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Paper Title Other Keywords Page
MO204 Status of REX-ISOLDE ion, linac, emittance, injection 18
 
  • O.K. Kester, S. Emhofer, D. Habs, K. Rudolph
    LMU, Garching
  • F. Ames, P. Butler, P. Delahaye, M. Lindroos, T. Sieber, F.J.C. Wenander
    CERN, Geneva
  • R. Repnow, H. Scheit, D. Schwalm, R. von Hahn
    MPI-K, Heidelberg
  After commissioning of the radioactive beam experiment at ISOLDE (REX-ISOLDE) first series of physics experiments in 2002 and 2003 have been performed. The REX-ISOLDE charge state breeder adjusts the charge-to-mass ratio of isotopes from all over the nuclear chart to the LINAC requirements. A variety of isotopes from different mass regions of the nuclear chart have been charge bred with REXEBIS to the required A/q < 4.5. A variety of tests with REXTRAP, REXEBIS and the LINAC structures have been done, in order to study the beam parameters, transmission efficiency and upgrade options. The LINAC now consists of six resonators and one re-buncher cavity. The beam energy, which can be delivered towards the target areas, can be varied between 0.8 and 2.2. An additional boost to 3 MeV/u is now possible because of the upgrade with a 202.56 MHz IH-cavity developed for the MAFF project. In addition experiment using beams from the RFQ at 0.3 MeV/u have been performed for solid state physics experiments. The present status of the projects and the commissioning measurements will be presented.  
Transparencies
 
MOP01 Beam Intensity Adjustment in the RIA Driver Linac ion, linac, focusing, impedance 33
 
  • P.N. Ostroumov, J.A. Nolen, I. Sharamentov
    ANL/Phys, Argonne, Illinois
  • A.V. Novikov-Borodin
    RAS/INR, Moscow
  The Rare Isotope Accelerator Facility currently being designed in the U.S. will use both heavy ion and light ion beams to produce radionuclides via the fragmentation and spallation reactions, respectively. Driver beam power of up to 400 kW will be available so that beam sharing between target stations is a viable option to increase the number of simultaneous users. Using a combination of rf-sweepers and DC magnets the driver beams can be delivered to up to four targets simultaneously. With simultaneous beam delivery to more than one target independent adjustment of the relative beam intensities is essential. To enable such intensity adjustment we propose to use a fast chopper in the Medium Energy Beam Transport (MEBT) section. Several options of fast chopper design are discussed. The MEBT beam optics is being designed to accommodate and match the chopper technical specifications. Possible solutions and performance with the fast chopper are proposed.  
 
MOP15 TRASCO-RFQ as Injector for the SPES-1 Project linac, rfq, focusing, beam-losses 66
 
  • P. Posocco, M. Comunian, A. Pisent
    INFN/LNL, Legnaro, Padova
  • E. Fagotti
    INFN Milano, Milano
  The funded first phase of SPES foresees the realization at LNL of a facility able, on one hand, to accelerate a 10 mA protons beam up to 20 MeV for nuclear studies and, on the other hand, to accelerate a 30 mA protons beam up to 5 MeV for BNCT and preliminary ADS studies. In this two-way facility, the TRASCO RFQ will operate in two different current regimes. Moreover a specific MEBT has to be designed able to match the beam to the following superconducting linac and to deliver a beam with the correct characteristics to the neutron production target for the BNCT studies.  
 
MOP34 Injector Linac Upgrade for the BEPCII Project positron, electron, linac, gun 111
 
  • S.H. Wang
    IHEP Beijing, Beijing
  BEPCII- an upgrade project of Beijing Electron Positron Collider (BEPC) is a factory type of e+e- collider. It requests its injector linac to have the higher beam energy (1.89 GeV) for on-energy injection and the higher beam current (40 mA e+ beam) for higher injection rate (≥50 mA/min). The low beam emittance (1.6 π·mm·mrad for e+ beam, and 0.2 π·mm·mrad for 300 mA e- beam) and low beam energy spread (±0.5%) are also requested to meet the storage ring acceptance. Hence the original BEPC injector linac must be upgraded to have a new electron gun with its complete tuning system, a new positron source with a flux concentrator, a new RF power system with its phasing loops and a new beam tuning system with orbit correction and optics tuning devices. These new components have been designed, fabricated, tested and now being installed in their final positions, which are described in this paper. The beam commissioning is expected to start from the October of 2004.  
Transparencies
 
MOP35 The Research of a Novel SW Accelerating Structure with Small Beam Spot electron, coupling, photon, focusing 114
 
  • X. Yang, H. Chen, Y. Chen, X. Jin, M. Li, H. Lu, Z. Xu
    CAEP/IAP, Mianyang, Sichuan
  A new kind of on-axis coupled biperiodic standing-wave (SW) accelerating structure has been built for a 9 MeV accelerator. The research progress was introduced in this paper, it includes the choice of the accelerating structure, the analysis of electron beam dynamics, the tuning of the cavity, the measurement of the accelerating tube and the powered test. The small beam spot is the most interesting feature of this accelerating structure, the diameter of the beam spot is 1.4 mm. This accelerator has been used for the x photons generation and the x-ray dose rate is about 3400 rad/min/m.  
 
MOP37 Optimization of Positron Capture in NLC positron, electron, injection, emittance 120
 
  • Y.K. Batygin
    SLAC, Stanford
  In the Next Linear Collider design, the positron capture system includes a positron production target, a flux concentrator, and a linac to accelerate positrons up to 1.9 GeV, the injection energy of the positron pre-damping ring. Two schemes for positron production have been studied:
  1. a conventional approach with a 6.2 GeV electron beam interacting with a high-Z target and
  2. polarized positron production using polarized photons generated in a helical undulator by a 150 GeV electron beam which then interact with a positron production target.
The capture system has been optimized to insure high positron yield into the 6-dimensional acceptance of the pre-damping ring. Various parameters affecting the positron capture have been analyzed, including: positron deceleration after the flux concentrator, transverse and longitudinal electron beam sizes for positron generation, energy compression after acceleration, etc. As a result of these optimization studies, the positron yield in the conventional scheme has been increased from 1.0 to at least 1.5 and for the polarized positron scheme from 0.25 to 0.30 while maintaining 60% positron polarization.
 
Transparencies
 
MOP39 Positron Transmission and Polarization in E-166 Experiment positron, polarization, photon, focusing 126
 
  • Y.K. Batygin
    SLAC, Stanford
  The proposed experiment E-166 at SLAC is designed to demonstrate the possibility of producing longitudinally polarized positrons from circularly polarized photons. Experimental set-up utilizes a low emittance 50 GeV electron beam passing through a helical undulator in the Final Focus Test Beam line of SLAC accelerator. Circularly polarized photons generated by the electron beam in undulator hit a target and produce electron-positron pairs. The purpose of post-target optics is to select the positron beam and to deliver it to a polarimeter keeping positron beam polarization as high as possible. Paper analyzes the positron transmission and polarization both numerically and analytically. The value of positron transmission has a maximum of 3% for positron energy of 7 MeV while positron polarization is around 80%.  
 
MOP48 Gamma and X-rays Production for Experiments at ELSA Facility electron, laser, emittance, linac 153
 
  • J. Lemaire
    CEA/DAM, Bruyères-le-Châtel
  The ELSA facility is a high brightness 18 MeV electron source dedicated to electron radiation, gamma-rays and picosecond hard and soft X-rays. It consists of a 144 MHz RF photoinjector producing short bunches which are further accelerated to a final energy varying from 2 to 18 MeV thanks to three 433 MHz RF cavities. Former beam compression design used a half turn magnet compressor system. It has been recently replaced by a double alpha magnet compressor. Electron beams are now delivered to a new experimental room. We present the new panel of interests offered by this facility in term of gamma-ray and X-ray production.  
 
MOP62 Energy Spread in BTW Accelerating Structures at ELETTRA linac, single-bunch, simulation, electron 159
 
  • P. Craievich, R.J. Bakker, G. D'Auria, S.D. Di Mitri
    Sincrotrone Trieste S.C.p.A., Basovizza, Trieste
  The FEL project FERMI@ELETTRA will use the existing 1.0 GeV Linac, based on Backward Travelling Wave (BTW) structures, to produce VUV radiation between 100–10 nm. The project will be articulated in two different phases (100–40 nm/40–10 nm) and will require high quality beam with short bunches (500/160 fsec). Hence, wakefield effects have to be considered with respect to the electron beam quality. The single bunch energy spread induced by the short-range longitudinal wakefield is analyzed and results of start-to-end simulations are reported.  
 
TU104 Developments and Future Plans at ISAC/TRIUMF ion, ion-source, linac, cyclotron 251
 
  • P. Schmor
    TRIUMF, Vancouver
  The ISAC (Isotope Separator and Accelerator) at TRIUMF uses the ISOL (On Line Isotope Separator) technique with up to 100 microA of 500 MeV protons from the TRIUMF cyclotron driver to create exotic isotopes in a thick target. An ion beam formed from these exotic isotopes is transported at 2 keV/u, mass separated, injected into a room temperature RFQ Linac and then into a five-tank drift tube linac that provides variable-energy accelerated exotic-beams from 0.15 to 1.8 MeV/u for nuclear astrophysics experiments. Super conducting rf cavities are presently being added to the linac chain to permit a further increase in the maximum energy of the exotic beams to 6.5 MeV/u. An ECR-based charge state booster is also being added in front of the RFQ to increase the available mass range of the accelerated isotopes from 30 to about 150. A second proton beam line and new target station for target and ion source development have been proposed for ISAC. In the future this new target station could be used as an independent simultaneous source of exotic beams for the experimental program.  
Transparencies
 
TU301 High Power CW Superconducting Linacs for EURISOL and XADS linac, proton, cyclotron, ion 275
 
  • J.-L. Biarrotte
    IPN, Orsay
  A multi-MW superconducting proton linac is proposed as the baseline solution for the EURISOL and the XADS driver accelerators. In the EURISOL project, which studies the design of the next-generation European ISOL facility, it is used to produce both neutron-deficient and neutron-rich exotic nuclei far from the valley of stability. In the PDS-XADS project, which aims to the demonstration of the feasibility of an ADS system for nuclear waste transmutation, it is used to produce the neutron flux required by the associated sub-critical reactor. In this paper, we report the main results and conclusions reached within these preliminary design studies. A special emphasis is given on the on-going and future R&D to be done to accomplish the demonstration of the full technology.  
Transparencies
 
TUP10 Design of a Deuteron RFQ for Neutron Generation rfq, ion, ion-source, proton 312
 
  • Z.Y. Guo, J. Chen, J. Fang, Y.R. Lu, S.X. Peng, Z.Z. Song, J.X. Yu, C. Zhang, K. Zhu
    PKU/IHIP, Beijing
  • A. Schempp
    IAP, Frankfurt-am-Main
  A deuteron RFQ is designed for neutron generation with 9Be(d,n)10B reaction. Considering the limitation of available RF transmitter, the frequency was chosen as 201.5 MHz and the peak RF power was set to 400 kW with 10% duty factor. The deuteron beam will be extracted from an ECR ion source also with 10% duty factor and then be accelerated to about 2 MeV by RFQ with high transmission efficiency. The system will be described and the design results of particle dynamics and structure will be given.  
 
TUP46 A New Control System for the S-DALINAC electron, alignment, diagnostics, beam-losses 372
 
  • M. Brunken, W. Ackermann, A. Araz, U. Bonnes, H.-D. Gräf, M. Hertling, A. Karnaukhov, W.F.O. Müller, O. Patalakha, M. Platz, A. Richter, B. Steiner, O. Titze, B. Truckses, T. Weiland
    TU Darmstadt, Darmstadt
  We will present recent results of the development of a new control system for the superconducting cw electron accelerator S-DALINAC. This system will be based on common industrial standards. Due to the large number of special devices existing to control the beamline, a simple and cheap communication interface is required to replace the current proprietary bus topology. The existing devices will be upgraded by a microcontroller based CAN bus interface as communication path to a control server. The servers themselves may be distributed over the location, giving required applications access to the device parameters through a TCP/IP connection. As application layer protocol for the Client Server communication a special binary protocol and a text protocol based on XML are considered.  
 
TUP61 Beam Analysis Using the IPNS Linac ESEM linac, diagnostics, synchrotron, quadrupole 405
 
  • J.C. Dooling, F. R. Brumwell, L. Donley, G.E. McMichael, V. F. Stipp
    ANL, Argonne, Illinois
  The Energy Spread and Energy Monitor (ESEM) is an on-line, non-intrusive diagnostic used to characterize the output beam from the 200 MHz, 50 MeV linac. The energy spread is determined from a 3-size, longitudinal emittance measurement and energy is derived from TOF analysis. Presently, a single particle distribution is used to yield energy and energy-spread results. Effort is on-going to allow for more realistic distributions to be included. Signals are detected on terminated 50 Ω, stripline BPMs. Each BPM is constructed with four striplines: top, bottom, left and right. Until recently, the ESEM signals were taken solely from bottom striplines in four separate BPM locations in the transport line between the linac and synchrotron. We have begun to use the top stripline data to examine, in more detail, beam position and attempt to measure beam size. The electrostatic coupling between the stripline and the beam depends on the capacitance, which in turn is inversely related to the beam-stripline separation. The electrostatic portion of fluctuations in beam motion will be nonlinear, possibly allowing one to infer beam size.  
 
TUP63 The First Results of Bunch Shape Measurements in SNS Linac electron, emittance, linac, background 408
 
  • A. Feschenko, A. Gaidash, Yu. Kisselev, L.V. Kravchuk, A. Liyu, A. Menshov, A.N. Mirzojan
    RAS/INR, Moscow
  • S. Assadi, W. Blokland, S. Henderson, E.P. Tanke
    ORNL/SNS, Oak Ridge, Tennessee
  • D.-O. Jeon
    ORNL, Oak Ridge
  Three Bunch Shape Monitors with transverse scanning of low energy secondary electrons for the SNS Linac have been developed and fabricated. The peculiarity of the detectors is using of energy separation of the electrons. The separation enables to minimize influence of detached electrons originated from dissociation of H-minus ions in the detector wire target. The first detector was used at the exit of the first DTL tank during its commissioning. The results of Bunch Shape measurements are presented and discussed. These results were used to verify beam quality, to set parameters of the accelerating field, to estimate a longitudinal beam halo and to restore a longitudinal beam emittance.  
Transparencies
 
WE202 Recent Results in the Field of High Intensity CW Linac Development for RIB Production linac, rfq, proton, ion 538
 
  • A. Pisent
    INFN/LNL, Legnaro, Padova
  High Intensity CW Linacs have been proposed as driver accelerators for RIB production in various projects, since thy can drive in steady conditions a MW power range target for the production of spallation neutrons that induce fission in a natural uranium target. Particularly important for this application, with a relatively low beam current, is the necessity to develop a superconducting intermediate energy part with good power conversion efficiency. The second specific requirement of RIB facility drivers, that is also fulfilled by a superconducting intermediate energy linac, is the necessity to keep some flexibility in the species that can be accelerated (deuterons or light ions). In EURISOL RTD project a 1 GeV 5 mA proton linac, has been proposed for this application. In SPES project, recently approved for its initial phase at LNL, a lower energy proton beam will be used on a solid target. The results of the specific R&D programs on in the field of CW RFQ and superconducting low energy linacs will be illustrated. In particular for LNL the status of the RFQ construction and the superconducting cavities prototype tests will be given.  
Transparencies
 
TH102 Overview of High Intensity Linac Programs in Europe linac, proton, rfq, ion 559
 
  • M. Vretenar, R. Garoby
    CERN, Geneva
  Recent years have seen a boost in the European Union (EU) engagement for accelerator research in Europe. Laboratories and institutions from member states are invited to combine their efforts and to define common goals and strategies, in order to receive a financial support up to 50% of the total project cost. In the field of High Intensity Linacs, the EU had already supported the EURISOL initiative for nuclear physics, which this year is applying for funding of a Design Study, and the development of linacs for Waste Transmutation. More recently, an initiative for high-energy physics has been approved, which includes a programme for the development of pulsed linac technologies. Together with the ongoing national projects, these European initiatives represent a strong focussed effort towards the development of linac technologies, intended to overcome difficulties coming from decreasing national budgets. This paper presents a summary of the requests coming from the European physics communities and an overview of linac R&D activities sponsored by the EU, together with some information on parallel national projects. The parameter choices as well as the main technical features of the different projects are presented and compared.  
Transparencies
 
TH203 High Power Targets secondary-beams, proton 583
 
  • H. Kirk
    BNL, Upton, Long Island, New York
  The accelerator physics community is responding to developing theoretical arguments for the search of new physics beyond the Standard Model by conceiving and proposing new high-intensity proton machines in the multi-megawatt class. These new machines will allow for the production of a variety of useful secondary beams but only if the proper target configurations are first developed and then implemented. In this paper, important target issues will be discussed and world-wide approaches and prospects for new targets will be reviewed.  
Transparencies
 
THP07 Performance Improvement of the Multicell Cavity Prototype for Proton LINAC Projects proton, linac, shielding, electron 611
 
  • B. Visentin, D. Braud, J.P. Charrier, B. Coadou, Y. Gasser, J.P. Poupeau, P. Sahuquet
    CEA/DSM/DAPNIA, Gif-sur-Yvette
  • S. Bousson, H. Gassot, H. Saugnac, P. Szott
    IPN, Orsay
  • G. Devanz
    CEA/DAPNIA-SACM, Gif-sur-Yvette Cedex
  The CEA-Saclay/IPN-Orsay collaboration allowed to develop a multicell superconducting cavity prototype (704 MHz, β=0.65). Since the first experimental results[*], achieved in a vertical cryostat and the horizontal one "CryHoLab", the accelerating field Eacc has been recently improved up to 19 MV/m (Epeak = 43 MV/m, Bpeak = 83 mT, Q0 = 9.109). Eacc is now limited by quench. The previous one limitation, due to a non understood phenomenon, disappeared . The excellent performances of this 5-cell proton cavity validate the design, the technological choices, the manufacturing and the cavity preparation process. These results augur well for our future R&D program on multicell superconducting cavities within the European CARE/HIPPI framework.

[*] Proceedings of PAC2003, Portland, USA, TAB047, p.1303

 
 
THP12 Superconducting RFQs in the PIAVE Injector feedback, linac, rfq, cryogenics 623
 
  • G. Bisoffi, G. Bassato, G. Bezzon, A. Calore, S. Canella, F. Chiurlotto, A. Lombardi, P. Modanese, A.M. Porcellato, S. Stark
    INFN/LNL, Legnaro, Padova
  The PIAVE superconducting RFQs were installed on the linac line and connected to the TCF50 cryogenic system. First results on the on-line resonator performance (e.g. Q-curves, amplitude and phase locking) are described as well as the behaviour of the fast tuners.  
 
THP16 Engineering and Cryogenic Testing of the ISAC-II Medium Beta Cryomodule alignment, vacuum, linac, heavy-ion 630
 
  • G. Stanford, Y. Bylinskii, R.E. Laxdal, B. Rawnsley, T. Ries, I. Sekatchev
    TRIUMF, Vancouver
  The medium beta section of the ISAC-II Heavy Ion Accelerator consists of five cryomodules each containing four quarter wave bulk niobium resonators and one superconducting solenoid. A prototype cryomodule has been designed and assembled at TRIUMF. The cryomodule vacuum space contains a mu-metal shield, an LN2 cooled, copper, thermal shield, plus the cold mass and support system. This paper will describe the design goals, engineering choices and fabrication and assembly techniques as well as report the results of the initial cold tests. In particular we will summarize the alignment procedure and the results from the wire position monitoring system.  
 
THP21 Calculation of Electron Beam Dynamics of the LUE-200 Accelerator electron, focusing, quadrupole, simulation 639
 
  • A.P. Sumbaev, V. Alexandrov, N.Y. Kazarinov, V.F. Shevtsov
    JINR, Dubna, Moscow Region
  The results of calculations of the focusing and transportation systems of the electron beam of LUE-200 accelerator – the driver of a pulse source of resonant neutrons IREN, JINR (Dubna), are presented. Simulations of the beam dynamics in the traveling wave accelerator were carried out by means of PARMELA code. The calculations have been fulfilled for various parameters of the focusing magnetic fields in the accelerator and the channel, various currents of the beam and various initial distributions of electrons.  
 
THP30 Production of S-band Accelerating Structures linac, coupling, vacuum, microtron 666
 
  • C. Piel, K. Dunkel, H. Vogel, P. vom Stein
    ACCEL, Bergisch Gladbach
  ACCEL currently produces accelerating structures for several scientific laboratories. Multi-cell cavities at S-band frequencies are required for the projects CLIC-driver-linac, DLS and ASP pre-injector linac and the MAMI-C microtron. Based on those projects differences and similarities in design, production technologies and requirements will be addressed.  
 
THP38 High Precision Survey and Alignment of Large Linear Accelerators alignment, survey, simulation, vacuum 690
 
  • J. Prenting, M. Schlösser
    DESY, Hamburg
  • J. Green, G. Grzelak, A. Mitra, A. Reichold
    OXFORDphysics, Oxford, Oxon
  • A. Herty
    CERN, Geneva
  For the future linear accelerator TESLA the demanded accuracy for the alignment of the components is 0.5 mm horizontal and 0.2 mm vertical, both on each 600 m section. Other accelerators require similar accuracies. These demands can not be fulfilled with open-air geodetic methods, mainly because of refraction. Therefore the RTRS (Rapid Tunnel Reference Surveyor), a measurement train performing overlapping multipoint alignment on a reference network is being developed. Two refraction-free realizations of this concept are being developed at the moment: the first one (GeLiS) measures the horizontal co-ordinates using stretched wires, combined with photogrammetric split-image sensors in a distance measurement configuration. In areas of the tunnel where the accelerator is following the earth curvature GeLiS measures the height using a new hydrostatic leveling system. The second concept (LiCAS) is based on laser straightness monitors (LSM) combined with frequency scanning interferometry (FSI) in an evacuated system. LiCAS measures both co-ordinates with respect to its LSM-beam and is thus suitable for geometrically straight tunnel sections. Both measurement systems will be placed on a train, which could do the reference survey autonomously.  
 
THP65 Low-Power RF Tuning of the Spallation Neutron Source Warm LINAC Structures coupling, linac, pick-up, vacuum 760
 
  • C. Deibele, G. Johnson
    ORNL, Oak Ridge
  • J. Billen, N.K. Bultman, J. Stovall
    LANL, Los Alamos, New Mexico
  • J. Error, P. Gibson
    ORNL/SNS, Oak Ridge, Tennessee
  • J. Manolitsas, D. Trompetter
    ACCEL, Bergisch Gladbach
  • A. Vasyuchenko
    RAS/INR, Moscow
  • L. Young
    TechSource, Santa Fe, NM
  The Spallation Neutron Source (SNS) is an accelerator-based neutron source being built at Oak Ridge National Laboratory. A conventional 402.5 MHz drift-tube linac (DTL) accelerates the beam from 2.5 to 86 MeV, and the 805 MHz coupled-cavity linac (CCL) continues acceleration to 186 MeV. Tuning the six DTL tanks involves adjusting post-coupler lengths and slug tuners to achieve the design resonant frequency and stabilized field distribution. A 2.5 MW klystron feeds RF power into each DTL tank through a ridge-loaded waveguide that does not perturb either the frequency or field distribution in the tank. The CCL consists of 4 RF modules operating in the βλ/2 mode. Each module contains 96 accelerating cavities in 12 segments of 8 cavities each, 11 active bridge coupler cavities, and 106 nominally unexcited coupling cavities. For each RF module, power from a single 5 MW klystron splits once and drives bridge couplers 3 and 9. We will discuss the special tools and measurement techniques developed for the low-power tuning activities.  
 
THP74 Laser Produced Ions as an Injection Beam for Cancer Therapy Facility laser, ion, proton, plasma 782
 
  • A. Noda, M. Hashida, Y. Iwashita, S. Nakamura, S. Sakabe, S. Shimizu, T. Shirai, H. Tongu
    Kyoto ICR, Kyoto
  • H. Daido
    JAERI APRC, Ibaraki-ken
  • A. Fukumi, Z. Li, K. Matsukado
    NIRS, Chiba-shi
  • T. Hosokai, H. Iijima, K. Kinoshita, M. Uesaka, T. Watanabe, K. Yoshii
    UTNL, Ibaraki
  • T. Takeuchi
    DOP Nagoya, Nagoya
  Ion production from a solid target by a high-power short pulse laser has been investigated to replace the injector linac of the synchrotron dedicated for cancer therapy. As the high power laser, the laser with the peak power of 100 TW and minimum pulse duration of 20 fs which has been developed at JAERI Kansai Research Establishment, is assumed. Laser produced ions with 100% energy spread is energy selected within ±5% and then phase rotated with use of the RF electric field synchronized to the pulse laser, which further reduces the energy spread to ±1%. The scheme of the phase rotation is presented together with the experimental results of laser production from the thin foil target.  
 
THP89 Measured RF Properties of the DTL for the J-PARC insertion, linac, synchrotron, quadrupole 809
 
  • H. Tanaka, T. Kato, F. Naito, E. Takasaki
    KEK, Ibaraki
  • H. Asano, T. Morishita
    JAERI, Ibaraki-ken
  • T. Itou
    JAERI/LINAC, Ibaraki-ken
  RF properties of the second DTL tank for J-PARC have been measured in KEK. The required flatness and stability of the accelerating field of the tank have been achieved by the tunung of the post-couplers, whose shape were modified to adjust the resonant frequency ?324 MHz). Because the third DTL tank has assembled, the rf measurement and the post-coupler tuning will be started soon. Thus the measured results for both tanks will be described in the paper.  
 
FR103 Status of the SNS Linac: An Overview linac, laser, proton, rfq 837
 
  • N. Holtkamp
    ORNL, Oak Ridge
  The Spallation Neutron Source SNS is a second generation pulsed neutron source and under construction at Oak Ridge National Laboratory. The SNS is funded by the U.S. Department of Energy?s Office of Basic energy Sciences and is dedicated to the study of the structure and dynamics of materials by neutron scattering. A collaboration composed of six national laboratories (ANL, BNL, TJNAF, LANL, LBNL, ORNL) is responsible for the design and construction of the various subsystems. With the official start in October 1998, the operation of the facility will begin in 2006 and deliver a 1.0 GeV, 1.4 MW proton beam with a pulse length of approximately 700 nanoseconds on a liquid mercury target. The multi-lab collaboration allowed access to a large variety of expertise in order to enhance the delivered beam power by almost an order of magnitude compared to existing neutron facilities. The SNS linac consists of a combination of room temperature and superconducting structures and will be the first pulsed high power sc linac in the world. The challenges and the achievements will be described in the paper.

SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy. SNS is a partnership of six national laboratories: Argonne, Brookhaven, Jefferson, Lawrence Berkeley, Los Alamos and Oak Ridge.

 
Transparencies
 
FR204 The Physics Perspectives at the Future Accelerator Facility FAIR antiproton, ion, synchrotron, hadron 858
 
  • J. Stroth
    GSI, Darmstadt
  The physics perspective of the approved future international accelerator Facility for Anti-proton and Ion Research (FAIR) near Darmstadt, Germany will be outlined. The physics programme will comprise many body aspects of matter ranging from macroscopic system like highly correlated plasmas down to the properties of baryons and nuclear matter at high baryon densities. Through fragmentation of intense ion beams investigations with beams of short-lived radioactive nuclei far from stability will be possible. The addressed physics questions concern nuclear structure at the drip-lines, areas of astrophysics and nucleo-synthesis in supernovae and other stellar processes, as well as tests of fundamental symmetry. The structure of baryons and their limits of their existence is the interest of the two large experimental set-ups PANDA and CBM. Finally QED will be studied in extremely strong field effects and also the interaction of ions with matter. The future facility will feature a double-ring synchrotron SIS100/300 and a system of associated storage rings for beam collection, cooling, phase space optimisation and experimentation.  
Transparencies