADC clock synthesis and distribution and improved power supplies is currently being commissioned.
poster icon Poster WEPG12 [4.839 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG12  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEPG23 Evaluating Beam-Loss Detectors for LCLS-2 detector, electron, linac, radiation 678
  • A.S. Fisher, R.C. Field, L.Y. Nicolas
    SLAC, Menlo Park, California, USA
  The LCLS x-ray FEL occupies the third km of the 3-km SLAC linac, which accelerates electrons in copper cavities pulsed at 120 Hz. For LCLS-2, the first km of linac will be replaced with superconducting cavities driven by continuous RF at 1300 MHz. The normal-conducting photocathode gun will also use continuous RF, at 186 MHz. The laser pulse rate will be variable up to 1 MHz. With a maximum beam power of 250 kW initially, and eventually 1 MW, the control of beam loss is critical for machine and personnel safety, especially since losses can continue indefinitely in linacs and dark current emitted in the gun or cavities can be lost at any time. SLAC protection systems now depend on ionization chambers, both local devices at expected loss sites and long gas-dielectric coaxial cables for distributed coverage. However, their ion collection time is over 1 ms, far slower than the beam repetition rate. We present simulations showing that with persistent losses, the space charge of accumulated ions can null the electric field inside the detector, blinding it to an increase in loss. We also report on tests comparing these detectors to faster alternatives.  
poster icon Poster WEPG23 [6.589 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG23  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEPG34 Heavy Ion Beam Flux and In-situ Energy Measurements at High LET detector, heavy-ion, cyclotron, radiation 700
  • S. Mitrofanov, I.V. Kalagin, V.A. Skuratov, Yu.G. Teterev
    JINR, Dubna, Moscow Region, Russia
  • V.S. Anashin
    United Rocket and Space Corporation, Institute of Space Device Engineering, Moscow, Russia
  The Russian Space Agency with the TL ISDE involvement has been utilizing ion beams from oxygen up to bismuth delivered from cyclotrons of the FLNR JINR accelerator complex for the SEE testing during last seven years. The detailed overview of the diagnostic set-up features used for low intensity ion beam parameters evaluation and control during the corresponding experiments is presented. Special attention is paid to measurements of ion flux and energy at high LET levels and evaluation of ion beam uniformity over large (200x200 mm) irradiating areas. The online non-invasive (in-situ) time of flight technique designed for low intensity ion beam energy measurements based on scintillation detectors is considered in details. The system has been successfully commissioned and is used routinely in the SEE testing experiments.  
poster icon Poster WEPG34 [7.361 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG34  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEPG42 Energy and Longitudinal Bunch Measurements at the SPIRAL2 RFQ Exit proton, rfq, diagnostics, electron 723
  • C. Jamet, W.LC. Le Coz, G. Ledu, S. Loret, C. Potier de courcy
    GANIL, Caen, France
  A new step of the SPIRAL2 commissioning started in December 2015 with the acceleration of a first proton beam at the RFQ exit. A test bench, with all the different diagnostics which will be used on the SPIRAL2 accelerator, was installed directly after the first rebuncher of the MEBT line in order to qualify beams but also to test and make reliable the diagnostic monitors. In 2016, different ion beams are qualified by the diagnostic test bench. This paper describes the results of the energy measurements done by a Time of Flight monitor and the longitudinal measurements using a fast faraday cup.  
poster icon Poster WEPG42 [3.072 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG42  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEPG68 An Investigation into the Behaviour of Residual Gas Ionisation Profile Monitors in the ISIS Extracted Beamline simulation, detector, synchrotron, proton 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEPG69 Profile Measurement by the Ionization Profile Monitor with 0.2T Magnet System in J-PARC MR electron, detector, injection, simulation 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
WEPG71 3D Density Scans of a Supersonic Gas Jet for Beam Profile Monitoring diagnostics, timing, electron, operation 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  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
THAL03 Multi-Laser-Wire Diagnostic for the Beam Profile Measurement of a Negative Hydrogen Ion Beam in the J-PARC LINAC laser, linac, electron, cavity 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.  
slides icon Slides THAL03 [1.861 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-THAL03  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)