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linear-collider

 
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MOXPA01 The Global Design Initiative for an International Linear Collider collider, positron, electron, proton 1
 
  • B.C. Barish
    CALTECH, Pasadena, California
  Two years after the selection of the SC technology and a few months before the release of the ILC Conceptual Design Report, the presentation will review the main issues towards an ILC project and the world-wide collaboration presently set-up to address them. It will especially emphasize the challenges both technical (performances, reliability, machine protection, cost minimisation, industrialisation) and organisational, in a world-wide collaboration for the first time from the very beginning of the project. It will then present the status of the performances already demonstrated, the R&D presently envisaged to improve them or reduce the cost, the test facilities set-up to address them and the effort towards technology transfer to industry and industrialisation. Finally, it will present the plans and schedule for the future as well as the site specific parameters and cost issues.  
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MOPCH157 Structural Analysis for a Half-reentrant Superconducting Cavity simulation, TESLA, vacuum, linac 424
 
  • E. Zaplatin
    FZJ, Jülich
  • T.L. Grimm, W. Hartung, M. J. Johnson, M.S. Meidlinger, J. Popielarski
    NSCL, East Lansing, Michigan
  A half-reentrant cavity (1300 MHz, beta=1.0) is being developed at Michigan State University for use in a superconducting linear collider and other applications. The electromagnetic performance of a half-reentrant cell shape is similar to that of a fully reentrant cavity, but a multi-cell half-reentrant cavity can be cleaned using traditional techniques. We present the results of structural analyses of the half-reentrant cavity for the mid-cell, single-cell, and multi-cell cases. The analysis includes the static and dynamic response of the cavity. Stiffening options to minimize the resonant RF frequency shift due to pressure and the Lorentz force are explored.  
 
MOPCH160 A Beam-based High Resolution Phase Imbalance Measurement Method for the ILC Crab Cavities dipole, positron, single-bunch, electron 433
 
  • A. Kalinin, L. Ma, R.J. Smith
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  A high resolution method of RF phase adjustment and test is proposed for the Crab Cavity system of the ILC. The method is based on beam as ultimate test instrument. To measure phase imbalance in the pair of crab cavities (<0.02deg at 1.3GHz is required), a low energy (~1GeV) beam is used. A bunch center-of-mass trajectory through the cavities spaced (n+1/2) RF wavelengths and excited as in the case of the ILC, is a straight line for phase-balanced cavities and gets a kick when unbalanced. The kick is measured by two spaced BPMs with reference to the initial trajectory angle measured by two other BPMs. The method is insensitive to a bunch arrival time jitter and RF phase Common Mode jitter. A prototype of the test bench based on the method, is proposed. Using a 10MeV beam, two simple dipole cavities and low RF power, the prototype can be utilized for mastering high resolution measurements, for adjustment and tests of low level electronics of the Crab Cavity system and RF systems of XFEL ERLs as well. The phase resolution of the prototype is estimated as 0.01deg and the amplitude resolution as 0.01%.  
 
MOPCH169 High Pressure Rinsing Water Jet Characterization LEFT, TESLA, DIAMOND, collider 460
 
  • D. Sertore, E. Cavaliere, M. Fusetti, P. Michelato, C. Pagani, P. Pierini
    INFN/LASA, Segrate (MI)
  High pressure rinsing is widely used as the final wet step in the high field superconducting cavities production. The interaction of an high speed ultra pure water jet with the niobium surface depends on various parameters such as water pressure, water throughput, treatment duration, cavity rotation speed, etc. In this paper we illustrate a simple technique for the characterization of water jet parameters based on the momentum transfer between the water jet and a load cell. The jet profile and its dependence on water pressure as well as the force exerted by the jet on the surface are easily measured. Moreover a portable apparatus has been set up and the information gathered in different laboratories will be used for a quantitative comparison of the different HPR systems. These measurements allow to study the correlation of the jet parameters with the effects (surface status, oxide formation, corrosion, etc) of the water interaction with the niobium surface. Furthermore a new analysis, based on the luminescence induced on transparent dielectric samples, is used for confirmation of the water jet structure.  
 
MOPCH171 ILC Coaxial Blade Tuner TTF, DESY, LEFT, electron 466
 
  • C. Pagani, A. Bosotti, P. Michelato, N. Panzeri, R. Paparella, P. Pierini
    INFN/LASA, Segrate (MI)
  A coaxial (blade) tuner solution has been developed for the compensation of the Lorentz force detuning of the superconducting cavities under the high gradient pulsed operation foreseen for ILC operation. The device is based on prototypes successfully tested at DESY in 2002 both on CHECHIA and on the superstructures inserted in the TTF string. During both tests the blade tuner performed as expected in terms of stiffness, frequency sensitivity and tuning capabilities. An improvement of the tuner characteristics has been designed by the integration of fast tuning capabilities by means of piezo-ceramic element. Two prototipes of the new INFN coaxial piezo blade tuner have just been manufactured and they will be tested at DESY and BESSY after the cavity integration. In this paper the blade tuner design and main characteristics are presented, together with the early interpretation of the cold test results.  
 
MOPLS066 Direct Measurement of Geometric and Resistive Wakefields in Tapered Collimators for the International Linear Collider SLAC, emittance, collider, impedance 697
 
  • N.K. Watson, D. Adey, M.C. Stockton
    Birmingham University, Birmingham
  • D.A.-K. Angal-Kalinin, C.D. Beard, J.L. Fernandez-Hernando, F. Jackson
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R. Arnold, R.A. Erickson, C. Hast, T.W. Markiewicz, S. Molloy, M.C. Ross, S. Seletskiy, A. Seryi, Z. Szalata, P. Tenenbaum, M. Woodley, M. Woods
    SLAC, Menlo Park, California
  • R.J. Barlow, A. Bungau, R.M. Jones, G.Yu. Kourevlev, A. Mercer
    UMAN, Manchester
  • D.A. Burton, J.D.A. Smith, A. Sopczak, R. Tucker
    Lancaster University, Lancaster
  • C. Densham, G. Ellwood, R.J.S. Greenhalgh, J. O'Dell
    CCLRC/RAL, Chilton, Didcot, Oxon
  • Y.K. Kolomensky
    UCB, Berkeley, California
  • M. Kärkkäinen, W.F.O. Müller, T. Weiland
    TEMF, Darmstadt
  • N. Shales
    Microwave Research Group, Lancaster University, Lancaster
  • M. Slater
    University of Cambridge, Cambridge
  • I. Zagorodnov
    DESY, Hamburg
  • F. Zimmermann
    CERN, Geneva
  Precise collimation of the beam halo is required in the ILC to prevent beam losses near the interaction region that could cause unacceptable backgrounds for the physics detector. The necessarily small apertures of the collimators lead to transverse wakefields that may result in beam deflections and increased emittance. A set of collimator wakefield measurements has previously been performed in the ASSET region of the SLAC LINAC. We report on the next phase of this programme, which is carried out at the recently commissioned End Station A test facility at SLAC. Measurements of resistive and geometric wakefields using tapered collimators are compared with model predictions from MAFIA and GdfidL and with analytic calculations.  
 
MOPLS067 Test Beam Studies at SLAC's End Station A, for the International Linear Collider SLAC, linac, synchrotron, emittance 700
 
  • M. Woods, C. Adolphsen, R. Arnold, G.B. Bowden, G.R. Bower, R.A. Erickson, H. Fieguth, J.C. Frisch, C. Hast, R.H. Iverson, Z. Li, T.W. Markiewicz, D.J. McCormick, S. Molloy, J. Nelson, M.T.F. Pivi, M.C. Ross, S. Seletskiy, A. Seryi, S. Smith, Z. Szalata, P. Tenenbaum
    SLAC, Menlo Park, California
  • D. Adey, M.C. Stockton, N.K. Watson
    Birmingham University, Birmingham
  • M. Albrecht, M.H. Hildreth
    Notre Dame University, Notre Dame, Iowa
  • W.W.M. Allison, V. Blackmore, P. Burrows, G.B. Christian, C.C. Clarke, G. Doucas, A.F. Hartin, B. Ottewell, C. Perry, C. Swinson, G.R. White
    OXFORDphysics, Oxford, Oxon
  • D.A.-K. Angal-Kalinin, C.D. Beard, J.L. Fernandez-Hernando, F. Jackson, A. Kalinin
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • R.J. Barlow, A. Bungau, G.Yu. Kourevlev, A. Mercer
    UMAN, Manchester
  • S.T. Boogert
    Royal Holloway, University of London, Surrey
  • D.A. Burton, J.D.A. Smith, R. Tucker
    Lancaster University, Lancaster
  • W.E. Chickering, C.T. Hlaing, O.N. Khainovski, Y.K. Kolomensky, T. Orimoto
    UCB, Berkeley, California
  • C. Densham, R.J.S. Greenhalgh
    CCLRC/DL, Daresbury, Warrington, Cheshire
  • V. Duginov, S.A. Kostromin, N.A. Morozov
    JINR, Dubna, Moscow Region
  • G. Ellwood, P.G. Huggard, J. O'Dell
    CCLRC/RAL, Chilton, Didcot, Oxon
  • F. Gournaris, A. Lyapin, B. Maiheu, S. Malton, D.J. Miller, M.W. Wing
    UCL, London
  • M.B. Johnston
    University of Oxford, Clarendon Laboratory, Oxford
  • M.F. Kimmitt
    University of Essex, Physics Centre, Colchester
  • H.J. Schriber, M. Viti
    DESY Zeuthen, Zeuthen
  • N. Shales, A. Sopczak
    Microwave Research Group, Lancaster University, Lancaster
  • N. Sinev, E.T. Torrence
    University of Oregon, Eugene, Oregon
  • M. Slater, M.T. Thomson, D.R. Ward
    University of Cambridge, Cambridge
  • Y. Sugimoto
    KEK, Ibaraki
  • S. Walston
    LLNL, Livermore, California
  • T. Weiland
    TEMF, Darmstadt
  • M. Wendt
    Fermilab, Batavia, Illinois
  • I. Zagorodnov
    DESY, Hamburg
  • F. Zimmermann
    CERN, Geneva
  The SLAC Linac can deliver to End Station A a high-energy test beam with similar beam parameters as for the International Linear Collider for bunch charge, bunch length and bunch energy spread. ESA beam tests run parasitically with PEP-II with single damped bunches at 10Hz, beam energy of 28.5 GeV and bunch charge of (1.5-2.0)·1010 electrons. A 5-day commissioning run was performed in January 2006, followed by a 2-week run in April. We describe the beamline configuration and beam setup for these runs, and give an overview of the tests being carried out. These tests include studies of collimator wakefields, prototype energy spectrometers, prototype beam position monitors for the ILC Linac, and characterization of beam-induced electro-magnetic interference along the ESA beamline.  
 
MOPLS069 Development of a Superconducting Helical Undulator for the ILC Positron Source undulator, positron, electron, CERN 706
 
  • Y. Ivanyushenkov, E. Baynham, T.W. Bradshaw, A.J. Brummitt, F.S. Carr, J. Rochford
    CCLRC/RAL, Chilton, Didcot, Oxon
  • I.R. Bailey, D.P. Barber, J.A. Clarke, J.B. Dainton, O.B. Malyshev, D.J. Scott, B.J.A. Shepherd
    Cockcroft Institute, Warrington, Cheshire
  • P. Cooke, L.I. Malysheva
    Liverpool University, Science Faculty, Liverpool
  • G.A. Moortgat-Pick
    CERN, Geneva
  An undulator positron source has been recently selected by the International Linear Collider (ILC) community as a baseline. For the ILC a helical undulator capable of producing 10 MeV photons and with a period as close as possible to 10 mm is required. The HeliCal collaboration in the UK is looking at the merits of both permanent magnet and superconducting technologies for the design of a helical undulator. For the superconducting option, several prototypes have been built and tested. This paper details the design, construction and test results of the first superconducting prototypes.  
 
MOPLS074 Collimation Optimisation in the Beam Delivery System of the International Linear Collider collimation, lattice, betatron, collider 721
 
  • F. Jackson
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  The collimation systems of the International Linear Collider (ILC) beam delivery system (BDS) must perform efficient removal of halo particles which lie outside the acceptable ranges of energy and spatial spread. An optimisation strategy is developed to improve the performance of the BDS collimation system. Primary considerations are the phase relationships between collimation systems and the final focus, and the overall bandwidth of the system.  
 
MOPLS079 The Charged Beam Dumps for the International Linear Collider collider, electron, photon, TESLA 736
 
  • R. Appleby
    UMAN, Manchester
  • J.R.J. Bennett, T.A. Broome
    CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
  • C. Densham
    CCLRC/DL, Daresbury, Warrington, Cheshire
  • H. Vincke
    CERN, Geneva
  The baseline configuration of the International Linear Collider requires 2 beam dumps per interaction region, each rated to 18MW of beam power, together with additional beam dumps for tuning purposes and machine protection. The baseline design uses high pressure moving water dumps, first developed for the SLC and used in the TESLA design, although a gas based dump is also being considered. In this paper we discuss the progress made by the international community on both physics and engineering studies for the beam dumps.  
 
MOPLS088 Resonant Kicker System for Head-on-collision Option of Linear Collider kicker, electron, positron, collider 759
 
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto
  The separation of incoming and outgoing (electron and positron) beams at the interaction point of a linear collider is investigated using a resonant kicker system. It should enable head-on-collisions at the interaction point with the use of staggered passing times for each bunch at certain locations. Magnetic core materials for such a resonant kicker with a frequency of 6MHz are under investigation. Such a kicker system should minimize the perturbation of the incoming bunch with a finite bunch length, while it kicks the outgoing bunch by more than 1 millirad. Various arrangements of such kickers along the beamlines are discussed.  
 
MOPLS122 Design of the ILC Prototype FONT4 Digital Intra-train Beam-based Feedback System feedback, kicker, extraction, KEK 849
 
  • P. Burrows
    Queen Mary University of London, London
  • G.B. Christian, H. Dabiri Khah, A.F. Hartin, G.R. White
    JAI, Oxford
  • C.C. Clarke, C. Perry
    OXFORDphysics, Oxford, Oxon
  • A. Kalinin
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • D.J. McCormick, S. Molloy, M.C. Ross
    SLAC, Menlo Park, California
  We report on the design and initial testing of the 4th generation Feedback on Nanosecond Timescales (FONT) prototype intra-train beam-based feedback system for beam control and luminosity optimisation at the International Linear Collider (ILC). FONT4 comprises a fast-analogue front-end BPM signal processor, with an FPGA-based digital feedback processor and a fast-risetime kicker-driver amplifier. The system is being designed with a total latency budget (including signal propagation delays) of about 140ns. FONT4 will be deployed at the Accelerator Test Facility (ATF) at KEK, where it will be tested with the electron bunchtrain extracted from the ATF damping ring. The bunches will have a spacing of c. 150ns, chosen to match the ILC design. We report the results of initial beam tests of the system components. We aim to demonstrate feedback, with delay-loop operation, on this ILC-like bunchtrain.  
 
MOPLS123 Performance of the FONT3 Fast Analogue Intra-train Beam-based Feedback System at ATF feedback, kicker, SLAC, CLIC 852
 
  • P. Burrows
    Queen Mary University of London, London
  • G.B. Christian, A.F. Hartin, H.D. Khah, G.R. White
    JAI, Oxford
  • C.C. Clarke, C. Perry
    OXFORDphysics, Oxford, Oxon
  • A. Kalinin
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  • D.J. McCormick, S. Molloy, M.C. Ross
    SLAC, Menlo Park, California
  We report on the design and testing of the 3rd generation Feedback On Nanosecond Timescales (FONT) prototype intra-train beam-based feedback system for beam control and luminosity optimisation at the International Linear Collider (ILC). The all-analogue FONT3 electronics was designed to have an ultra-short latency of c. 10ns. We describe the design of the BPM signal processor, feedback circuit and kicker-driver amplifier. We report on deployment of FONT3 at the Accelerator Test Facility (ATF) at KEK, where it was tested with the 56ns-long electron bunchtrain extracted from the ATF damping ring. Feedback, with delay-loop operation, on the beam was demonstrated with a latency close to design. We comment on the applicability of this technology to ILC, as well as future warm-RF based linear colliders, such as CLIC.  
 
TUPCH043 Observations of the Longitudinal Electron Bunch Profile at 45MeV Using coherent Smith-Purcell radiation radiation, electron, background, collider 1100
 
  • G. Doucas, V. Blackmore, B. Ottewell, C. Perry
    OXFORDphysics, Oxford, Oxon
  • P.G. Huggard
    CCLRC/RAL, Chilton, Didcot, Oxon
  • M.B. Johnston
    University of Oxford, Clarendon Laboratory, Oxford
  • M.F. Kimmitt
    University of Essex, Physics Centre, Colchester
  • B. Redlich, A.F.G. van der Meer
    FOM Rijnhuizen, Nieuwegein
  Coherent Smith-Purcell (SP) radiation has been used to determine the longitudinal profile of the electron bunch at the FELIX facility, FOM Institute. Far-infrared radiation was detected using a simple, compact arrangement of 11 pyroelectric detectors. Background radiation was suppressed through the use of high quality optical filters, and an efficient light collection system. The measured bunch profile was most closely in agreement with 90% of the particles contained within 5.5ps, with an approximately triangular temporal profile.  
 
TUPCH105 Performance of a Nanometer Resolution BPM System extraction, alignment, dipole, SLAC 1256
 
  • S. Walston, C.C. Chung, P. Fitsos, J.G. Gronberg
    LLNL, Livermore, California
  • S.T. Boogert
    Royal Holloway, University of London, Surrey
  • J.C. Frisch, J. May, D.J. McCormick, M.C. Ross, S. Smith, T.J. Smith
    SLAC, Menlo Park, California
  • H. Hayano, Y. Honda, N. Terunuma, J. Urakawa
    KEK, Ibaraki
  • Y.K. Kolomensky, T. Orimoto
    UCB, Berkeley, California
  • A. Lyapin, S. Malton, D.J. Miller
    UCL, London
  • R. Meller
    Cornell University, Department of Physics, Ithaca, New York
  • M. Slater, M.T. Thomson, D.R. Ward
    University of Cambridge, Cambridge
  • V.V. Vogel
    DESY, Hamburg
  • G.R. White
    OXFORDphysics, Oxford, Oxon
  International Linear Collider (ILC) interaction region beam sizes and component position stability requirements will be as small as a few nanometers. It is important to the ILC design effort to demonstrate that these tolerances can be achieved – ideally using beam-based stability measurements. It has been estimated that RF cavity beam position monitors (BPMs) could provide position measurement resolutions of less than one nanometer and could form the basis of the desired beam-based stability measurement. We have developed a high resolution RF cavity BPM system. A triplet of these BPMs has been installed in the extraction line of the KEK Accelerator Test Facility (ATF) for testing with its ultra-low emittance beam. The three BPMs are rigidly mounted inside an alignment frame on variable-length struts which allow movement in position and angle. We have developed novel methods for extracting the position and tilt information from the BPM signals including a calibration algorithm which is immune to beam jitter. To date, we have been able to demonstrate a resolution of approximately 20 nm over a dynamic range of ± 20 microns. We report on the progress of these ongoing tests.  
 
TUPCH140 Studies of Thermal Fatigue Caused by Pulsed RF Heating collider, controls, linac, vacuum 1343
 
  • S.V. Kuzikov, Yu. Danilov, N.S. Ginzburg, N.Yu. Peskov, M.I. Petelin, A. Sergeev, A.A. Vikharev, N.I. Zaitsev
    IAP/RAS, Nizhny Novgorod
  • A.V. Elzhov, A. Kaminsky, O.S. Kozlov, E.A. Perelstein, S. Sedykh, A.P. Sergeev
    JINR, Dubna, Moscow Region
  • I. Syratchev
    CERN, Geneva
  A future linear collider with a multi-TeV level of energies of the collided particles in the center of masses is naturally associated with high frequencies and a high power RF level. One of the interfering factors in this way is an effect of copper damage due to multi-pulse mechanical stress caused by high-power microwaves. In order to get new information about this effect, we started an experiment with the test cavity fed by 30 GHz FEM oscillator (15-30 MW, 100-200 ns, 0.5 - 1 Hz). Now we finished the second phase of this experiment where the test cavity was irradiated by 0.1 millions of RF pulses with temperature rise ~140 C in each pulse. The third phase is the experiment with 1 million pulses. In the next planned experiment with 36 GHz magnetron (0.1-0.15 MW, 1-2 mks, 0.01 - 1 kHz) we are going to investigate the thermal fatigue in most interesting for collider application region of temperatures (30-50 C). It is expected that these two experiments will supply necessary statistical information for the developed theory of the thermal fatigue in order to extrapolate lifetime numbers to other values of the temperature rise and pulse duration.  
 
WEPCH067 Implementation of TPSA in the Mathematica Code LieMath lattice, sextupole, COSY, octupole 2077
 
  • D. Kaltchev
    TRIUMF, Vancouver
  The Lie Algebra package LieMath written in the Mathematica language constructs the beamline map in a single-exponent Lie generator form. The algorithm (BCH-based map concatenation) has been recently enhanced with Truncated Power Series Algebra (TPSA) techniques.The polynomials produced by the series expansion of the Hamiltonian are replaced with arrays of coefficients (derivative structures) and the Poisson bracket and BCH are defined as operations on such structures. We have confirmed the statement that using automatic differentiation instead of symbolic operations increases the speed by least an order of magnitude. The code is equipped with a MAD parser and a normal form block allowing it to extract nonlinear chromaticity and amplitude detuning. The notebook was applied in FFAG studies and may be useful for the linear collider final focus or collimation systems.  
 
WEPLS038 Design of Diamond-lined Accelerator Structure Test Cavity DIAMOND, collider, CLIC, acceleration 2457
 
  • C. Wang, V.P. Yakovlev
    Omega-P, Inc., New Haven, Connecticut
  • J.L. Hirshfield, M.A. LaPointe
    Yale University, Physics Department, New Haven, CT
  For a high-gradient normal-conducting accelerator structure for a future multi-TeV linear collider, the main limitation to achievement of high acceleration gradient is RF breakdown. In an attempt to increase the gradient beyond limits that are acceptable for metallic structures, a diamond-lined structure is suggested. The published DC breakdown limit for CVD diamond is ~2 GV/m, but the limit has never been determined for RF fields. Here we present a design for a 34-GHz diamond-lined rectangular test cavity, operating in the symmetric LSM-1,1,6 mode with symmetric side input couplers. The goal is to produce as high electric fields as possible (approaching 1 GV/m) at the diamond surfaces with ~10 MW of input power supplied by the Omega-P/Yale 34-GHz magnicon for experiment test of dielectric strength.  
 
WEPLS073 A Super Strong Adjustable Permanent Magnet Quadrupole for the Final Focus in a Linear Collider permanent-magnet, quadrupole, collider, CERN 2550
 
  • Y. Iwashita, T. Mihara
    Kyoto ICR, Uji, Kyoto
  • M. Kumada
    NIRS, Chiba-shi
  • C.M. Spencer
    SLAC, Menlo Park, California
  An adjustable permanent magnet quadrupole has been fabricated to demonstrate its feasibility for use in the final focus of a linear collider. The supposed requirements for such a final focus lens are the tight stabilities of its integrated field gradient and magnetic center, plus it must have adjustable strength. The high temperature coefficient of the permanent magnet material NEOMAX is compensated by use of the MS-1 Fe-Ni alloy. The magnet has two concentric rings of NEOMAX. The replacement of the inner ring with a smaller diameter one is planned in order to reach the highest gradient with the current configuration of the quadrupole system; the system has to be scaled down in size to fit in a real linear collider final focus system. A precise magnetic field measurement system is also under fabrication that will be able to measure the magnetic center to a fraction of a micron.  
 
THPCH089 The Electromagnetic Background Environment for the Interaction-point Beam Feedback System at the International Linear Collider feedback, background, SLAC, target 2997
 
  • G.B. Christian, P. Burrows, G.B. Christian, C.C. Clarke, A.F. Hartin, C. Swinson, G.R. White
    OXFORDphysics, Oxford, Oxon
  • R. Arnold, C. Hast, S. Smith, M. Woods
    SLAC, Menlo Park, California
  • A. Kalinin
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  The Interaction Point (IP) feedback system is essential for maintaining the luminosity at the International Linear Collider (ILC). It is necessary to demonstrate the performance of the feedback beam position monitor (BPM) in an electron-positron pair background similar to that expected in the ILC interaction region (IR). We have simulated the ILC beam-beam interactions and used a GEANT model of the IR to evaluate the pair and photon flux incident on the BPM, for both the 2 mrad and 20 mrad crossing angle geometries. We present results as a function of the proposed machine parameter schemes, as well as for various system layouts within the IR. We plan to study the degradation of BPM resolution, and the long term survivability, in beam tests at End Station A at SLAC. To simulate the background environment of the ILC a 'spray beam' will be produced, which will scatter from a mechanical mock-up of the forward region of the IR, and irradiate the BPM with realistic flux of secondary pairs. We present the proposed experimental layout and planned beam tests.  
 
THPCH146 Solid State Modulators for the International Linear Collider (ILC) klystron, collider, power-supply, controls 3131
 
  • M.A. Kempkes, N. Butler, J.A. Casey, M.P.J. Gaudreau, I. Roth
    Diversified Technologies, Inc., Bedford
  Diversified Technologies, Inc. (DTI) is developing two solid-state modulator designs for the International Linear Collider with SBIR funding from the U.S. Department of Energy. This paper will discuss design tradeoffs, energy storage requirements and alternatives, and the construction and test status of both ILC designs. The first design is a 150 kV hard switch, employing an innovative energy storage system, which must provide 25 kJ per pulse at very tight voltage regulation over the 1.5 millisecond pulse. DTI's design uses a quasi-resonant bouncer (with a small auxiliary power supply and switch) to maintain the voltage flattop, eliminating the need for massive capacitor banks. The second design builds upon earlier DTI work for the 500 kV, 500 A NLC modulators. It uses a solid-state Marx bank, with ~10 kV stages, to drive the ILC klystron. Staggered turn-on of the Marx stages provides voltage regulation without the need for large capacitor banks.  
 
THPCH147 Solid-state High Voltage Pulse Power in the 10-100 Nanosecond Regime kicker, damping, collider, insertion 3134
 
  • M.A. Kempkes, F.O. Arntz, N. Butler, J.A. Casey, M.P.J. Gaudreau
    Diversified Technologies, Inc., Bedford
  New particle accelerators, with voltages exceeding 50 kV and currents exceeding 1,000 A, require kicker magnet drivers to deliver pulsed power with durations in the 10-100 ns range. Similar levels of pulse performance are needed for state-of-the-art eximer laser systems, impulse radar transmitters, and particle accelerators for medical therapy. In addition, the processing of food using pulsed electric fields (PEF processing) has similar requirements. In this paper, DTI will review solid-state pulse power technologies capable of delivering high-voltage, high-current pulses with 10-to-100 nanosecond pulse duration. IGBTs, MOSFETs, snap-off diodes, and magnetic pulse compression will be discussed. Current research at Diversified Technologies, Inc. is exploring the impact of these switching devices and circuits on pulse wave shape, pulse repeatability, adjustability of pulse voltage, current and timing, maximum pulse rate (PRF), jitter, and robustness.  
 
THPCH195 New Developments on Low-loss Ferroelectrics for Accelerator Applications controls, collider, coupling, plasma 3251
 
  • A. Kanareykin, P. Schoessow
    Euclid TechLabs, LLC, Solon, Ohio
  • A. Dedyk, S.F. Karmanenko
    Eltech University, St. Petersburg
  • E. Nenasheva
    Ceramics Ltd., St. Petersburg
  • V.P. Yakovlev
    Omega-P, Inc., New Haven, Connecticut
  Recent results on development of BST (barium strontium titanium oxide composition) ferroelectric materials are presented to be used as the basis for new advanced technology components suitable for high-gradient accelerators. Ferroelectric materials offer significant benefits for linear collider applications, in particular, for switching and control elements where a very short response time of 10 ns can be potentially achieved. The applications include: fast active X-band and Ka-band high-power ferroelectric switches, high-power X-band, and L-band ferroelectric-based phase-shifters. The recently developed large diameter (11 cm) BST-based ferroelectric rings will be used at high pulse power (tens of megawatts) for the X-band components as well as at high average power (in the range of a few kilowatts) for the L-band phase-shifters, which are suitable for ILC applications.