Keyword: emittance
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MOAL02 Diagnostics at the Max IV 3 GeV Storage Ring During Commissioning diagnostics, storage-ring, linac, dipole 1
  • Å. Andersson, J. Breunlin, B.N. Jensen, R. Lindvall, E. Mansten, D. Olsson, J. Sundberg, P.F. Tavares, S. Thorin
    MAX IV Laboratory, Lund University, Lund, Sweden
  The MAX IV 3 GeV storage ring based on a multibend achromat lattice allowing for horizontal emittances from 330 pm rad down to 180 pm rad, depending on the number of insertion devices. The diagnostics used during commissioning will be described, with emphasis on the emittance diagnostics This will involve two diagnostic beam lines to image the electron beam with infrared and ultraviolet synchrotron radiation from bending dipoles, in order to determine also beam energy spread. The scheme for horizontal emittance measurements looks promising also for an order of magnitude lower emittance. Bunch lengthening with harmonic cavities is essential for the low emittance machine performance. We have used a radiation based sampling technique to verify individual bunch distributions.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOAL02  
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MOPG33 Design of RISP RFQ Cooler Buncher ion, 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.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG33  
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MOPG43 Beam Tuning for Longitudinal Profile at J-PARC Linac linac, resonance, quadrupole, DTL 150
  • A. Miura
    JAEA/J-PARC, Tokai-mura, Japan
  • Y. Liu, T. Maruta
    KEK/JAEA, Ibaraki-Ken, Japan
  • T. Miyao
    KEK, Ibaraki, Japan
  Using bunch shape monitors (BSMs), we measured the longitudinal bunch lengths of negative hydrogen ion beams in the J-PARC linac. A BSM was installed between two linacs, separate-type drift tube linac (SDTL) and an annular-ring-coupled structure linac (ACS), having acceleration frequencies of 324 and 972 MHz, respectively. We used radio-frequency amplitude modulation of bunches in the beam transport between the SDTL and ACS to minimize emittance growth and beam loss. We conducted amplitude scanning and compared the results with the twiss-parameters obtained from the transverse profiles. In this paper, we discuss the results of amplitude tuning of the buncher cavity at the point of beam loss and emittance. We also discuss the measurement results for various equipartitioning settings of quadrupole magnets.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG43  
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MOPG47 Beta Function Measurement for the AGS IPM dipole, flattop, betatron, proton 157
  • H. Huang, L. Ahrens, C.E. Harper, F. Méot, V. Schoefer
    BNL, Upton, Long Island, New York, USA
  Emittance control is important for polarization preservation of proton beam in the Alternative Gradient Synchrotron (AGS). For polarization preservation, two helical dipole partial snake magnets are inserted into the AGS lattice. In addition, the vertical tune has to run very high, in the vicinity of integer. These helical dipole magnets greatly distort the optics, especially near injection. The beta functions along the energy ramp have been modeled and measured at the locations of the Ion Profile Monitor (IPM). For the measurements to be valid, the betatron tune, dipole current and orbit responses have to be carefully measured. This paper summarize the experiment results and comparison with the model. These results will lead to understanding of emittance evolution in the AGS.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG47  
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MOPG54 Laser-Based Beam Diagnostics for Accelerators and Light Sources laser, network, electron, diagnostics 183
  • 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 289191.
The Laser Applications at Accelerators network (LA≥NET) was selected for funding within the European Union's 7th Framework Programme. During its 4 year duration the project has successfully trained 19 Fellows and organized numerous events that were open to the wider laser and accelerator communities. The network linked research into lasers and accelerators to develop advanced particle sources, new accelerating schemes, and in particular beyond state-of-the-art beam diagnostics. This contribution summarizes the research results in laser-based beam diagnostics for accelerators and light sources. It discusses the achievable resolution of laser-based velocimeters to measure the velocity of particle beams, the resolution limits of bunch shape measurements using electro-optical crystals, position resolution of laser wire scanners, and limits in energy measurements using Compton backscattering at synchrotron light sources. Finally, it also provides a summary of past and future events organized by the network and shows how an interdisciplinary research program can provide comprehensive training to a cohort of early career researchers.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG54  
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MOPG72 Diagnostic Test-Beam-Line for the Injector of MESA laser, cathode, electron, diagnostics 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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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG72  
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MOPG77 Design and Application of the Wire Scanner for CADS Proton Beams proton, rfq, instrumentation, controls 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.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG77  
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TUPG35 LEReC Instrumentation Design & Construction electron, ion, gun, injection 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  
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TUPG49 Review of Chromaticity Measurement Approaches Using Head-Tail Phase Shift Method at RHIC synchrotron, simulation, betatron, operation 457
  • V.H. Ranjbar, A. Marusic, M.G. Minty
    BNL, Upton, Long Island, New York, USA
  Funding: Work supported the URA., Inc., under contract DE-AC02-76CH03000 with the U.S. Dept. of Energy
We review tests of the head-tail phase shift method using various approaches at BNL's RHIC. Both the standard and some more exotic approaches to measure the phase differential between the head and tail of a bunched beam has been attempted at RHIC. The standard kick beam and measured phase evolution of the head and tail of a given bunch has been tried at RHIC. Additionally a more exotic approach to measure the head versus tail phase difference has been tried. In this approach we used a BBQ pickup and kicker with the input stripline signal to the BBQ mixed with a nano second pulse timed to the head and tail of the bunch. In this way we hoped to force the BBQ to sample the head or tail of the bunch depending on the pulse timing. We report on the results and challenges which each approach presented.
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG49  
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TUPG66 High-Energy X-Ray Pinhole Camera for High-Resolution Electron Beam Size Measurements detector, photon, operation, electron 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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TUPG72 Calibration of X-ray Monitor during the Phase I of SuperKEKB commissioning factory, detector, scattering, optics 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.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG72  
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TUPG79 LANSCE Isotope Production Facility Emittance Measurement System controls, diagnostics, isotope-production, hardware 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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WEBL01 Beam Diagnostics Challenges for Beam Dynamics Studies optics, linac, diagnostics, quadrupole 577
  • O.R. Jones
    CERN, Geneva, Switzerland
  This presentation will review the performance and limitations of present beam instrumentation in relation to beam dynamics studies, and give an overview of the main requirements from the accelerator physics community for new or improved measurements that need R&D effort from the beam diagnostics side.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEBL01  
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WEPG01 Numerical Comparative Study of BPM Designs for the HESR at FAIR pick-up, simulation, monitoring, software 608
  • A.J. Halama, C. Böhme, V. Kamerdzhiev, F. Klehr, S. Srinivasan
    FZJ, Jülich, Germany
  The institute of Nuclear Physics 4(IKP-4) of the Research Center Jülich (FZJ) is in charge of building and commissioning the High Energy Storage Ring (HESR) within the international Facility for Antiproton and Ion Research (FAIR) at Darmstadt. Simulations and numerical calculations were performed to characterize the BPM pickup design that is currently envisaged for the HESR, i.e. a diagonally cut cylindrical pickup. The equivalent circuit has been studied with emphasis on capacitive cross coupling. Based on our findings, performance increasing changes could be introduced. A prototype BPM was constructed and tested on a test bench. A comparison of results is presented. Another proposed design was characterized, as a symmetric coupling behavior is expected. That is a symmetrical straight four-strip geometry. Additionally an extensive study was conducted to see effects due to manufacturing tolerances. Driven by curiosity an eight-strip design was considered, which would allow for beam size measurements. First results for this configuration are shown. Used methodology, tools and results of expected signal level and sensitivity distributions are presented as well.  
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WEPG47 Progress on the PITZ TDS electron, laser, simulation, space-charge 744
  • H. Huck, P. Boonpornprasert, L. Jachmann, W. Köhler, M. Krasilnikov, A. Oppelt, F. Stephan
    DESY Zeuthen, Zeuthen, Germany
  • L.V. Kravchuk, V.V. Paramonov, A.A. Zavadtsev
    RAS/INR, Moscow, Russia
  • C. Saisa-ard
    Chiang Mai University, Chiang Mai, Thailand
  A transverse deflecting system (TDS) is under commissioning at the Photo Injector Test Facility at DESY, Zeuthen site (PITZ). The structure was designed and manufactured by the Institute for Nuclear Research (INR RAS, Moscow, Russia) as prototype for the TDS in the injector part of the European XFEL. Last year the deflection voltage was limited for safety reasons, but after thorough investigations of the waveguide system we are now able to operate the cavity close to design specifications. The PITZ TDS streaks the electron beam vertically, allowing measurements of the longitudinal bunch profile, and, in combination with a subsequent horizontal bending magnet, also of the longitudinal phase space and slice energy spread. Furthermore, several quadrupole magnets and screen stations can be employed for slice emittance measurements using the TDS. This paper describes the progress in commissioning of the hardware, measurement techniques and simulations, and outlines the prospects of reliable slice emittance measurements at 20 MeV/c, where space charge forces complicate the determination of transfer matrices.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG47  
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WEPG51 A Transverse Deflecting Structure for the Plasma Wakefield Accelerator Experiment, FLASHForward plasma, optics, cavity, quadrupole 759
  • R.T.P. D'Arcy, V. Libov, J. Osterhoff
    DESY, Hamburg, Germany
  The FLASHForward project at DESY is an innovative plasma-wakefield acceleration experiment, aiming to accelerate electron beams to GeV energies over a few centimeters of ionized gas. These accelerated beams must be of sufficient quality to be used in a free-electron laser; achievable only through rigorous analysis of both the drive- and accelerated-beam's longitudinal phase space. The pulse duration of these accelerated beams is typically in the few femtosecond range, and thus difficult to resolve with traditional diagnostic methods. In order to longitudinally resolve these very short bunch-lengths, it is necessary to utilize the properties of a transverse RF deflector (operating in the hybrid electromagnetic mode, HEM11), which provides a relation between longitudinal and transverse co-ordinates. It is proposed that this type of device, commonly known as a Transverse Deflecting Structure (TDS) due to its 'streaking' in the transverse plane, will be introduced to the FLASHForward beamline in order to perform these single-shot longitudinal phase space measurements. The initial investigations into the realization of this diagnostic tool are outlined.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG51  
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WEPG63 Performance Evaluation of Molybdenum Blades in an X-ray Pinhole Camera synchrotron, radiation, synchrotron-radiation, electron 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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WEPG74 Bridging the Gap; Updating LANSCE Digitizers linac, controls, distributed, data-acquisition 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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WEPG76 Status of the Two-Dimensional Synchrotron Radiation Interferometer at PETRA III diagnostics, radiation, synchrotron, controls 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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WEPG79 Time-Resolved Measurement of Quadrupole Wakefields in Corrugated Structures wakefield, quadrupole, electron, focusing 840
  • C. Lu, T. Jiang, L.B. Shi, L. Zhao
    LLP, Shanghai, People's Republic of China
  • F. Fu, S. Liu, D. Xiang, P.F. Zhu
    Shanghai Jiao Tong University, Shanghai, People's Republic of China
  • R. Wang
    SINAP, Shanghai, People's Republic of China
  • Z. Zhang
    TUB, Beijing, People's Republic of China
  Corrugated structures have recently been widely used for manipulating electron beam longitudinal phase space and for producing THz radiation. Here we report on time-resolved measurements of the quadrupole wakefields in planar corrugated structures. It is shown that while the time-dependent quadrupole wakefield produced by a planar corrugated structure causes significant growth in beam transverse emittance, it can be effectively canceled with a second corrugated structure with orthogonal orientation. The strengths of the time-dependent quadrupole wakefields for various corrugated structure gaps are also measured and found to be in good agreement with theories. Our work should forward the applications of corrugated structures in many accelerator based scientific facilities.  
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DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG79  
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