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acceleration

      
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MOYAPA01 Laser-plasma Wakefield Acceleration: Concepts, Tests and Premises laser, electron, plasma, target 10
 
  • V. Malka
    Ecole Polytechnique, Palaiseau
  • J. Faure
    CEA, Gif-sur-Yvette
  • Y. Glinec, A. Lifschitz
    LOA, Palaiseau
  The presentation will review all novel methods presently developed to reach high accelerating fields from the concepts, to simulations, feasibility demonstration in real tests and performances presently achieved. It will point out and compare their potential but also their technical challenges and possible limitations. It will also present the necessary R&D and the tests presently envisaged including schedule and milestones not only in terms of fields but also of beam quality preservation and power efficiency. Finally, possible future applications will be suggested.  
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MOPCH014 Energy-time Correlation Measurements Using a Vertically Deflecting RF Structure CSR, emittance, FEL, DESY 80
 
  • M. Roehrs, C. Gerth, M. Huening, H. Schlarb
    DESY, Hamburg
  To initiate the lasing process in SASE-based Free Electron Lasers, electron bunches with high peak currents are necessary. At the VUV-FEL at DESY, high peak currents are produced by bunch shortening in magnetic chicanes induced by a linear energy-time gradient. The residual uncorrelated time-sliced energy width after compression is a crucial parameter for the lasing process. The final energy-time correlation provides important information about the compression process. This paper presents a measurement of slice energy spread and energy-time correlation using a vertically deflecting rf-structure (LOLA). The structure allows to map the time delay of bunch slices to the vertical axis of a screen. After dispersing the bunches horizontally with a dipole, the energy-time correlation can be directly obtained in a single shot measurement. Results for different bunch compression schemes are presented. The measured bunch length in case of a non-compressed beam is compared to streak camera measurements.  
 
MOPCH016 Bunch Compression Monitor radiation, electron, FEL, SASE 86
 
  • H. Delsim-Hashemi, J. Rossbach, P. Schmüser
    Uni HH, Hamburg
  • O. Grimm, H. Schlarb, B. Schmidt
    DESY, Hamburg
  • A.F.G. van der Meer
    FOM Rijnhuizen, Nieuwegein
  An accelerated bunch of electrons radiates coherently at wavelengths longer than or comparable to the bunch length. The first generation Bunch Compression Monitor (BCM) that is installed at the VUV-FEL applies this principle by measuring the total radiation intensity. For a better control on the degree of the compression, the radiated intensity in different bandwidth can be used. Dependent on the changes in the structure of the bunch, its radiation spectrum changes correspondingly. A new generation BCM uses wavelength dependent diffracting devices and multi-channel sensors to measure the signal in different wavelength channels simultaneously. This paper describes the construction of the first prototypes and experimental results in different short wavelength bands measured at the linac of the VUV-FEL at DESY, Hamburg.  
 
MOPCH079 Ion Optical Design of the Heavy Ion Synchrotron SIS100 ion, extraction, lattice, synchrotron 214
 
  • J. Stadlmann, K. Blasche, B. Franczak, C. Omet, N. Pyka, P.J. Spiller
    GSI, Darmstadt
  • A.D. Kovalenko
    JINR, Dubna, Moscow Region
  We present the ion optical design of SIS100, which is the main synchrotron of the FAIR project. The purpose of SIS100 is the acceleration of high intensity heavy ion and proton beams and the generation of short compressed single bunches for the production of secondary beams. Since ionization in the residual gas is the main loss mechanism, a new lattice design concept had to be developed, especially for the operation with intermediate charge state heavy ions. The lattice was optimized to generate a peaked loss distribution in charge separator like lattice cells. Thereby it enables the control of generated desorption gases in special catchers. For bunch compression, the lattice provides dispersion free straight sections and a low dispersion in the arcs. A special difficulty is the optical design for fast and slow extraction, and the emergency dumping of the high rigidity ions within the same short straight section.  
 
MOPCH087 Quasi-adiabatic Transition Crossing in the Hybrid Synchrotron synchrotron, induction, proton, beam-losses 234
 
  • Y. Shimosaki, K. Takayama, K. Torikai
    KEK, Ibaraki
  Non-adiabatic features around the transition energy are well-known to be one of most important beam physics issues in most of circular hadron accelerators. A novel technique to avoid them by the adiabatic motion, a quasi-adiabatic focusing-free transition crossing (QAFFTC), was proposed. In a longitudinally separated function-type accelerator*, in which particles are confined by an rf voltage or burrier voltages and accelerated by a step voltage, the confinement voltage can be arbitrarily manipulated as long as the particles do not diffuse, while a strict acceleration voltage is necessary for the orbit of a charged particle to be balanced in the radial direction. The introduction of QAFFTC is most suitable for the longitudinally separated function-type accelerator. This new method was examined in this type of accelerator**, both theoretically and experimentally. This was a first and significant application of the hybrid synchrotron. The results will be presented.

*K. Takayama and J. Kishiro, Nucl. Inst. Meth. A 451, 304 (2000).**K. Takayama et al. Phys. Rev. Lett. 94, 144801 (2005).

 
 
MOPCH114 Progress on Dual Harmonic Acceleration on the ISIS Synchrotron synchrotron, proton, power-supply, controls 309
 
  • A. Seville, D.J. Adams, D. Bayley, N.E. Farthing, I.S.K. Gardner, M.G. Glover, A. Morris, B.G. Pine, J.W.G. Thomason, C.M. Warsop
    CCLRC/RAL/ISIS, Chilton, Didcot, Oxon
  The ISIS facility at the Rutherford Appleton Laboratory in the UK is currently the most intense pulsed, spallation, neutron source. The accelerator consists of a 70 MeV H- Linac and an 800 MeV, 50 Hz, rapid cycling, proton Synchrotron. The synchrotron beam intensity is 2.5·1013 protons per pulse, corresponding to a mean current of 200 μA. The synchrotron beam is accelerated using six, ferrite loaded, RF cavities with harmonic number 2. Four additional, harmonic number 4, cavities have been installed to increase the beam bunching factor with the potential of raising the operating current to 300 μA. As ISIS has a busy user schedule the time available for dual harmonic work has been limited. However, much progress has been made in the last year and encouraging results have been obtained. This paper reports on the hardware commissioning and beam tests with dual harmonic acceleration.  
 
MOPCH118 Wideband Low-output-impedance RF System for the Second Harmonic Cavity in the ISIS Synchrotron impedance, synchrotron, beam-loading, controls 321
 
  • Y. Irie
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • D. Bayley, G.M. Cross, I.S.K. Gardner, M.G. Glover, D. Jenkins, A. Morris, A. Seville, S.P. Stoneham, J.W.G. Thomason, T. Western
    CCLRC/RAL/ISIS, Chilton, Didcot, Oxon
  • J.C. Dooling, D. Horan, R. Kustom, M.E. Middendorf, G. Pile
    ANL, Argonne, Illinois
  • S. Fukumoto, M. Muto, T. Oki, A. Takagi, S. Takano
    KEK, Ibaraki
  Wideband low-output-impedance RF system for the second harmonic cavity in the ISIS synchrotron has been developed by the collaboration between Argonne National Laboratory, US, KEK, Japan and Rutherford Appleton Laboratory, UK. Low output impedance is realized by the feedback from plate output to grid input of the final triode amplifier, resulting in less than 30 ohms over the frequency range of 2.7 - 6.2 MHz which is required for the second harmonic cavity. The vacuum tubes in the driver and final stages are both operated in class A, and a grid bias switching system is used on each tube to avoid unnecessary plate dissipations during a non-acceleration cycle. High power test was performed with a ferrite-loaded second harmonic cavity, where the bias current was swept at 50 Hz repetition rate. The maximum voltage of 12kV peak per accelerating gap was obtained stably at earlier period of an acceleration cycle. A beam test with this system is planned at the ISIS synchrotron in order to investigate how the low impedance system works under heavy beam loading conditions, and is capable of mitigating the space charge detuning at the RF trapping stage.  
 
MOPCH119 Present Status of the Induction Synchrotron Experiment in the KEK PS induction, synchrotron, KEK, proton 324
 
  • K. Takayama, Y. Arakida, T. Iwashita, T. Kono, E. Nakamura, Y. Shimosaki, M.J. Shirakata, T. Sueno, K. Torikai
    KEK, Ibaraki
  • K. Otsuka
    Nippon Advanced Technology Co. Ltd., Ibaraki-prefecture
  A concept of the induction synchrotron, which was proposed by Takayama and Kishiro in 2000, has been demonstrated by using the KEK PS since 2004. A proton bunch trapped in the RF bucket was accelerated with the induction acceleration devices from 500 MeV to 8 GeV*, which was energized with the newly developed switching power supply. This form of the KEK PS is something like a hybrid synchrotron. In addition, the injected proton bunch was confined by the step barrier-voltages at the injection energy of 500MeV**, which were generated with the same induction acceleration device. Then a concept of the induction synchrotron that a proton bunch was captured by the barrier bucket and accelerated with the induction voltage is to be fully demonstrated.

*K. Takayama et al. "Observation of the Acceleration of a Single Bunch by Using the Induction Device in the KEK Proton Synchrotron", Phys. Rev. Lett., 94, 144801 (2005).**K. Torikai et al. "Acceleration and Confinement of a Proton Bunch with the Induction Acceleration System in the KEK Proton Synchrotron", submitted to Phys. Rev. ST-AB (2005), KEK-Preprint 2005-80 A, December 2005.

 
 
MOPCH126 Accelerator Research on the Rapid Cycling Synchrotron at IPNS proton, synchrotron, extraction, injection 339
 
  • G.E. McMichael, F.R. Brumwell, L. Donley, J.C. Dooling, W. Guo, K.C. Harkay, Q.B. Hasse, D. Horan, R. Kustom, M.K. Lien, M.E. Middendorf, M.R. Moser, S. Wang
    ANL, Argonne, Illinois
  The Intense Pulsed Neutron Source (IPNS) at Argonne National Laboratory is a national user facility for neutron scattering. Neutrons are produced by 70 ns pulses of protons (~3x 1012 protons per pulse) impacting a depleted-uranium target at a pulse repetition rate of 30 Hz. Three accelerators in series (a 750 keV Cockcroft-Walton, 50 MeV Alvarez linac accelerating H- ions, and a 450 MeV rapid-cycling proton synchrotron) provide the beam that is directed to the target. New diagnostics and a third rf cavity that can be operated at either the fundamental or second harmonic of the ring frequency have recently been installed and an experimental program established to try to gain understanding of an instability that limits the charge-per-bunch in the RCS. This program will be described, and preliminary results presented.  
 
MOPCH138 Choice of Proton Driver Parameters for a Neutrino Factory target, proton, factory, beam-loading 372
 
  • W.-T. Weng, J.S. Berg, R.C. Fernow, J.C. Gallardo, H.G. Kirk, N. Simos
    BNL, Upton, Long Island, New York
  • S.J. Brooks
    CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
  A Neutrino Factory typically comprises the following subsystems: proton driver; target; muon collection and conditioning( bunching, phase rotation, and cooling); muon acceleration; and muon decay ring. It takes great effort to design each subsystem properly, such that it can mesh with all other subsystems to optimize the overall facility performance. This optimization is presently being studied as part of the International Scoping Study of a Future Neutrino Factory and Superbeam Facility. This paper will evaluate the implications of other subsystems on the parameters of a proton driver for a Neutrino Factory. At the desired power of 4 MW, the impacts of the choice of the proton energy, bunch length, bunch intensity, and repetition rate on other subsystems are assessed to identify a proper range of operation for each parameter. A suitable "design phase space" of proton driver parameters is defined. Given possible choices of design parameters for proton driver, we compare the performance of a linac, a synchrotron, and an FFAG accelerator. The relative merits of existing proton driver proposals will also be examined.  
 
MOPCH139 Results and Experience with Single Cavity Tests of Medium Beta Superconducting Quarter Wave Resonators at TRIUMF linac, heavy-ion, ion, radiation 375
 
  • V. Zviagintsev, K. Fong, M.P. Laverty, R.E. Laxdal, A.K. Mitra, T.C. Ries, I. Sekachev
    TRIUMF, Vancouver
  A heavy ion superconducting linac is being installed at ISAC/TRIUMF. A first stage of the ISAC-II upgrade will see the installation of 20 quarter wave bulk niobium cavities (Beta0=0.057,0.071). The cavities operate CW at 106MHz with design peak fields of Ep=30MV/m, Bp=60mT while delivering an accelerating voltage of 1.08MV at <7W power consumption. All cavities have been tested in a single cavity test stand with twenty of twenty-one meeting ISAC-II specifications. The cavity test results will be presented. In particular we will discuss our experience with BCP vs. EP surface treatments and with Q-disease. In addition the tuning plates of two of the cavities were modified to provide a unique compensation to the resonant frequency.  
 
MOPCH162 RF Requirements for the 4GLS Linac Systems linac, ERL, electron, controls 439
 
  • P.A. McIntosh, C.D. Beard, D.M. Dykes, A.J. Moss
    CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
  The 4GLS facility at Daresbury will combine energy recovery linac (ERL) and free electron laser (FEL) technologies to deliver a suite of naturally synchronised state-of-the-art sources of synchrotron radiation and FEL radiation covering the terahertz (THz) to soft X-ray regimes. CW-mode operation at high acceleration gradients are needed for the various 4GLS accelerator systems and here is where Superconducting Radio Frequency (SRF) cavities excel. Since resistive losses in the cavity walls increase as the square of the accelerating voltage, conventional copper cavities become uneconomical when the demand for high CW voltage grows with particle energy requirements. After accounting for the refrigeration power needed to provide the liquid helium operating temperature, a net power gain of several hundred remains for SRF over conventional copper cavities. This paper details the RF requirements for each of the SRF accelerating stages of the 4GLS facility, outlining techniques necessary to cope with CW-mode operation and HOM power generation.  
 
MOPCH165 Low- and Intermediate-beta, 352 MHz Superconducting Half-wave Resonators for High Power Hadron Acceleration hadron, proton, linac, vacuum 448
 
  • A. Facco, F. Scarpa, D. Zenere
    INFN/LNL, Legnaro, Padova
  • R. Losito
    CERN, Geneva
  • V. Zviagintsev
    TRIUMF, Vancouver
  A beta=0.17, 352 MHz superconducting Half-Wave resonator was designed and constructed at INFN-LNL in the framework of the SPES and EURISOL projects. This cavity, together with the beta=0.31 HWR of similar design that was previously built in the framework of the SPES project, allows acceleration of high power hadron beams in the 5?100 MeV/u energy range, as required in the SPES primary linac and in the first part of the EURISOL proton driver. Main features of this structure, compared to other ones developed elsewhere with different geometries for similar applications, are compactness and mechanical stability. Characteristics and test results will be presented.  
 
MOPCH194 Studies of the Alignment Tolerance for the Injector System of the IFUSP Microtron alignment, simulation, microtron, beam-losses 517
 
  • T.F. Silva, M.N. Martins, P.B. Rios
    USP/LAL, Sao Paulo
  The Instituto de Fmsica da Universidade de Sco Paulo (IFUSP) is building a two-stage 38 MeV continuous-wave racetrack microtron. In this work, we describe the determination of alignment tolerances for the injector system of the IFUSP Microtron. This system consists of a linear accelerator with input energy of 100 keV and output energy of 1.8 MeV. The work presented ere involves analysis of our possibilities of alignment, the beam specifications for the acceleration structures and the strength of the correcting coils. Simulations were made using a method based on rotation matrices that allows for misalignments in the optical elements. It uses a tolerance parameter, given by the user, which is interpreted as a standard deviation of the normal misalignment distribution used to shuffle a configuration. A 5% loss of particles is achieved at a tolerance of 0.25-mm, without the inclusion of correcting coils (steerings) in the simulations.  
 
TUZAPA01 Present Status of the J-PARC Accelerator linac, injection, quadrupole, proton 930
 
  • H. Kobayashi
    KEK, Ibaraki
  The Japan Proton Accelerator Research Complex (J-PARC) is a joint project of High Energy Accelerator Research Organization (KEK) and Japan Atomic Energy Agency (JAEA), which started on April 1, 2001. The J-PARC accelerator complex is composed of a 400 MeV proton linac, a 3 GeV Rapid-Cycling Synchrotron (RCS), and a 50 GeV Proton Synchrotron (MR). A 180-MeV beam ( in the first stage) accelerated by the linac is to be injected into the RCS, and further accelerated there to 3 GeV. The RCS will operate at 25 Hz, and will provide the Materials and Life Science Facility (MLF) with a 1-MW beam (600 kW during 180 MeV injection). There are two extraction sections in the MR: fast extraction for neutrino experiment and slow extraction for the Hadron Facility. A linac beam with a peak current of 30 mA and an energy of 19.7 MeV was successfully accelerated in Sep. 2004 using the first tank of the Drift Tube Linac in KEK. Now three accelerators are under installation. The beam commissioning of the linac will start in this December and those of the RCS and the MR will start in Sep. 2007 and May 2008, respectively. Status of installation and plan for commissioning run will be presented.  
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TUXFI01 FFAG Accelerators and their Applications proton, focusing, target, emittance 950
 
  • Y. Mori
    KURRI, Osaka
  This talk will give an introduction to the FFAG concept and review the present development of FFAG accelerators. It will also discuss the use of FFAGs for applications such as hadron therapy, neutron generation, BNCT, ADS, and muon acceleration.  
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TUOCFI03 RF Cavity with Co-based Amorphous Core impedance, synchrotron, controls, feedback 983
 
  • M. Kanazawa, T. Misu, A. Sugiura
    NIRS, Chiba-shi
  • K. Katsuki
    Toshiba, Yokohama
  A compact acceleration cavity has been developed with new Co-based amorphous cores, which will be used in a dedicated synchrotron for cancer therapy. This core has high permeability that makes the cavity length short, and the cavity with no tuning system is possible with low Q-value of about 0.5. An acceleration cavity consists of two units that have a single acceleration gap at the center, and at the both side of the gap there are quarter wave coaxial resonators. Considering the requirements for easy operation, a transistor power supply was used instead of commonly used tetrode in the final stage RF amplifier. Each resonator has maximum impedance about 400? at 3MHz, and has been attached with 1:9 impedance transformer. In the frequency range from 0.4 to 8 MHz, the acceleration voltage of more than 4kV can be obtained with total input RF power of 8kW. With these performances, the cavity length is short as 1.5m. In this paper the structure of the cavity and their tested high power performances are presented.  
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TUPCH012 Digital Techniques in BPM Measurements at GSI-ISI pick-up, feedback, synchrotron, GSI 1019
 
  • A.A. Galatis, P. Kowina, K. Lang, A. Peters
    GSI, Darmstadt
  In this paper we describe new approaches for BPM measurements in hadron accelerators, which have strongly varying beam parameters such as intensity, accelerating frequency and bunch length. Following signal dynamic adjustment, direct digitalization and treatment of digitized data, we should reach a BPM resolution of 0.1mm. Interchangeability of this method between accelerators should be provided, which results in autonomous data treatment algorithms, free of external status and timing signalling. This should ensure the usability of the system in other bunched accelerator rings. Different operation modes are intended for allowing online storage of beam position data over full acceleration cycles as well as storage of beam waveforms in regions of acceleration that are of special interest e.g. transition, kicking, bunch gymnastics. First results of realised hardware/software combinations will be introduced and discussed.  
 
TUPCH025 Precision RF Gun Phase Monitor System for the VUV-FEL laser, gun, electron, power-supply 1052
 
  • H. Schlarb, N. Heidbrook, H. Kapitza, F. Ludwig, N. Nagad
    DESY, Hamburg
  For RF photo-injectors, the properties of the high brightness beam critically depend on the synchronization between the RF gun acceleration phase and the photo-cathode laser. At the VUV-FEL, the phase stability is determined by operating the RF gun close to zero-crossing RF phase. This allows the conversion of phase variations into charge variations which then is readout by a precision charge measurement system based on toroids. In this paper, we discuss the limitation of this method. Resolution reduction of the charge measurement system due to electro-magnetic-interference is discussed in detail.  
 
TUPCH035 Fine Spatial Beam Loss Monitoring for the ISIS Proton Synchrotron dipole, beam-losses, monitoring, synchrotron 1079
 
  • S.J. Payne, S.A. Whitehead
    CCLRC/RAL/ISIS, Chilton, Didcot, Oxon
  Beam loss detection at the ISIS synchrotron is achieved using a series of 3 and 4 metre long argon gas ionisation tubes placed around the inside track of the main ring and along the injector and extraction sections. Even with this level of diagnostics problems have occurred, for example, inside a main dipole within the accelerator ring where small concentrated areas of loss have resulted in severe damage to the RF shield. This type of loss cannot be easily resolved using the conventional argon gas system due to the length of the detectors and their distance from the vacuum vessel (around 2m). We report here the development of a compact beam loss monoitoring system which has been installed inside a dipole between the vacuum vessel and the main body of the dipole. The system comprises of six 150 sq. cm. (BC408) plastic scintillators connected to photo-multiplier tubes via fibre optic bundles. Measurements taken demonstrate that the new system can easily resolve complex beam loss patterns along the dipole while remaining robust to the high radiation environment. We also report here details of our PXI based data collection and display system.  
 
TUPCH054 Upgrade of Signal Processing of the BPM System at the SPring-8 Storage Ring target, pick-up, storage-ring, synchrotron 1130
 
  • T. Fujita, S. Sasaki, M. Shoji, T. Takashima
    JASRI/SPring-8, Hyogo-ken
  SPring-8 is a third generation synchrotron light source, which is operated stably with top-up mode and with optics of low emittance mode. Along with stabilization of electron beam orbit in the ring, upgrading of the BPM system has also been required. We have developed a new signal processing circuit for COD measurement with a target of a few microns of position resolution at 1 kHz band-width and a few hundreds per second to take beam position of all BPMs. In the new circuit, a multiplexing method is employed and the IF frequency is directory detected with a 2MSPS 16-bit ADC. The digitized signal is processed with DSP to obtain beam position. Analog components of the circuit are equipped in a temperature controlled cabinet in order not to be affected by fluctuation of ambient temperature. In this paper we report schematics and performance of the new circuit, e.g., dependence of position resolution on measurement band-width and long time stability, etc. In addition, we briefly describe possibility of fast orbit measurement as a further application of the circuit.  
 
TUPCH080 Bunched Beam Current Measurements with 100 pA rms Resolution at CRYRING pick-up, CRYRING, ion, background 1196
 
  • A. Paal, A. Simonsson
    MSL, Stockholm
  • J. Dietrich, I. Mohos
    FZJ, Jülich
  In CRYRING molecular beams with currents down to 1 nA are used for experiments. To extend the rms resolution of the bunched beam current measurements down to 100 pA, a BERGOZ Integrating Current Transformer (ICT) and one of the the capacitive pick-up's sum signal are integrated simultaneously. The absolute calibration of the pick-up integrator signal is carried out at the end of the acceleration stage, during 20-60 ms. The ion beam current can be measured over a pulse width range of 100 ns to 15 us with a 20-60% bunch duty cycle. For both detectors, low noise amplifiers and a differential input double integrator have been designed. A programmable phase shifter allows measurement of the beam current during the acceleration of the ions, generating a gate signal with proper phase for the integrators in the 30 kHz-3 MHz frequency range. The bandwidth of the integrators used is 100 Hz.  
 
TUPCH101 Modeling of Ultrafast Streak Cameras electron, simulation, cathode, electromagnetic-fields 1250
 
  • G. Huang, J.M. Byrd, J. Feng, H.A. Padmore, J. Qiang, W. Wan
    LBNL, Berkeley, California
  We present progress on modeling of streak camera with application to measurement of ultrafast phenomena. Our approach is based on treating the streak camera as a photocathode gun and applying modeling tools for beam optics, space charge, and electromagnetic fields. We use these models to compare with experimental results from a streak camera developed at the Advanced Light Source. Furthermore, we explore several ideas for achieving sub-100 fsec resolution.  
 
TUPCH124 Improvement of Co-based Amorphous Core for Untuned Broadband RF Cavity impedance, LEFT, heavy-ion, synchrotron 1304
 
  • A. Sugiura, M. Kanazawa, T. Misu, S. Yamada
    NIRS, Chiba-shi
  • K. Katsuki, T. Kusaka, K. Sato
    Toshiba, Yokohama
  We have developed a cobalt-based amorphous core as a new magnetic-alloy (MA) core for the loaded RF cavity. Because of its permeability found to be approximately twice as high as that of FINEMET, this MA core is an excellent candidate for constructing a compact broadband RF cavity with less power consumption. In this report, we present our recent studies of the Co-based amorphous core's physical properties and performance. Improvement of the new core coated by new materials surface of ribbon is also described.  
 
TUPCH128 New Cutting Scheme of Magnetic Alloy Cores for J-PARC Synchrotrons DIAMOND, synchrotron, KEK, beam-loading 1313
 
  • C. Ohmori, S. Anami, E. Ezura, Y. Funahashi, K. Hara, K. Hasegawa, A. Takagi, M. Toda, K. Ueno, M. Yoshii
    KEK, Ibaraki
  • Y. Morita, T. Yoshioka
    ICEPP, Tokyo
  • M. Nomura, A. Schnase, F. Tamura, M. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  A new cutting method using a grindstone was developed to manufacture the magnetic alloy cores. The problem of local temperature rise around the cut surfaces was solved. Long-term high-power tests have been performed for both J-PARC RCS and MR RF systems. Mechanism of local heating, new cutting scheme, and manufacturing method are presented.  
 
TUPCH131 High Power Test of MA Cavity for J-PARC RCS impedance, synchrotron, proton, power-supply 1322
 
  • M. Yamamoto, M. Nomura, A. Schnase, F. Tamura
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • S. Anami, E. Ezura, K. Hara, C. Ohmori, A. Takagi, M. Toda, M. Yoshii
    KEK, Ibaraki
  • K. Hasegawa
    JAEA, Ibaraki-ken
  We have been constructing the RF system for the J-PARC RCS. Almost all of the power supplies and the tube amplifiers have been constructed, and the cavities are under construction. All of them are tested at the experimental hall before installing into the J-PARC RCS building. We test the hybrid cavity scheme to realize the optimum cavity Q-value. The results of the test are described.  
 
TUPCH193 Low Level RF Control System Modules for J-PARC RCS controls, synchrotron, simulation, dipole 1465
 
  • A. Schnase, M. Nomura, F. Tamura, M. Yamamoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
  • S. Anami, E. Ezura, K. Hara, C. Ohmori, A. Takagi, M. Yoshii
    KEK, Ibaraki
  After completing the design phase, the VME modules for the Low Level RF Control (LLRF) of the Rapid Cycling Synchrotron of J-PARC are now in the production and debugging phase. First all modules are tested for basic functionality, for example dual harmonic signal generation. Then sets of modules are connected together to check higher-level functions and feedback. Finally, the LLRF modules are interfaced to high voltage components like amplifiers and cavities. We present the results of these tests, the test methods and test functions on several levels. This way we simulate beam operation working conditions and gain experience in controlling all parameters.  
 
TUPLS024 FFAGs as Muon Accelerators for a Neutrino Factory resonance, emittance, alignment, beam-losses 1541
 
  • S. Machida
    CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
  The FFAG accelerator is a solution for rapid acceleration of muons because of its large aperture and no need of magnet ramping. Its particle dynamics is, however, peculiar due to high energy gain per turn and large transverse amplitude, which has not been seen in other types of circular accelerators. One variation of FFAG, called non-scaling FFAG, employs quite new scheme, namely, out of bucket acceleration. We studied emittance distortion, coupled motions among 3-D planes, effects of resonance lines, etc., based on a newly developed tracking code. In this paper, we will emphasize new regime of particle dynamics as well as a modeling technique of FFAG.  
 
TUPLS025 Racetrack Non-scaling FFAG for Muon Acceleration betatron, lattice, focusing, linac 1544
 
  • D. Trbojevic
    BNL, Upton, Long Island, New York
  The non-scaling Fixed-Field Alternating Gradient (FFAG) machines have very strong focusing, large momentum acceptance, and small dispersion and betatron functions. This report is a study of using a compact non-scaling FFAG in combination with the superconducting linac to accelerate the muons. The drift space between two kinds of combined function magnets in the previous non-scaling FFAG is removed. The time of flight in the non-scaling FFAG has a parabolic dependence on momentum. The large energy acceptance of the machine requires matching between the linac and the non-scaling FFAG arcs for both the betatron and dispersion functions over the entire energy range.  
 
TUPLS027 A Non-scaling FFAG for Radioactive Beams Acceleration (RIA) lattice, injection, extraction, RIA 1547
 
  • D. Trbojevic, T. Roser, A.G. Ruggiero
    BNL, Upton, Long Island, New York
  One of the most expensive components of proposals to accelerate heavy radioactive beams is the superconducting linac. This is an attempt to design a non-scaling Fixed-Field Alternating-Gradient (FFAG) lattice to allow acceleration of heavy radioactive beams in a short time period with an acceptance in momentum of ±50%. As it had been previously reported the non-scaling FFAG has very small orbit offsets, very strong focusing, and large momentum acceptance. The lattice with small combined function magnets would provide substantial savings in the cost of the RF.  
 
TUPLS031 Commissioning of the ISAC-II Heavy Ion Superconducting Linac at TRIUMF linac, ion, heavy-ion, vacuum 1556
 
  • R.E. Laxdal, W. Andersson, K. Fong, M. Marchetto, A.K. Mitra, W.R. Rawnsley, I. Sekachev, G. Stanford, V.A. Verzilov, V. Zviagintsev
    TRIUMF, Vancouver
  A new heavy ion superconducting linac at TRIUMF is being installed to boost the final energy of radioactive beams from ISAC from 1.5MeV/u to above the Coulomb barrier. A first stage of 20MV consisting of five medium beta cryomodules each with four quarter wave bulk niobium cavities and a superconducting solenoid is being commissioned in early 2006. The cavities (Beta0=0.057, 0.071) operate cw at 106MHz with design peak fields of Ep=30MV/m, Bp=60mT while delivering an accelerating voltage of 1.08MV at ~4W power consumption. The report will summarize the commissioning results and early operating experience.  
 
TUPLS040 Tuning of a 4-rod CW-mode RFQ Accelerator rfq, resonance, pick-up, vacuum 1583
 
  • P. Fischer, A. Schempp
    IAP, Frankfurt-am-Main
  A four-rod RFQ accelerator has been built which operates in CW mode with a power consumption of 250 kW. The assembly of a high power RFQ structure requires a precise mechanical alignment and field tuning of the electrode field. The field distribution must be very flat to enable a proper operation with few losses. Adjusting of the field distribution is critical in long structures. Simulations and the status of the tuned structure will be discussed.  
 
TUPLS048 Optimization Design of a Side Coupled Linac (SCL) for Protontherapy: a New Feeding Solution linac, proton, cyclotron, SCL 1603
 
  • V.G. Vaccaro, A. D'Elia
    Naples University Federico II and INFN, Napoli
  • T. Clauser, A.C. Rainò
    Bari University, Science Faculty, Bari
  • C. De Martinis, D. Giove, M. Mauri
    INFN/LASA, Segrate (MI)
  • S. Lanzone
    CERN, Geneva
  • M.R. Masullo
    INFN-Napoli, Napoli
  • R.J. Rush
    e2v technologies, Chelmsford, Essex
  • V. Variale
    INFN-Bari, Bari
  It is proposed to use an SCL, starting at 30MeV, up to 230MeV. The linac consists of 25 modules (two tanks each). Twelve, 3GHz power generators, feed two modules in parallel, with the last power generator feeding the last module. The SCL is designed, assuming a mean accelerating field in the cavities of 16,5MV/m. The longitudinal and transverse beam dynamics has been studied, assuming that the input parameters (emittance, energy spread and mean current) are those of commercial 30MeV cyclotrons. The characteristics of the ejected beam were analysed: the transmittance value is largely sufficient to deliver a correct dose for therapy; the beam line activation is kept largely below allowed levels; the output energy spread is sufficiently small. The first prototype module is under construction and a second one is under design. Contacts with e2v have been established for defining an agreement, which proposes to use magnetrons as feeders for the acceleration tests. Attention was therefore paid to phase locking constraints between feeders. Theoretical studies suggest that transmittance stays constant if de-phasing is kept into values that seem attainable with magnetrons.  
 
TUPLS058 New Prestripping Section of the MILAC Linear Accelerator Designed for Accelerating a High Current Beam of Light Ions ion, focusing, heavy-ion, controls 1627
 
  • A.P. Kobets, V.A. Bomko, O.F. Dyachenko, Ye.V. Ivakhno, M.S. Lesnykh, Z.O. Ptukhina, V.N. Reshetnikov, S.S. Tishkin, V.P. Yashin, A.V. Zabotin, B.V. Zajtsev, V.G. Zhuravlev
    NSC/KIPT, Kharkov
  In the Kharkov Institute of Physics and Technology, the works on construction of a new prestripping section of the multicharge ion linear accelerator (MILAC) is performed. The task is set to provide acceleration of high current beams of light ions for research works on radiation material engineering and applied investigations. The new prestripping section is designed for accelerating ions with A/q=4 up to the energy of 1 MeV/u; after stripping they will be accelerated in the main section up to the energy of 8.5 MeV/u. Special operational mode will allow to increase noticeably the repetition rate with the same power consumption. The calculation results on beam dynamics in the structure with alternating phase focusing in the version with the stepped change of the synchronous phase, and calculations of electrodynamic characteristics of the accelerating structure of the interdigital type. The peculiarities of the construction of the accelerating structure are described.  
 
TUPLS071 Minimum Cost Lattices for Nonscaling FFAGs lattice, LEFT, closed-orbit, quadrupole 1660
 
  • S.R. Koscielniak
    TRIUMF, Vancouver
  Previously, linear-field FFAG lattices for muon acceleration have been optimized under the condition of minimum path length variation. For non-relativistic particles, as are employed in the hadron therapy of cancer, that constraint is removed allowing a wider range of design choices. We adopt the thin-element kick model for a degenerate F0D0 cell composed of D and F combined function magnets. The dipole field components are parametrised in terms of the bending at the reference momentum and the reverse bend angle. The split between positive and negative bending sets the shape of the closed orbits. The cost function, based on stored magnetic energy, is explored in terms of the split. Two cost minima are found, one corresponding to minimum peak magnet field in the F element, and another to minimum radial aperture in the D element. Analytic formulae are given for the minimization conditions. The minimum field lattice is similar to existing designs based on minimizing the path length variation, but the minimum aperture lattice presents a new direction for future detailed design studies.  
 
TUPLS072 Nonscaling FFAG with Equal Longitudinal and Transverse Reference Momenta lattice, closed-orbit, radio-frequency, controls 1663
 
  • S.R. Koscielniak
    TRIUMF, Vancouver
  An unusual feature of linear-field nonscaling FFAG designs is that the radio-frequency is not necessarily synchronous with the reference orbit and momentum chosen for the lattice design. This arises because optics design prefers the reference geometry to be composed of straight lines and arcs of circles - either at the mean momentum, or at high momentum to centre the orbit in the F element. The asynchronous acceleration proposed for rapid acceleration has strong requirements to set the longitudinal reference at 1/4 and 3/4 of the momentum range to minimize phase slip. The usual particle-tracking programs, such as MAD, though sophisticated in the transverse plane, are far cruder in their longitudinal working and do not allow for a longitudinal reference momentum and RF phase independent of the transverse values. In the context of a thin-element lattice model, we show how to make the transverse reference momentum and optic design coincident with the longitudinal reference by adjusting the ratio of positive and negative bending in the D and F elements, respectively, and retaining a lines and arcs composition for the reference orbit. This prepares the way for MAD tracking.  
 
TUPLS075 Design of the Flat-top Acceleration Cavity for the LNS Superconducting Cyclotron resonance, cyclotron, extraction, simulation 1669
 
  • L.A.C. Piazza, D. Battaglia, L. Calabretta, A.C. Caruso, F. Consoli, M.M. Maggiore, D. Rifuggiato, A. Spartà
    INFN/LNS, Catania
  A 3rd harmonic Flat-top acceleration system for the K800 Superconducting Cyclotron of the Laboratori Nazionali del Sud (LNS) was designed to reduce the energy spread of the accelerated particles and to improve the beam quality and the extraction efficiency. The Flat-top effect is realized by the superposition of the 3rd harmonic to the fundamental acceleration frequency. The 3rd harmonic frequency is produced by an additional resonator, capacitively coupled to the K 800 cavities. The Flat-top cavity was designed with the 3D electromagnetic codes Ansoft HFSS and CST MicroWaveStudio.  
 
TUPLS079 Hadron Cancer Therapy Complex Employing Non-scaling FFAG Accelerator and Fixed Field Gantry Design extraction, kicker, proton, resonance 1681
 
  • E. Keil
    CERN, Geneva
  • A. Sessler
    LBNL, Berkeley, California
  • D. Trbojevic
    BNL, Upton, Long Island, New York
  Non-scaling FFAG rings for cancer hadron therapy offer reduced physical aperture and large dynamic aperture as compared with scaling FFAGs. The variation of tune with energy implies the crossing of resonances during acceleration. Our design avoids intrinsic resonances, although imperfection resonances must still be crossed. We consider a system of three non-scaling FFAG rings for cancer therapy with 250 MeV protons and 400 MeV/u carbon ions. Hadrons are accelerated in a common RFQ and linear accelerator, and injected into the FFAG rings at v/c=0.1128. The H+/C6+ ions are accelerated in the two smaller/larger rings to 31 and 250 MeV/52.5 and 400 MeV/u kinetic energy, respectively. The lattices consist of symmetrical triplet cells with a straight section for RF cavities. The gantry with similar triplet cells accepts the whole required momentum range at fixed field. This unique design uses either High Temperature super-conductors or super-conducting magnets reducing gantry size and weight. Elements with a variable field at the beginning and at the end set the extracted beam at the correct position for the specific energy and adapt the beam to specific requirements during treatment.  
 
TUPLS080 The Proposed 2 MeV Electron Cooler for COSY-Juelich electron, COSY, gun, target 1684
 
  • J. Dietrich
    FZJ, Jülich
  • V.V. Parkhomchuk
    BINP SB RAS, Novosibirsk
  The design, construction and installation of a 2 MeV electron cooling system for COSY-Juelich is proposed to further boost the luminosity even with strong heating effects of high-density internal targets. In addition the design of the 2 MeV electron cooler for COSY is intended to test some new features of the high energy electron cooler for HESR at FAIR/GSI. The design of the 2 MeV electron cooler will be accomplished in cooperation with the Budker Institute of Nuclear Physics in Novosibirsk, Russia. Starting with the boundary conditions of the existing electron cooler at COSY the requirements and a first general scheme of the 2 MeV electron cooler are described.  
 
TUPLS084 Estimation of Decay Losses and Dynamic Vacuum for the Beta-beam Accelerator Chain ion, vacuum, SPS, proton 1696
 
  • M. Benedikt, A. Fabich
    CERN, Geneva
  • M. Kirk, C. Omet, P.J. Spiller
    GSI, Darmstadt
  The beta-beam is based on the acceleration and storage of radioactive ions. Due to the large number of ions required and their relatively short lifetime, beam losses are a major concern. This paper estimates the decay losses for the part of the accelerator chain comprising the CERN PS and SPS machines. For illustration purposes, the power deposition in these accelerators is compared to that expected for nominal CNGS proton operation. The beam losses induced vacuum dynamics is simulated and the consequences for machine operation are discussed.  
 
TUPLS089 Pseudospark-sourced Beams of Electrons and Ions electron, cathode, brightness, ion 1711
 
  • A.W. Cross, W. He, A. Phelps, K. Ronald, H. Yin
    USTRAT/SUPA, Glasgow
  A pseudospark discharge has undergone intensive studies with regard to its unusual and interesting discharge properties during last fifteen years. The pseudospark attracts significant attention from diverse fields such as pulsed-power switching, electron beam generation, free electron masers, ion beam generation, extreme-ultraviolet radiation sources, microthrusters and pseudospark-triggered wakefield acceleration. This paper will present experiments and measurements of pseudospark-sourced electron and ion beams for accelerators. Pulsed electron beams with current intensity over 108 Am-2, high brightness up to 1012A m-2 rad-2 and emittance of tens of mm mrad were produced from a multi-gap pseudospark discharge. The transportation of the pseudospark electron beams is also investigated in order to produce high peak current, high quality, short (~100 picosecond) or long duration (2~100ns) high-brightness electron beam pulses. Recent results from a high current density pseudospark-produced ion beam experimentally investigated with hydrogen gas will be presented.  
 
WEPCH036 Design of Short Bunch Compressors for the International Linear Collider emittance, linac, damping, optics 1999
 
  • E.-S. Kim
    PAL, Pohang, Kyungbuk
  We present a two-stage bunch compressor system that was selected as alternative design in the ILC BCD (baseline configuration design). Initial beam with bunch length of 6 mm rms can be compressed to 150 micron rms in the bunch compressor, but the system uses a single chicane for each stage of compression, rather than the 12 chicanes used in the baseline design. We present the design scheme and performances of the system in detail, including scheme for emittance tuning in the system.  
 
WEPCH068 6-D Beam Dynamics Studies in EMMA FFAG LEFT, dipole, electron, quadrupole 2080
 
  • F. Meot
    CEA, Gif-sur-Yvette
  Extensive simulations of 6-D transmission simulations in linear, non-scaling FFAGs, based on gutter rapid acceleration, are reported. They concern two different on-going projects: the 20~GeV muon accelerators in the Neutrino Factory (NuFact) with ISS parameters* and a 20~MeV electron model of these machines, EMMA**.

*http://www.hep.ph.ic.ac.uk/iss/**http://hepunx.rl.ac.uk/uknf/wp1/emodel/

 
 
WEPCH082 Simulation of Ions Acceleration and Extraction in Cyclotron C400 resonance, ion, cyclotron, extraction 2113
 
  • Y. Jongen, W.J.G.M. Kleeven
    IBA, Louvain-la-Neuve
  • G.A. Karamysheva, S.A. Kostromin, N.A. Morozov, E. Samsonov
    JINR, Dubna, Moscow Region
  The Belgian company IBA, together with scientists of the JINR in Dubna is designing a superconducting isochronous cyclotron for therapy by Carbon beams. The new cyclotron C400 has to deliver carbon ions with energy 400 MeV/amu and protons with energy close to 250 MeV. The cyclotron has a compact type superconducting magnet, with a pole radius of 187 cm. The axial focusing is provided by four sectors, with a spiral angle increasing to a maximum value close to 70° at maximum energy. With this design, an axial betatron frequency is maintained during most of the acceleration. The beam acceleration is provided by two spiral dees located in opposite valleys. The dee voltage increases from 100 kV at the center to 200 kV at extraction. The paper presents the analysis of the beam acceleration in the proposed new cyclotron. During the acceleration, several resonance lines are crossed, but the paper demonstrates that this resonance crossing is done without damaging the beam properties. Extraction of the Carbon ions is done by an electrostatic deflector, followed by magnetic correctors. Protons are extracted at lower energy by stripping 2H+1 ions.  
 
WEPCH115 Numerical Simulation and Optimization of a 3-GHz Chopper/Prebuncher System for the S-DALINAC electron, impedance, simulation, MAMI 2185
 
  • N. Somjit, W.F.O. Müller, T. Weiland
    TEMF, Darmstadt
  • R. Eichhorn, J. Enders, H.-D. Gräf, C. Heßler, Y. Poltoratska, A. Richter
    TU Darmstadt, Darmstadt
  A new source of polarized electrons with an energy of 100 keV is presently being developed at the superconducting Darmstadt electron linear accelerator S-DALINAC for future nuclear- and radiation-physics experiments. The pulsed electron beam emitted by the photocathode will be cut to 50 ps by a chopper operated at 3 GHz, and further bunch compression down to 5 ps will be achieved by a two-stage prebuncher section. The chopper-prebuncher system is based on similar devices used at the Mainz Mikrotron (MAMI) where the accelerator frequency is slightly smaller (2.4 GHz). For the chopper, a cylindrical resonator operating at TM110 mode is selected to deflect the electron beam onto an ellipse, i.e., both horizontally and vertically. This is simply achieved by particular slits on both ends of the resonator. The prebunching system consists of two cavities. For increasing the longitudinal capture efficiency, the first cavity will be operated at the fundamental accelerator frequency of the S-DALINAC of 3 GHz, and the second cavity at 6 GHz. The cavities are designed to work at the TM010 mode and TM020 mode for the fundamental and first harmonic, respectively.  
 
WEPCH127 Analysis of Radiative Effects in the Electron Emission from the Photocathode and in the Acceleration inside the RF Cavity of a Photoinjector using the 3D Numerical Code RETAR electron, radiation, extraction, brightness 2221
 
  • V. Petrillo, C. Maroli
    Universita' degli Studi di Milano, Milano
  • G. Alberti
    Università degli Studi di Milano, Milano
  • A. Bacci, A.R. Rossi, L. Serafini
    INFN-Milano, Milano
  • M. Ferrario
    INFN/LNF, Frascati (Roma)
  The three-dimensional fully relativistic and self-consistent code RETAR has been developed to model the dynamics of high-brightness electron beams and in particular to assess the importance of the retarded radiative part of the emitted electromagnetic fields in all conditions where the electrons experience strong accelerations. In this analysis we evaluate the radiative energy losses in the electron emission process from the photocathode of an injector, during the successive acceleration of the electron beam in the RF cavity and the focalization due to the magnetic field of the solenoid, taking also into account the e.m. field of the laser illuminating the cathode. The analysis is specifically carried out with parameters of importance in the framework of the SPARC and PLASMONX projects.  
 
WEPCH134 Development of Code for Simulation of Acceleration of Ions from Internal Source to End of Extraction System in Cyclotrons and Preliminary Design Study of 8MeV Cyclotron for Production of Radioisotopes cyclotron, extraction, simulation, ion 2236
 
  • S.A. Kostromin
    JINR, Dubna, Moscow Region
  From the users' point of view modern cyclotrons must be compact, energy-saving, low-radiation and very reliable facilities. To provide all these characteristics, a very detailed design study of all systems of an accelerator under development is required. Thus, particle tracking from the "beginning" to the "end" in modern cyclotrons with small gaps in the main acceleration region and with efficient extraction systems becomes a very important task for designers. Codes for beam dynamics simulation at the center, main acceleration region and through the extraction system of the cyclotron have been developed. It is possible to monitor all main beam parameters at the different stages of acceleration, radial, axial and phase motion of the beam and the energy increase. During tracking particles through the extraction system it is possible to calculate rms envelopes of radial and vertical motion of the beam and beam losses at the aperture of the extraction system elements. A preliminary design of a compact 8-MeV proton cyclotron was studied using created codes. The accelerator is supposed to have a four sector compact magnet system with the pole 64 cm in diameter.  
 
WEPCH155 Tune-stabilized Linear-field FFAG for Carbon Therapy extraction, injection, focusing, multipole 2290
 
  • C. Johnstone
    Fermilab, Batavia, Illinois
  • S.R. Koscielniak
    TRIUMF, Vancouver
  The simplicity, smaller aperture, and reduced ring size associated with linear-field, nonscaling FFAGs have made them attractive to investigate for a broad range of applications. Significant progress has recently been made towards understanding and modeling this new type of accelerator. The merits, drawbacks and challenges of the linear-field FFAG are discussed here, in particular its suitability for proton and carbon cancer therapy as compared with conventional synchrotrons and cyclotrons. Specifically, tune stabilization and dynamic aperture, a problem with both scaling and non-scaling FFAGs, will be addressed in detail.  
 
WEPCH161 The FFAG R&D and Medical Application Project RACCAM lattice, proton, electron, synchrotron 2308
 
  • F. Meot
    CEA, Gif-sur-Yvette
  • B. Autin, J. Collot, J.F. Fourrier, E. Froidefond, F. Martinache
    LPSC, Grenoble
  • J.L. Lancelot, D. Neuveglise
    SIGMAPHI, Vannes
  The RACCAM project (Recherche en ACCelerateurs et Applications Medicales) has recently obtained fundings, extending over three years (2006-2008), from the French National Research Agency (ANR). RACCAM is a tripartite collaboration, involving (i) the CNRS Laboratory IN2P3/LPSC, (ii) the French magnet industrial SIGMAPHI, and (iii) the nuclear medecine Departement of Grenoble Hospital. The project concerns fixed field alternating gradient accelerator (FFAG) research on the one hand, and on the other hand their application as hadrontherapy and biology research machines. RACCAM's goal is three-fold, (i) participate to the on-going international collaborations in the field of FFAGs and recent concepts of "non-scaling" FFAGs, with frames for instance, the Neutrino Factory (NuFact) and the EMMA project of an electron model of a muon FFAG accelerator, (ii) design, build and experiment a prototype of an FFAG magnet proper to fulfil the requirements of rapid cycling acceleration, (iii) develop the concepts, and show the feasibility, of the application of such FFAG beams to hadrontherapy and to biology research.

*CEA/DAPNIA and IN2P3/LPSC **IN2P3/LPSC ***Grenoble University Hospital ****SIGMAPHI

 
 
WEPCH169 Alternating Phase Focused IH-DTL for Heavy-ion Medical Accelerators linac, ion, rfq, emittance 2328
 
  • Y. Iwata, T. Fujisawa, T. Furukawa, S. H. Hojo, M. Kanazawa, N. M. Miyahara, T. Murakami, M. Muramatsu, K. Noda, H. Ogawa, Y. S. Sakamoto, S. Yamada, K. Yamamoto
    NIRS, Chiba-shi
  • T. Fujimoto, T. Takeuchi
    AEC, Chiba
  • T. Mitsumoto, H. Tsutsui, T. Ueda, T. Watanabe
    SHI, Tokyo
  Tumor therapy using HIMAC has been performed at NIRS since June 1994. With the successful clinical results over more than ten years, a number of projects to construct these complexes have been proposed over the world. Since existing heavy-ion linacs are large in size, the development of compact linacs would play a key role in designing compact and cost-effective complexes. Therefore, we developed an injector system consisting of RFQ and Interdigital H-mode (IH) DTL having the frequency of 200 MHz. The injector system can accelerate carbon ions up to 4.0 AMeV. For the beam focusing of IH-DTL, the method of Alternating Phase Focusing (APF) was employed. With the IH structure and rather high frequency, the cavity size is compact; the radius is 0.4 m, and lengths of RFQ and IH-DTL are 2.5m and 3.5m respectively. The fabrication of RFQ was completed, and we succeeded to accelerate carbon ions with satisfactory performances. For IH-DTL, the full-scale model was first fabricated. With the encouraging result* of its electric field measurement, we constructed IH-DTL and beam acceleration tests will be performed in March 2006. We will present the performances of the entire injector system.

*Y. Iwata et al., Nucl Instr. & Meth in Phys. Res. A (submitted).

 
 
WEPCH175 Design of 12 MEV RTM for Multiple Applications linac, electron, radiation, microtron 2340
 
  • A.V. Poseryaev, V.I. Shvedunov
    MSU, Moscow
  • M.F. Ballester, Yu.A. Kubyshin
    UPC, Barcelona
  Design of a compact 12 MeV race-track microtron (RTM) is described. The results of operating wavelength choice, accelerating structure and end magnets optimization and beam dynamics simulation are represented. Use of a C-band linac and rare earth permanent magnet end magnets permit to design RTM, which is more compact and more effective as compared with the same energy circular microtron or linac. Electron beam with energy 4-12 MeV in 2 MeV step can be extracted from RTM. The estimated pulsed RF power required for feeding the linac is about 800 kW, total mass of accelerator is less than 40 kg and its dimensions are about 500x200x110 mm3.  
 
WEPCH186 Present Status of FFAG Accelerators in KURRI for ADS Study controls, booster, proton, ion 2367
 
  • M. Tanigaki, M. Inoue, K. Mishima, S. Shiroya
    KURRI, Osaka
  • S. Fukumoto, Y. Ishi
    Mitsubishi Electric Corp, Energy & Public Infrastructure Systems Center, Kobe
  • S. Machida
    CCLRC/RAL/ASTeC, Chilton, Didcot, Oxon
  • Y. Mori
    KEK, Ibaraki
  KART (Kumatori Accelerator driven Reactor Test) project is in progress at the Kyoto University Research Reactor Institute (KURRI) since fiscal year 2002. We are now constructing a 150 MeV proton FFAG accelerator complex as a neutron production driver for this project. The whole of this FFAG complex is expected to be in the test operation around the spring in 2006. The developments and the current status of this accelerator complex, including the current status of this project, will be presented.  
 
WEPCH191 The Design and Manufacture of a 300 keV Heavy Ion Implanter for Surface Modification of Materials ion, ion-source, target, extraction 2382
 
  • J.S. Lee, Jae-Keun Kil. Kil, C.-Y. Lee
    KAERI, Daejon
  A 300keV ion implanter has been designed for studies of surface modification of several materials by ion beam. The purpose of design is domestic development of the basic technology for the high energy ion implanter. The main point of design is production, acceleration and transportation of high nitrogen ion beam current up to 5mA and ion energy up to 300keV. 300keV ion implanter consists of Duo-PIGatron ion source, einzel lens, mass separation magnet, acceleration tube, magnetic quadrupole doublet, electrostatic scanner and target. Beam optics design carried out where space charge effect in the acceleration tube and second order aberrations in the mass separation magnet were considered. The mass numbers range from 1 to 140 and the resolving power M/ΔM is 131. Implanter control system includes fiber optics links for the monitoring and control of the ion source parameters in the high voltage zone and computer system for the characterization of the ion beam and whole control of an implantation process.  
 
WEPLS005 The Target Drive for the MICE Experiment target, insertion, vacuum, controls 2403
 
  • C.N. Booth, L.C. Howlett, P.J. Smith
    Sheffield University, Sheffield
  • N. Schofield
    University of Manchester, School of Electrical and Electronic Engineering, Manchester
  The MICE experiment requires a beam of low energy muons to test muon cooling. This beam will be derived parasitically from the ISIS accelerator. A novel target mechanism is being developed which will allow the insertion of a small titanium target into the proton beam halo on demand. The target must remain outside the beam envelope during acceleration, and then overtake the shrinking beam envelope to enter up to 5 mm into the beam during the last 2 ms before extraction. The technical specifications are demanding, requiring large accelerations and precise and reproducible location of the target each cycle. The mechanism must operate in a high radiation environment, and the moving parts must be compatible with the stringent requirements of the accelerator's vacuum system. A prototype linear electromagnetic drive has been built, and the performance is being measured and improved to meet the design specifications. Details of the drive, position readout and control systems will be presented, together with the performance achieved to date.  
 
WEPLS017 International Scoping Study of a Future Accelerator Neutrino Complex factory, proton, target, linac 2427
 
  • M.S. Zisman
    LBNL, Berkeley, California
  The ISS, launched at NuFact05 to evaluate the physics case for a facility, along with options for the accelerator complex and detectors, is laying the foundations for a subsequent conceptual-design study. It is hosted by RAL and organized by the international community, with participants from Europe, Japan, and the U.S. Here we cover work of the Accelerator Group. For the 4 MW proton driver, we consider linacs, synchrotrons, and FFAG rings. For targets, issues of both liquid-metal and solid materials are examined. For beam conditioning (phase rotation, bunching, and ionization cooling), we evaluate schemes with and without cooling, the latter based on scaling FFAG rings. For acceleration, we examine scaling FFAGs and hybrid systems comprising linacs, dogbone RLAs, and non-scaling FFAGs. For the decay ring we consider racetrack and triangular shapes, the latter capable of simultaneously illuminating two different detectors at different baselines. Comparisons are made between various technical approaches to identify optimum design choices for the facility.  
 
WEPLS019 Parameters for Absorber-based Reverse Emittance Exchange of Muon Beams emittance, collider, betatron, scattering 2433
 
  • R.P. Johnson
    Muons, Inc, Batavia
  • Y.S. Derbenev
    Jefferson Lab, Newport News, Virginia
  The normalized longitudinal emittance of a muon beam after six-dimensional ionization cooling appears very small compared to the value that could be utilized or maintained after acceleration to muon collider energy. This circumstance offers the possibility for further reduction of the transverse emittance by introducing absorber-based reverse emittance exchange (REMEX) between longitudinal and transverse degrees of freedom before acceleration to high energy. REMEX follows Parametric-resonance Ionization Cooling and is accomplished in two stages. In the first stage the beam is stretched to fill the RF bucket at the initial cooling energy. In the second stage the beam is accelerated to about 2.5 GeV, where energy straggling begins to limit the absorber technique, and stretched again. The potential transverse emittance reduction and the intrinsic limitations of the REMEX technique have been analyzed earlier. In this report, we describe the required beam transport and RF parameters needed to achieve the maximum REMEX effect.  
 
WEPLS028 Improvement of Electron Generation from a Laser Plasma Cathode through Modified Preplasma Conditions Using an Artificial Prepulse laser, electron, plasma, cathode 2448
 
  • K. Kinoshita, T. Hosokai, K. Kobayashi, A. Maekawa, T. Ohkubo, T. Tsujii, M. Uesaka
    UTNL, Ibaraki
  • A. Yamazaki
    KURRI, Osaka
  • A.G. Zhidkov
    NIRS, Chiba-shi
  We have been studying the effects of laser prepulses, plasma cavity formation, wave breaking processes in the laser plasma acceleration. It is important to control the preplasma conditions, so as to stabilize the laser plasma acceleration. The modification of the conditions of the laser plasma interaction through an artificial prepulse, magnetic fields, and/or gas density modulation will affect on the characteristics of accelerated electron beams. As the first step, we carry out experiments with an artificial prepulse. If a shockwave driven by the artificial prepulse matches the main pulse foccal position, localized wave breaking may occur effectively, and consequent electron generation will be enhanced. We use a pulse with 10% energy of the main pulse and 300 ps duration to be focused on the interaction point of the gas jet, to change the plasma distribution there. Using the single-shot diagnosis, we investigate the mechanism and technique to improve the properties of electron beams. We observed a strong correlation between the generation of monoenergetic electrons and optical guiding of the main pulse, during the interaction of 11 TW 37 fs laser pulse and He gas jet.  
 
WEPLS038 Design of Diamond-lined Accelerator Structure Test Cavity DIAMOND, collider, CLIC, linear-collider 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.  
 
WEPLS040 Progress towards an Experimental Test of an Active Microwave Medium Based Accelerator electron, laser, resonance, controls 2463
 
  • A. Kanareykin
    Euclid TechLabs, LLC, Solon, Ohio
  • P. Schoessow
    Tech-X, Boulder, Colorado
  • L. Schächter
    Technion, Haifa
  We have been working on an experimental test of the PASER concept, where an active medium is used to provide the energy for accelerating charged particles. Initial theoretical work in this area focused on acceleration at optical frequencies; however we have identified a candidate active material operating in the X-band: a solution of fullerene (C60) in a nematic liquid crystal has been found to exhibit a maser transition* in this frequency range. The ability to employ a microwave frequency material simplifies the construction of test structures and allows beam experiments to be performed with relatively large beam emittances. We will report results on synthesis and testing of the active material using EPR spectroscopy, design and numerical simulations of bench test structures and plans for future beam experiments.

*A. Blank et al. IEEE Trans. Microwave Theory and Techniques 46 (2137) 1998.

 
 
WEPLS063 Laser Driven Linear Collider laser, radiation, collider, electron 2523
 
  • A.A. Mikhailichenko
    Cornell University, Department of Physics, Ithaca, New York
  We represent the details of scheme allowing long term acceleration with >10GeV/m. The basis of the scheme is a fast sweeping device for laser bunch. After sweeping the laser bunch has a slope with respect to the direction of propagation. So the every cell of accelerating structure becomes illuminated locally only for the moment, when the particle is there. Self consistent parameters allow considering this type of collider as a candidate for post-ILC era.  
 
WEPLS078 Design Study of the 30 MeV Cyclotron Magnet cyclotron, extraction, proton, injection 2559
 
  • J. Kang, D.H. An, J.-S. Chai, H.S. Chang, H.B. Hong, M.G. Hur, I.S. Jung, Y.-S. Kim, T.K. Yang
    KIRAMS, Seoul
  Korea Institute of RAdiological & Medical Sciences (KIRAMS) has been developing a 30 MeV cyclotron that is planned to be installed at Advanced Radiation Technology Institute, Jeongeup in late 2006. The AVF (Azimuthally Varying Field) magnet of the cyclotron was designed to produce 15-30 MeV proton beam with movable stripper foil. Four directions of extractions are available with two switching magnets. The overall shape of the magnet is cylindrical. The magnet has three kinds of holes for beam injection, vacuum pumps and RF system. The valley and hill gap ratio is about 20 for higher axial focusing. The designed magnet model and its magnetic properties of the KIRAMS-30 are presented.  
 
THPPA02 High-Gradient Superconducting Radiofrequency Cavities for Particle Acceleration TESLA, DESY, XFEL, radio-frequency 2752
 
  • L. Lilje
    DESY, Hamburg
  The development of radiofrequency superconductivity for particle acceleration has reached a level where many projects consider its use. One of the many attractive features of these accelerating structures is to achieve very high accelerating fields efficiently. The technology has been developped to a stage where accelerating gradients of more than 25 MV/m are being implemented in accelerator modules. In single-cell test resonators even higher gradients were already achieved. To operate cavities at these gradients efficiently their frequency needs to be kept stable to reduce the need for an overhead in radiofrequency power. Introducing active elements like piezoelectric actuators allows to achieve these goals.  
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THPCH083 A Tune Feedback System for the HERA Proton Storge Ring coupling, quadrupole, proton, feedback 2979
 
  • S.G. Brinker, S.W. Herb, F.J. Willeke
    DESY, Hamburg
  • Th. Lohse
    Humboldt University Berlin, Institut für Physik, Berlin
  The transverse tunes of an accelerator or storage ring are important parameters which have to be controlled and adjusted continuously during beam operation in order to assure good experimental background conditions. For the HERA proton storage ring, persistent current effects of the superconducting magnets are the main source for the inadequate repeatability of the tunes without a feedback while the proton beam is accelerated. A tune feedback has been developed, implemented and tested during beam acceleration and luminosity operation. Considering the different conditions during energy ramps and luminosity runs two versions of this feedback system have been established based on different correction and peak-finding algorithms (e.g. wavelet analysis). No additional excitation is needed on top of the standard tune indication system in HERA. The tunes could be kept constant during beam accceleration with a standard deviation of delta Q = 0.003. In luminosity runs where the tune control is more critical, first tests resulted in a standard deviation which was a factor of ten smaller. The feedback system is implemented as a standard tool for beam acceleration.  
 
THPCH094 Fully Digitized Synchronizing and Orbit Feed-back Control System in the KEK Induction Synchrotron induction, controls, synchrotron, KEK 3012
 
  • K. Torikai, Y. Arakida, Y. Shimosaki, K. Takayama
    KEK, Ibaraki
  A concept of "Induction Synchrotron", where an extremely long bunch captured by the step barrier-voltages is accelerated with the induction accelerating voltage, is being to be fully demonstrated in the KEK 12GeV-PS for the first time*. Attractive applications of the induction synchrotron are such as higher intensity proton drivers, future high luminosity hadron colliders with superbunch, and arbitral-ion accelerators. Synchronization between the voltage-pulse generation and the beam circulation, accelerating voltage control, and beam-orbit control without beam-rf phase, which is analogous to Delta-R feedback in an RF synchrotron, are indispensable in the induction synchrotron. A fully digitized real-time pulse density and discrete timing control system with 1GHz DSPs has been newly developed. Notable characteristics of the control system, some of which are synchronization at 1MHz revolution frequency with 8ns timing accuracy, are explained in detail. Experimental results of the induction acceleration with the digital orbit controller are also presented in this paper.

*K. Torikai et al. "Acceleration and Confinement of a Proton Bunch with the Induction Acceleration System in the KEK Proton Synchrotron", submitted to Phys.Rev.ST-AB(2005), KEK-Preprint 2005-80.

 
 
THPCH180 Equipment for Tunnel Installation of Main and Insertion LHC Cryo-magnets LHC, monitoring, dipole, quadrupole 3218
 
  • K. Artoos, S. Bartolome-Jimenez, O. Capatina, T. Feniet, J.L. Grenard, M. Guinchard, K. Kershaw
    CERN, Geneva
  The installation of about 1700 superconducting dipoles and quadrupoles in the Large Hadron Collider (LHC) is now well underway. The transport and installation of the LHC cryo-magnets in the LEP tunnels originally designed for smaller, lighter LEP magnets have required development of completely new handling solutions. The severe space constraints combined with the long, heavy loads have meant that solutions had to be very sophisticated. The paper describes the procedure of the installation of the main cryo-magnets in the arc as well as the more specific insertion cryo-magnets. The logistics for the handling and transport are monitored with tri-axial acceleration monitoring devices that are installed on each cryo-magnet to ensure their mechanical and geometric integrity. These dynamic results are commented. The paper includes conclusions and some lessons learned.  
 
THPCH184 Handling and Transport of Oversized Accelerator Components and Physics Detectors CERN, LHC, monitoring, site 3230
 
  • S. Prodon, C. Bertone, M. Guinchard, P. Minginette
    CERN, Geneva
  For cost, planning and organisational reasons, it is often decided to install large pre-built accelerators components and physics detectors. As a result, on surface, exceptional transports are required from the construction to the installation sites. Such heavy transports have been numerous during the LHC installation phase. This paper will describe the different types of transport techniques used to fit the particularities of accelerators and detectors components (weight, height, acceleration, planarity) as well as the measurement techniques for monitoring and the logistical aspects (organisation with the police, obstacles on the roads, etc). As far as oversized equipment is concerned, the lowering into the pit is challenging, as well as the transport in tunnel galleries in a very scare space and without handling means attached to the structure like overhead travelling cranes. From the PS accelerator to the LHC, handling systems have been developed at CERN to fit with these particular working conditions. This paper will expose the operating conditions of the main transport equipments used at CERN in PS, SPS and LHC tunnels.  
 
FRXAPA01 Neutrino Factories and Beta Beams target, factory, CERN, proton 3616
 
  • M.S. Zisman
    LBNL, Berkeley, California
  The presentation will review the various concepts of Neutrino Factories and Beta Beams and indicate the main challenges in terms of beam performance and technological developments. It will also present the world-wide organization to define and carry out the necessary R&D for component design, beam simulations of facility performance, and benchmarking of key subsystems via actual beam tests. Currently approved subsystem tests include the Muon Ionization Cooling Experiment (MICE), under construction at Rutherford Appleton Laboratory, and the Mercury Intense Target (MERIT) experiment, to be carried out at CERN. The major issues being examined by MICE and MERIT will be described as well as the plans and schedule to address them.  
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