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Paper Title Other Keywords Page
MO101 ISAC-II Operation and Future Plans ISAC, linac, ion, TRIUMF 1
  • M. Marchetto
    TRIUMF, Vancouver

The ISAC-II superconducting heavy ion linac now accelerates radioactive ion beams with the highest gradient of any operating SC ion facility in the world and provides a 20 MV boost to the ISAC accelerated beams. The addition of a further 20 MV of SC linac, with cavities made in Canada, will be installed by the end of 2009. The ISAC-III project scheduled to begin in 2010 will see the installation of an additional driver beam of 50 MeV electrons to produce RIBs by photofission, an expanded target area, and new front-end ion accelerators to expand the capability to three simultaneous radioactive beams for experiments.


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MO201 Progress in the Beam Commissioning of J-PARC Linac and its Upgrade Path linac, rfq, cavity, neutron 16
  • M. Ikegami
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken

The beam commissioning of J-PARC linac has been started since November 2006, and the initial commissioning has been completed in September 2007. Since then, the linac beam has been supplied to the succeeding RCS (Rapid Cycling Synchrotron) for its commissioning with occasional linac beam studies for finer tuning. The emphasis of the linac tuning has been shifted to the characterization and stabilization of the beam parameters, and better beam availability has gradually been required for the linac operation. In this paper, we present the current linac performance and operational experience obtained so far after a brief review of the commissioning history. Remaining commissioning tasks and the future upgrade plan to increase the beam power are also discussed.


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MOP002 Injector Development for High Intensity Proton Beams at Stern-Gerlach-Zentrum proton, rfq, space-charge, ion 49
  • O. Meusel, A. Bechtold, L.P. Chau, M. Heilmann, H. Podlech, U. Ratzinger, K. Volk, C. Wiesner
    IAP, Frankfurt am Main

The Frankfurter neutron source at Stern-Gerlach-Zentrum (SGZ) uses a proton injector as a driver for the 7Li(p,n) neutron production. A volume type ion source will deliver a 100 keV, 200 mA proton beam continuously. It is intended to use a LEBT section consisting of four solenoids to transport the beam and to match it into the acceptance of the RFQ. A chopper system between solenoid 2 and 3 will provide beam pulses with a length of about 100 ns with a repetition rate of 250 kHz. The RFQ and the following IH drift tube LINAC will be coupled together to achieve an efficiency beam acceleration. Furthermore only one power amplifier will be needed to provide the rf power for both accelerator stages. The Mobley type bunch compressor will merge 7 micro-bunches formed in the accelerator module to one single 1ns bunch with an estimated peak current of about 8.6 A. A rebuncher will provide the post acceleration at a final beam energy adjustable between 1.8 and 2.4 MeV. The whole injector suffers from the high beam intensity and therefore high space charge forces. It will gives the opportunity to develop new accelerator concepts and beam diagnostic technics.

MOP015 Operational Status and Future Plans for the Los Alamos Neutron Science Center (LANSCE) neutron, proton, linac, scattering 88
  • K.W. Jones, K. Schoenberg
    LANL, Los Alamos, New Mexico

Funding: U. S. Department of Energy, National Nuclear Security Administration, Contract No. DE-AC52-06NA25396
The Los Alamos Neutron Science Center (LANSCE) continues to be a signature experimental science facility at Los Alamos National Laboratory (LANL). The 800 MeV linear proton accelerator provides multiplexed beams to five unique target stations to produce medical radioisotopes, ultra-cold neutrons, thermal and high-energy neutrons for material and nuclear science, and to conduct proton radiography of dynamic events. Recent operating experience will be reviewed and the role of an enhanced LANSCE facility in LANL's new signature facility initiative, Matter and Radiation in Extremes (MaRIE) will be discussed.



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MOP016 Operational Experience of the SNS Front End and Warm Linac linac, cavity, beam-losses, DTL 91
  • A.V. Aleksandrov
    ORNL, Oak Ridge, Tennessee

Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.
The Spallation Neutron Source accelerator complex uses set of pulsed linear accelerators of different types to accelerate beam to 1 GeV. The 2.5 MeV beam from the Front End is accelerated to 86 MeV in the Drift Tube Linac, then to 185 MeV in a Coupled-Cavity Linac and finally to 1 GeV in the Superconducting Linac. In the process of the commissioning and beam power ramp up many technical systems, as well as tuning algorithms, have deviated significantly from the original design. Our understanding of beam behavior has been evolving continuously and resulted in a steady reduction of fractional beam losses in the linac. In the same time new unexpected problems have been discovered, which are still in the process of investigation. In this paper we summarize our experience up to date and report on the current directions of experimental study, simulations, and development of tuning methods.

MOP017 The Proposed ISAC-III (ARIEL) Low-Energy Area and Accelerator Upgrades ISAC, linac, rfq, DTL 94
  • R.E. Laxdal, F. Ames, R.A. Baartman, M. Marchetto, M. Trinczek, F. Yan, V. Zvyagintsev
    TRIUMF, Vancouver

The ISAC-III proposal is a ten year plan to triple the amount of radioactive ion beam (RIB) time at the facility. The plan includes the addition of two new independent target stations with a design suitable for actinide target materials, a second 500 MeV proton beam line from the TRIUMF cyclotron and a new 50 MeV electron linac as a complementary driver to provide RIBs through photo-fission. The two new target stations will require a new mass-separator and low-energy beam-transport complex to deliver the additional beams to the ISAC experimental facilities. It is also proposed to install a new linear accelerator section to provide the capability for two simultaneous accelerated RIBs to experimenters. This paper will describe the proposed installations in the low-energy transport and accelerator sections of the ISAC complex.

MOP021 Towards the Development of Rare Isotope Beam Facility at VECC Kolkata rfq, ion, linac, ion-source 106
  • V. Naik, A. Bandyopadhyay, D. Bhowmick, A. Chakrabarti, M. Chakrabarti, S. Dechoudhury, J.S. Kainth, P. Karmakar, T. Kundu Roy, T.K. Mandi, M. Mondal, H.K. Pandey, D. Sanyal
    DAE/VECC, Calcutta

An ISOL type Rare Isotope Beam (RIB) Facility is being developed at VECC, Kolkata around the existing K=130 room temperature cyclotron. The possibility of using the photo-fission production route using a 50 MeV electron linac is also being explored. The production target and a 6.4 GHz ECR based charge-breeder system will lead to two beam lines. The first one, a low energy beam transport (LEBT) line consisting of a 1.7 m long, 33.7 MHz RFQ, will be dedicated to material science & other ion-beam based experiments. The second, post-acceleration beam line will accelerate the beams to 1.3 MeV/u using a longer, 3.4 m RFQ and a series of IH linear accelerators. In the first stage, the beam energy will be about 400 keV/u using three modules of linacs. Subsequently the energy will be boosted to about 1.3 MeV/u. Some of the systems have already been installed and made operational. The LEBT line has been tested and stable ion beams accelerated to 29 keV/u with high efficiency in the 1.7 m RFQ. The 3.4 m RFQ and the first IH Linac tank are under installation in the post-acceleration beam line. In this contribution an overview of the present status of the facility will be presented.

MOP031 Estimates of Energy Fluence at the Focal Plane in Beams Undergoing Neutralized Drift Compression solenoid, bunching, induction, emittance 133
  • J.J. Barnard
    LLNL, Livermore, California
  • J.E. Coleman, D. Ogata, P.A. Seidl
    LBNL, Berkeley, California
  • D.R. Welch
    Voss Scientific, Albuquerque, New Mexico

Funding: Work performed under the auspices of the U.S. Department of Energy under contract DE-AC52-07NA27344 at LLNL, and University of California contract DE-AC03-76SF00098 at LBNL.
We estimate the energy fluence (energy per unit area) at the focal plane of a beam undergoing neutralized drift compression and neutralized solenoidal final focus, as is being carried out in the Neutralized Drift Compression Experiment (NDCX) at LBNL. In these experiments, in order to reach high beam intensity, the beam is compressed longitudinally by ramping the beam velocity (i.e. introducing a velocity tilt) over the course of the pulse, and the beam is transversely focused in a high field solenoid just before the target. To remove the effects of space charge, the beam drifts in a plasma. The tilt introduces chromatic aberrations, with different slices of the original beam having different radii at the focal plane. The fluence can be calculated by summing the contribution from the various slices. We develop analytic formulae for the energy fluence for beams that have current profiles that are initially either constant or parabolic in time. We compare with envelope and particle-in-cell calculations. The expressions derived are useful for predicting how the fluence scales with accelerator and beam parameters.

MOP044 Status of DPIS Development in BNL laser, plasma, ion, rfq 169
  • M. Okamura
    BNL, Upton, Long Island, New York
  • T. Kanesue
    Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, Fukuoka
  • J. Tamura
    Department of Energy Sciences, Tokyo Institute of Technology, Yokohama

Direct injection scheme was proposed in 2000 at RIKEN in Japan. The first beam test was done at Tokyo Institute of Technology using a CO2 laser and an 80 MHz 4 vane RFQ in 2001, and further development continued in RIKEN. In 2006, all the experimental equipment was moved to BNL and a new development program was started. We report on our recent activities at BNL including the use of a frozen gas target for the laser source, low charge state ion beam production and a newly developed laser irradiation system.

MOP054 Experience with Stripping Carbon Foils in ALPI Super-Conducting Accelerator cavity, ion, linac, focusing 199
  • P.A. Posocco
    Consorzio RFX, Associazione Euratom-ENEA sulla Fusione, Padova
  • D. Carlucci, A. Pisent, M. Poggi, P.A. Posocco
    INFN/LNL, Legnaro, Padova

The superconducting linac ALPI, injected either by a XTU tandem or by the superconducting RFQ of PIAVE, is composed by 3 cryostats of bulk Nb cavities (β=0.056) and 13 cryostats of Nb sputtered on Cu cavities (β=0.11 and β=0.13), for a total of 64 cavities and an equivalent voltage of 35MV. The linac is build up in two branches connected by an achromatic and isochronous U-bend. In January 2007 a stripping station equipped with carbon foils of different thickness was placed after 6 cryostats, before the U-bend, to test the feasibility of acceleration and transport of a charge enhanced beam. The study was performed with 4 different beams (Ca, Ar, Zr and Xe) and a complete data analysis has been carried out.

MOP061 The Feasibility of Low-Energy Electronuclear Power Plant neutron, linac, proton, DTL 217
  • Y.A. Svistunov, M.F. Vorogushin
    NIIEFA, St. Petersburg
  • I.V. Kudinovich
    AN Krylov SRI, St. Petersburg

Funding: Rosatom corp.
There are examined prospects and challengers associated with the development of low-energy electronuclear power plant eliminating any possibility of uncontrolled chain fission reaction through fission in subcritical reactor with an additional neutron source. The neutron source is anticipated to be a heavy-element target irradiated with a beam of protons accelerated to several hundreds of mega-electron-volts. The intensity of external neutron source for an electronuclear reactor rated under 200-400 MW may be much less than for greater ones, and that allows reducing accelerator performances to limits that are already run in the world industry. Potential applications of such electronuclear plants include municipal, industrial and other electricity, and heat supply utilities in remote areas. The same engineering philosophy may be used on solving of the nuclear waste transmutation problem.

MOP063 High-Power Lithium Target for Accelerator-Based BNCT linac, neutron, electron, gun 223
  • C.A. Willis, D.A. Swenson
    Linac Systems, LLC, Albuquerque, New Mexico

A 50 kW, water-cooled conical target for producing neutrons via the Li-7(p,n)Be-7 reaction at 2.5 MeV proton energy is under development at Linac Systems. This target is intended to accept a stationary, expanded CW beam with a diameter of 8 cm directly from an rf linac, resulting in peak surface heat flux of 7.5 MW m-2 (a 'waterbag' beam power distribution is assumed). The target is predicted to meet the intensity requirements for practical accelerator-based boron neutron capture therapy (BNCT), in concert with Linac Systems' CW RFI linac. Lithium metal targets present well-known physical and mechanical challenges at high beam power density that are addressed in our design. For instance, lithium melts at 180 C, necessitating efficient removal of heat at a low ΔT relative to ambient temperature. CFD modeling indicates that with 50 kW incident beam power, the peak lithium temperature can be held below 150 C with a water flow rate near 80 l min-1 and corresponding pressure drop of 170 kPa. The target prototype has been fabricated and is undergoing experimental thermal-hydraulic testing using an electron beam at the Plasma Materials Test Facility, Sandia National Laboratory.

MOP064 Bent Solenoid Tuning Simulations for the COMET Beamline solenoid, simulation, dipole, electron 226
  • A. Kurup
    Imperial College of Science and Technology, Department of Physics, London

The COMET experiment beamline uses bent solenoids for the muon transport and the spectrometer used to analyse the decay electrons from stopped muons. The bent solenoid includes not just a solenoid field but also a vertical dipole field. It is therefore important to have the ability to tune the field distribution. However, since the field distribution is mainly determined by the geometry it is difficult to adjust once the solenoids have been constructed. A cost effective method to provide tuning capability of the field distribution of the bent solenoids is proposed and the results of simulations presented.

MOP069 Beam Dynamics Simulations for a 15 MeV Superconducting Electron Linac Coupled to a DC Photo-Injector cathode, simulation, focusing, solenoid 236
  • D. Guilhem, J.-L. Lemaire, S.J. Pichon
    CEA, Bruyeres-le-Chatel

A 15 MeV accelerator scheme based on a dc photo-injector and a rf superconducting linac as been proposed as a new facility for radiography applications. The overall beam dynamics simulation process based on SUPERFISH and PARMELA codes will be reviewed. We present the results for the following beam operating conditions; acceleration of limited number of bunches, up to twenty electron micro-pulses of 100 ps time duration and 200 nC bunch charge, at 352 MHz repetition rate.

MOP070 Beam Dynamics and Error Studies of the SPIRAL2 Driver Accelerator linac, ion, quadrupole, cavity 239
  • P. Bertrand
    GANIL, Caen
  • J.-L. Biarrotte, L. Perrot
    IPN, Orsay
  • D. Uriot
    CEA, Gif-sur-Yvette

After a detailed design study phase (2003-2004), the SPIRAL2 project at GANIL (Caen, France) was officially approved in May 2005, and is now in its phase of construction, with a project group including the participation of many French laboratories (CEA, CNRS) and international partners. The SPIRAL2 facility is composed of a multi-beam driver accelerator (5 mA/40 Mev deuterons, 5 mA/33 Mev protons, 1 mA/14.5 M ev/u heavy ions), a dedicated building for the production of Radiactive Ion Beams, the existing cyclotron CIME for the post acceleration of the RIBs, and new experimental areas. In this presentation we focus on the beam dynamics studies dedicated to the SPIRAL2 accelerator part of the project, from the ECR sources to the High Energy Beam Lines which have been recently updated. Various tuning examples will be presented for a variety of ions at different final energies, including error studies and beam losses evaluation. Accent is also put on the way we tune the accelerator with the computing code TRACEWIN, by using 3D electromagnetic maps and diagnostics corresponding to the real machine.

MOP077 Beam Dynamics Studies on the EURISOL Driver Accelerator linac, rfq, emittance, proton 257
  • A. Facco, A.I. Balabin, R. Paparella, D. Zenere
    INFN/LNL, Legnaro, Padova
  • D. Berkovits, J. Rodnizki
    Soreq NRC, Yavne
  • J.-L. Biarrotte, S. Bousson, A. Ponton
    IPN, Orsay
  • R.D. Duperrier, D. Uriot
    CEA, Gif-sur-Yvette
  • V. Zvyagintsev
    TRIUMF, Vancouver

Funding: We acknowledge the financial support of the European Community under the FP6 "Research Infrastructure Action-Structuring the European Research Area" EURISOL DS Project Contract No. 515768 RIDS.
A 1 GeV, 5 mA cw superconducting proton/H- linac, with the capability of supplying cw primary beam to up to four targets simultaneously by means of a new beam splitting scheme, is under study in the framework of the EURISOL DS project which aims to produce an engineering-oriented design of a next generation European Radioactive beam facility. The EURISOL driver accelerator would be able to accelerate also a 100 muA 3He beam up to 2 GeV, and a 5 mA deuteron beam up to 200 MeV. The linac characteristics and the status of the beam dynamics studies will be presented.

MOP085 Calculations of Targets for ADS Using GEANT-4 neutron, proton, injection, hadron 272
  • Y.A. Svistunov
    NIIEFA, St. Petersburg
  • R.S. Kolevatov
    Saint-Petersburg State University, Saint-Petersburg
  • I.V. Kudinovich
    AN Krylov SRI, St. Petersburg

Funding: Rosatom corp.
We present results of calculations of the neutron generation processes in metal targets induced by protons with energies up to 1 GeV using GEANT4 framework. Results on the neutron yield in large targets and neutron generation as a function of target's dimensions are presented. Energy deposit in the target is also given. The obtained results are to be used for multiplying blanket ADS target design.

MOP098 The Open Architecture Software Integration System (OASIS) for Creating PBO Lab Modules optics, electron 302
  • G.H. Gillespie, W. Hill
    G.H. Gillespie Associates, Inc., Del Mar, California

A specialized software package has been developed that enables the rapid implementation of custom beam optics modules that run in the Particle Beam Optics Laboratory (PBO Lab). PBO Lab is a commercially available software application that supports a suite of accelerator codes for design, operations, and personnel education. The intuitive and easy-to-use graphic user interface (GUI) is largely responsible for the popularity of PBO Lab. The Open Architecture Software Integration System, or OASIS, builds upon the capability of PBO Lab to host a suite of different codes, and provides an innovative framework that allows users to readily integrate their own optics programs into PBO Lab. The OASIS GUI can be used to readily create new PBO Lab modules without writing or compiling any source code. OASIS has been used to develop several new modules for PBO Lab. This paper presents a summary of the OASIS framework and describes some of the features used in creating the new PBO Lab modules for several popular optics codes.

MOP110 Precise Control of Cooling Water System for Stabilization of 125 MeV Linac at LEBRA linac, electron, klystron, FEL 331
  • T. Sakai, M. Inagaki, T. Kuwada, I. Sato
    Nihon University, Advanced Research Institute for the Sciences and Humanities, Funabashi
  • K. Hayakawa, Y. Hayakawa, K. Nakao, K. Nogami, Y. Takahashi, T. Tanaka
    LEBRA, Funabashi

The 125 MeV linac at Laboratory for Electron Beam Research and Application (LEBRA) in Nihon University has been used for generation of the near-infrared FEL and the Parametric X-ray Radiation (PXR). Currently the FELs from 0.86 to 6 microns and the PXR X-rays from 5 to 20 keV are available at LEBRA. Precise experiments using the light sources require a high stability in both the wavelength and the intensity of the lights. Though the linac was operated with the cooling water stabilized at 30 plus or minus 0.2 deg C, periodical fluctuation of the electron beam energy and the beam orbit suggested that the stability of the cooling water temperature was not sufficient. With this condition a large fluctuation (plus or minus 15%) was observed for the PXR intensity. After the improvement of the fine cooling water system and the water flow path, fluctuation of the cooling water temperature at the supply head of the accelerating tubes and the electromagnets was suppressed to within plus or minus 0.01 deg C. As a result of the improvement the PXR intensity fluctuation at the X-ray output port has been suppressed to within plus or minus 2% for the operation over several hours.

TU104 Laser Acceleration of Quasi-Monoenergetic MeV-GeV Ion Beams laser, acceleration, ion, emittance 358
  • J.C. Fernandez
    LANL, Los Alamos, New Mexico

Laser interactions with thin solid targets can produce sheath fields of tens of TV/m, which have been used to accelerate ions to several MeV with ps pulse lengths, high currents, and low transverse emittance. While previous results have had 100% energy spread, recent experiments using foils coated with a few monolayers have produced quasi-monoenergetic beams with 17% energy spread near 3 MeV. Such beams may be of interest as injectors or sources. Simulations show the potential for acceleration to hundreds of MeV or GeV energies using very thin foils.


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TUP002 ARIEL and the TRIUMF E-Linac Initiative, a 0.5 MW Electron Linac for Rare Isotope Beam Production linac, cavity, TRIUMF, electron 383
  • S.R. Koscielniak, F. Ames, R.A. Baartman, I.V. Bylinskii, R.J. Dawson, J.T. Drozdoff, K. Fong, A. Hurst, R. Keitel, R.E. Laxdal, F. Mammarella, M. Marchetto, L. Merminga, A.K. Mitra, K.W. Reiniger, T.C. Ries, R. Ruegg, I. Sekachev, G.M. Stinson, V.A. Verzilov
    TRIUMF, Vancouver
  • D. Karlen
    Victoria University, Victoria, B.C.

TRIUMF, in collaboration with university partners, proposes to construct a megawatt-class electron linear accelerator (e-linac) as a driver for U(γ,f) of actinide targets for nuclear astrophysics studies, and 9Be(γ,p)8Li for beta-NMR materials science. The e-linac is part of a broader proposal for an expansion of the TRIUMF rare isotope beams capability through a new facility to be named ARIEL. The e-linac design and prospects for funding are elaborated.

TUP008 Recent Changes to the e- / e+ Injector (Linac II) at DESY linac, positron, gun, electron 401
  • M. Hüning, M. Schmitz
    DESY, Hamburg

The Linac II at DESY consists of a 6A/150kV DC electron gun, a 400 MeV primary electron linac, a 800 MW positron converter, and a 450 MeV secondary electron/positron linac. The Particle Intensity Accumulator (PIA) is also considered part of the injector complex accumulating and damping the 50 Hz beam pulses from the linac and transferring them with a rate of 6.25 Hz or 3.125 Hz into the Synchrotron DESY II. The typical positrons rates are 6·1010/s. DESY II and Linac II will serve as injectors for the two synchrotron light facilities PETRA III and DORIS. Since PETRA III will operate in top-up mode, Linac availability of 98-99% are required. DORIS requires positrons for operation. Therefore during top-up mode positrons are required for both rings. In order to maintain its reliability over the operation time of the new facility PETRA III, the major components of the linac were renovated. Some components were redesigned taking into account experience from 30 years of operation.

TUP010 Pulse-to-Pulse Mode Switching of KEKB Injector Linac injection, positron, electron, linac 407
  • T. Kamitani, K. Furukawa, N. Iida, M. Ikeda, K. Kakihara, M. Kikuchi, T. Mimashi, S. Ohsawa, M. Satoh, A. Shirakawa, T. Sugimura, T. Suwada, K. Yokoyama
    KEK, Ibaraki

KEKB injector linac supplies electron and positron beams to the KEKB storage rings and the synchrotron radiation facility rings (PF, AR) as well. Injection modes to these four destinations are switched by inserting and extracting positron generation target, changing magnet parameters and acceleration rf phases. To enable pulse-by-pulse switching in three out of the four modes, a pulse bend and pulse steerings are introduced. For DC quads and DC steerings, compatible beam-optical settings for beams of different beam-energy profiles are introduced. We have been performing beam studies to establish the pulse-by-pulse mode switching for daily beam operation. This paper describes a scheme for the mode switching and reports on an achievement of the beam studies.

TUP013 Present Status of the KEK Injector Upgrade for the Fast Beam-Mode Switch linac, electron, injection, positron 416
  • M. Satoh
    KEK, Ibaraki

The KEK electron/ positron linac is a 600 m long linear accelerator with the maximum energy 8 GeV electron and 3.5 GeV positron, and it is used as an injector for 4-rings (KEKB e-/ e+, PF, PF-AR). To increase the operation efficiency, we have an injector upgrade plan for a simultaneous injection operation. In this paper, we will present the operation scheme and the progress of upgrade project.


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TUP018 A 150 MeV Pulse Electron Linac with a 1 mA Average Current electron, linac, simulation, emittance 428
  • V.A. Kushnir, M.I. Ayzatskiy, V.N. Boriskin, A.N. Dovbnya, I.V. Khodak, S.G. Kononenko, V.V. Mytrochenko, S.A. Perezhogin, Y.D. Tur
    NSC/KIPT, Kharkov

Funding: The present work is supported by the STCU project #P233
The accelerator driven subcritical assembly facility is under development in the National Science Center Kharkov Institute of Physics and Technology. The important component of the facility is an electron linac with energy of particles of 100-200 MeV and average beam current of 1 mA. In this paper we focus on the S-band electron linac design. The accelerator scheme includes the injector based on evanescence waves, rf chopper, five accelerating structures and energy compression system. The results of calculation of accelerating structure performances and linac systems are considered in the paper

TUP020 Commissioning the DARHT-II Accelerator Downstream Transport and Target kicker, quadrupole, septum, solenoid 434
  • M.E. Schulze
    SAIC, Los Alamos, New Mexico
  • E.O. Abeyta, R.D. Archuleta, J. Barraza, D. Dalmas, C. Ekdahl, W.L. Gregory, J.F. Harrison, E.B. Jacquez, J.B. Johnson, P.S. Marroquin, B.T. McCuistian, R.R. Mitchell, N. Montoya, S. Nath, K. Nielsen, R.M. Ortiz, L.J. Rowton, R.D. Scarpetti, M. Schauer, G.J. Seitz
    LANL, Los Alamos, New Mexico
  • R. Anaya, G.J. Caporaso, F.W. Chambers, Y.-J. Chen, S. Falabella, G. Guethlein, B.A. Raymond, R.A. Richardson, J.A. Watson, J.T. Weir
    LLNL, Livermore, California
  • H. Bender, W. Broste, C. Carlson, D. Frayer, D. Johnson, C.-Y. Tom
    NSTec, Los Alamos, New Mexico
  • T.P. Hughes, C.H. Thoma
    Voss Scientific, Albuquerque, New Mexico

The DARHT-II accelerator produced a 2 kA, 17 MeV beam over a 1600 ns flattop. After exiting the accelerator, the long pulse is sliced into four short pulses by a kicker and quadrupole septum and then transported and focused on a target for conversion to bremsstrahlung for radiography. We describe the initial commissioning tests of the kicker, septum, transport, and multi-pulse converter target. The results of beam measurements made during the commissioning of the accelerator downstream transport are described. Beam optics simulations of the commissioning results are described.


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TUP063 Development of a New Highly Bright X-ray Generator electron, brightness, radiation, synchrotron 539
  • S. Ohsawa, M. Ikeda, N. Sakabe, T. Sugimura
    KEK, Ibaraki

A new type of rotating anticathode X-ray generator has been developed, in which the electron beam irradiates the inner surface of a U-shaped anticathode. A high-flux electron beam is focused on the inner surface by optimizing the shape of the bending magnet. In order to minimize the sizes of the X-ray source, the electron beam is focused strongly in a short distance by the bending magnet which is small and is close to the rotating anticathode. The power of the electron beam can be increased to the point at which the irradiated part of the inner surface is melted, because a strong centrifugal force fixes the melted part on the inner surface. We have achieved emission of X-rays 10 times more brilliant than can be attained by a conventional rotating anticathode. The development is still in progress. New results will be reported in detail.

TUP064 Nuclear Reaction Analysis by Using Quasi-Elastic Scattering of Ultra Low Intensity Electron Beams electron, neutron, radiation, scattering 542
  • R. Taniguchi, T. Kojima, S. Okuda, R. Sasaki
    Osaka Prefecture University, Sakai

Energetic electron beams higher than several MeV occasionally induce direct nuclear reactions with the target nuclei. These processes are attributed to the quasi-elastic scattering of electrons (e,e') with the target nuclei and similar to the photo-nuclear reactions. These reactions are considered to be useful for the non-destructive analysis of heavy elements such as U and Th. In addition, a two-dimensional analysis is realized only by scanning of electron beam. On the other hand, the huge X-ray burst caused by the bremsstrahlung with the electron pulse bombardment is the most harmful phenomenon for the radiation measurement system. In this study, an ultra low intensity electron beam was used for relieving the problem, which has been developed by modifying an electron linear accelerator. The minimum beam charge about several aC/pulse has been achieved at the present. Consequently, the neutron emitted by Pb(e,e'n)Pb reaction was measured successfully by the use of the low intensity beams. The linearity between the neutron count and the concentration of Pb in the target was verified experimentally.

TUP068 Project of a Neutron Source Based on the Sub-Critical Assembly Driven by Electron Linear Accelerator neutron, electron, octupole, shielding 551
  • I.M. Karnaukhov, V. Azhazha, A.N. Dovbnya, A.S. Kostromin, V.E. Krasnorutzkiy, I.M. Neklyudov, S.A. Perezhogin, S. Soldatov, A.Y. Zelinsky
    NSC/KIPT, Kharkov
  • I. Bolshinsky
    Idaho National Laboratory, Idaho
  • M.Y.A. Gohar
    ANL, Argonne

Today accelerator driven subcritical assembly is candidate for the next generation of energy-generating nuclear facility, which could provide safe energy production, burning of transuranium elements and transmutation of radionuclides. Use of the electron beam with particle energy up to 150-200 MeV secures several advantages. Electron linear accelerators are much cheaper compared to hadron accelerators. Homogeneous irradiation of the assembly with neutrons could be provided. NSC KIPT together with ANL develops the project of a neutron source based on the sub-critical assembly driven by electron linear accelerator. Energy of electrons is 100-200 MeV. The target and assembly design is optimized to maximize the neutron source intensity with subcriticality of 0.98. Accelerator on average beam power of 100 kW, with repetition rate up to 300 Hz and pulse duration of 3,2 ms is under development. Transportation line should provide beam transfer with minimal losses of electrons and should form homogeneous distribution of the particle density at the target. Maximal value of a neutron flux is Fm=2x1013 n/(cm2s), and power of energy release in the result of nuclei fission is Pm≈ 100 kW.

TUP072 AIRIX Diagnostic Devices for Focal Spot Size and Dose Measurements diagnostics, electron 560
  • O. Pierret
    CEA, Pontfaverger-Moronvilliers

Funding: CEA-DAM, Polygone d'Experimentation de Moronvilliers 51 490 Pontfaverger Moronvilliers (France). olivier.pierret@cea.fr
AIRIX is a 2 kA, 19 MeV, 60 ns, single shot linear accelerator that produces X-rays from the interaction between relativistic electrons and a Tantalum solid target (Ta). Focal spot size, integrated and temporal dose are the main characteristics that we need for the successful development of flash radiography at hydro test facilities. MTFX is a 12 bit Charge-Coupled Device (CCD) intensified camera which is equipped with a scintillator. It can give focal spot size measurements in two directions using a two dimensional wedge. By another way Mucaddix is a CVD Diamond detector which is integrated nearby the AIRIX X-ray beam source. It gives integrated dose, time resolve dose, temporal characteristics of the X-ray flash and timing of the flash respect to the start of object implosion. These two measurement systems are described and the quantified results are reviewed here.

TUP077 Development of Screen Monitor with a Spatial Resolution of Ten Micro-meters for XFEL/SPring-8 electron, vacuum, focusing, undulator 573
  • K. Yanagida, H. Tomizawa, A. Yamashita
    JASRI/SPring-8, Hyogo-ken
  • S.I. Inoue, Y. Otake
    RIKEN/SPring-8, Hyogo

At SPring-8, the 8 GeV linac for an X-ray free electron laser (XFEL) is now under construction. In order to realize the XFEL, highly qualified electron beams are required. A measurement of spatial structure of such beam is very important for the beam tuning of XFEL. The spatial structure is measured with a screen monitor, which we now develop. The resolution of the measurement is required within 10 um. The screen monitor comprises a vacuum chamber with a thin metal (100 um, SUS) foil to emit OTR, lenses for focusing and a CCD camera system. The main feature of the monitor is a bright and high-resolution optical system. In order to realize this system, the lenses are placed close to the foil, the distance between the lenses and the foil is 100 mm, and the lenses have a large diameter (2 in.). This optical-geometrical structure also contributes much to reduce the airy radius of a near field image. Although the range of an observation wavelength is wide as which is form 400 to 800 nm, the resolution of the measurement on the foil is calculated as 2.5 um. The experimental data of the developed screen monitor also suggested the same resolution.

TH203 Beam Compression in Heavy-Ion Induction Linacs plasma, ion, solenoid, focusing 754
  • P.A. Seidl, A. Anders, F.M. Bieniosek, A.X. Chen, J.E. Coleman, J.-Y. Jung, M. Leitner, S.M. Lidia, B.G. Logan, P.N. Ni, P.K. Roy, K. Van den Bogert, W.L. Waldron
    LBNL, Berkeley, California
  • J.J. Barnard, R.H. Cohen, D.P. Grote
    LLNL, Livermore, California
  • J.A. Calanog
    UCB, Berkeley, California
  • M. Dorf, E.P. Gilson
    PPPL, Princeton, New Jersey
  • D.R. Welch
    Voss Scientific, Albuquerque, New Mexico

Funding: This work was supported by the Office of Fusion Energy Sciences, of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231, DE-AC52-07NA27344, DE-AC02-76CH3073.
The Heavy-Ion Fusion Sciences Virtual National Laboratory is pursuing an approach to target heating experiments in the Warm Dense Matter regime, using space-charge-dominated ion beams that are simultaneously longitudinally bunched and transversely focused. Longitudinal beam compression by large factors has been demonstrated in the LBNL Neutralized Drift Compression Experiment (NDCX) experiment with controlled ramps and forced neutralization. The achieved peak beam current and energy can be used in experiments that generate plasmas of warm dense matter. Using an injected 30 mA K+ ion beam with initial kinetic energy 0.3 MeV, axial compression leading to ~100X current amplification and simultaneous radial focusing to beam radii of a few mm have led to encouraging energy deposition approaching the intensities required for eV-range target heating experiments. We discuss the status of several improvements to the experiment and associated beam diagnostics that are under development to reach the necessary higher beam intensities.


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THP046 Preliminary Design of the Slow Chopper for the SPIRAL 2 Project power-supply, high-voltage, vacuum, pick-up 891
  • M. Di Giacomo
    GANIL, Caen
  • A.C. Caruso, G. Gallo, D. Rifuggiato, A. Spartà, E. Zappalà
    INFN/LNS, Catania
  • A. Longhitano
    ALTEK, San Gregorio (CATANIA)

The SPIRAL2 LEBT line uses a single chopper situated in the line section common to protons, deuterons and A/Q=3 ions. The paper describes the design and the test of the power circuits, based on standard components and working up to 10 kV, at a 1 kHz repetition rate.

FR201 The IFMIF 5 MW Linacs rfq, linac, emittance, simulation 1114
  • A. Mosnier
    CEA, Gif-sur-Yvette

The International Fusion Materials Irradiation Facility (IFMIF) is based on two high power cw accelerator drivers, each delivering a 125 mA deuteron beam at 40 MeV to the common lithium target. The present design of the 5 MW IFMIF Linacs, as well as the description of the prototype accelerator to be built in Japan are presented: the injector including the 140 mA ion source and the magnetic focusing LEBT, the RFQ for the bunching and acceleration to 5 MeV, the MEBT for the proper injection into the Drift-Tube-Linac where the beam is accelerated to the final energy of 40 MeV. Recently, the Alvarez type DTL was replaced by a superconducting Half-Wave Resonator Linac to benefit from the advantages of the SRF technology, in particular the rf power reduction, plug power saving, ability to accelerate high intensity cw beams with high flexibility and reliability. Last, a HEBT section transports and tailors the beam as a flat rectangular profile on the flowing Lithium target. The design and technology choices will be validated during the EVEDA phase, which includes the construction of one full-intensity deuteron linac, but at a lower energy (9 MeV) at Rokkasho Mura in Japan.


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