Keyword: solenoid
Paper Title Other Keywords Page
MOPFI018 Design Study of a New Large Aperture Flux Concentrator positron, target, simulation, focusing 318
 
  • L. Zang, M. Akemoto, S. Fukuda, K. Furukawa, T. Higo, K. Kakihara, T. Kamitani, Y. Ogawa, H. Someya, T. Takatomi
    KEK, Ibaraki, Japan
  
  For high luminosity electron-positron colliders, intense positron beam production is one of the key issues. Flux Concentrator (FC) is a pulsed solenoid that can generate high magnetic field of several Tesla and is often used for focusing positrons emerged from a production target. It works as an optical matching device in a positron capture section. With this device, high capture efficiency is achieved. In this paper, we will introduce a new design of a FC for the SuperKEKB positron source. The advantages of the new design are: 1. the aperture could be doubled of the previous design, 2. the transverse components are only 1/10 of the previous design, 3. maintain the same high peak longitudinal field. The new FC modeling has been done in CST Studio and we will report the results of new FC field evaluation. In order to calculate the positron yield and capture efficiency, a tracking simulation to the end of capture section has also been carried out, which is also included in this paper.  
 
MOPFI037 Design and Experiment of a Compact C-band Photocathode RF Gun for UED gun, emittance, cathode, electron 369
 
  • X.H. Liu, H.B. Chen, W.-H. Huang, C.-X. Tang, Z. Zhang
    TUB, Beijing, People's Republic of China
  
  A compact C-band photocathode RF gun for the MeV UED facility is developed in Tsinghua University, which is designed to work at the frequency of 5.712GHz. This paper presents the physics and RF structure design, and beam dynamics optimization of this C-band RF gun. Some new structure design will be adopted in this gun, including the optimized cavity length and elliptical iris, which is helpful to achieve lower emittance and larger mode separation. This paper likewise presents experiment parameters and the cold test results of this C-band RF gun.  
 
MOPFI062 Optimization Studies for the SwissFEL RF-Gun gun, cathode, laser, emittance 425
 
  • M. Schaer, A. Adelmann, A. Anghel, S. Bettoni, P. Craievich, L. Stingelin, C. Vicario, R. Zennaro
    PSI, Villigen PSI, Switzerland
  • Z. Zhang
    TUB, Beijing, People's Republic of China
  
  The 250 MeV SwissFEL injector test facility is in operation since August 2010. Measurements with the "CTF2 Gun 5" photocathode S-band rf-gun show promising beam parameters and satisfy the requirements of the SwissFEL project. Since the performance of the electron source is fundamental for the stability and brightness of a free electron laser, further gun optimization studies are pursued. Under investigation is currently a 3.6 cell C-band gun. First ASTRA simulations indicate that with this gun the peak-current can be increased, thanks to a shorter laser pulse and a higher initial acceleration, by almost a factor of two, at slightly better emittance values than the S-band "PSI Gun 1". Since the beam-quality depends also on the achieved performance of the cathode, several copper cathodes had been tested in the SwissFEL injector test facility to analyze the observed rapid degradation of quantum efficiency.  
 
MOPFI078 The Possibility of Generation of High Energy Electron Beam at the SNS Facility electron, acceleration, laser, linac 458
 
  • T.V. Gorlov, A.V. Aleksandrov, V.V. Danilov
    ORNL, Oak Ridge, Tennessee, USA
  
  Funding: ORNL/SNS is managed by UT-Battelle, LLC, for the U.S. Department of Energy under contract DE-AC05-00OR22725
The linac of the SNS accelerator facility can be used to produce an electron beam with 300-400 MeV energy. At present there are a few predesigned experiments with electron beam that can be alternatively carried out at the SNS. However, the SNS linac is designed and optimized for acceleration of H− , which brings some problems when considering direct acceleration of electrons. Alternative machine setup for electron acceleration and transport are discussed. Here, we present a study of the optimal electron beam parameters that can be achieved without any significant changes of the SNS accelerator. 		 
 
MOPWO013 A New Scalable Software Package for Large Scale Beam Dynamic Simulations simulation, space-charge, target, DTL 912
 
  • R. Zhao, J. Xu
    IS, Beijing, People's Republic of China
  • Y. He, C. Li, X. Qi, L. Yang
    IMP, Lanzhou, People's Republic of China
  
  Large scale Beam Dynamics Simulations (BDS) are important in accelerator design and optimization. With the fast development of supercomputers, new software packages need to be developed in order to fully make use of hardware and software progresses. In this paper, we will introduce a new BDS software package, LOCUS3D, which is developed for efficient use of these new techniques. It is based on Particle-In-Cell (PIC) method, and includes space charge effect by solving the Poisson’s equation. Parallel Poisson solver has been developed with MPI. Standard accelerator devices can be simulated and new devices can be added. Benchmark results have been obtained on several different platforms, such as INSPUR cluster at RDCPS, BG/P at ANL. Large-scale simulation with 109 particles can be simulated now in the simulations. LOCUS3D will be used for more realistic accelerator simulations in the near future.  
 
MOPWO062 A Parallel Multi-objective Differential Evolution Algorithm for Photoinjector Beam Dynamics Optimization controls, emittance, electron, gun 1031
 
  • J. Qiang, C.E. Mitchell, S. Paret, R.D. Ryne
    LBNL, Berkeley, California, USA
  • Y.X. Chao
    UCB, Berkeley, California, USA
  
  Funding: Work supported by the Director of the Office of Science of the US Department of Energy under Contract no. DEAC02-05CH11231
In photoinjector design, there is growing interest in using multi-objective beam dynamics optimization to minimize the final transverse emittances and to maximize the final peak current of the beam. Most previous studies in this area were based on genetic algorithms. Recent progress in optimization suggests that the differential evolution algorithm could perform better in comparison to the genetic algorithm. In this paper, we propose a new parallel multi-objective optimizer based on the differential evolution algorithm for photoinjector beam dynamics optimization. We will discuss the numerical algorithm and some benchmark examples. This algorithm has the potential to significantly reduce the computation time required to reach the optimal Pareto solution. 		 
 
MOPWO066 GPU-accelerated Spin Dynamics and Analysis for RHIC polarization, quadrupole, simulation, proton 1037
 
  • D.T. Abell, D. Meiser
    Tech-X, Boulder, Colorado, USA
  • M. Bai, V.H. Ranjbar
    BNL, Upton, Long Island, New York, USA
  • D.P. Barber
    DESY, Hamburg, Germany
  
  Funding: This work supported in part by the US DOE Office No. DE-SC0004432.
Graphics processing units (GPUs) have now become powerful tools for scientific computation. Here we present our work on using GPUs (singly or in parallel) to speed the tracking of both orbital and spin degrees of freedom in particle accelerators. This work includes the development of new spin integrators that are both fast and accurate. We have also developed an integrated set of tools for analysing the results. To demonstrate the utility of these new tools, we use them to study the spin dynamics of protons in the Relativistic Heavy Ion Collider at Brookhaven National Lab. 		 
 
TUOAB102 Project X Injector Experiment: Goals, Plan and Status kicker, rfq, ion, cryomodule 1093
 
  • A.V. Shemyakin, S.D. Holmes, D.E. Johnson, M. Kaducak, R.D. Kephart, V.A. Lebedev, C.S. Mishra, S. Nagaitsev, N. Solyak, R.P. Stanek, V.P. Yakovlev
    Fermilab, Batavia, USA
  • D. Li
    LBNL, Berkeley, California, USA
  • P.N. Ostroumov
    ANL, Argonne, USA
  
  Funding: This work was supported by the U.S. DOE under Contract No.DE-AC02-07CH11359
A multi-MW proton facility, Project X, has been proposed and is currently under development at Fermilab. We are carrying out a program of research and development aimed at integrated systems testing of critical components comprising the front end of the Project X. This program is being undertaken as a key component of the larger Project X R&D program. The successful completion of this program will validate the concept for the Project X front end, thereby minimizing a primary technical risk element within Project X. Integrated systems testing, known as the Project X Injector Experiment (PXIE), will be accomplished with a new test facility under construction at Fermilab and will be completed over the period FY12- 17. PXIE will include an H− ion source, a CW 2.1-MeV RFQ and two superconductive RF (SRF) cryomodules providing up to 25 MeV energy gain at an average beam current of 1 mA (upgradable to 2 mA). Successful systems testing will also demonstrate the viability of novel front end technologies that are expected find applications beyond Project X. 		 
slides icon Slides TUOAB102 [1.615 MB]  
 
TUPEA087 Experiment on Multipactor Suppression in Dielectric-loaded Accelerating Structures with a Solenoid Field multipactoring, electron, simulation, plasma 1319
 
  • C.-J. Jing, S.P. Antipov, A. Kanareykin, P. Schoessow
    Euclid TechLabs, LLC, Solon, Ohio, USA
  • C. Chang, L. Ge, L. Xiao
    SLAC, Menlo Park, California, USA
  • M.E. Conde, W. Gai, R. Konecny, J.G. Power
    ANL, Argonne, USA
  • S.H. Gold
    NRL, Washington, DC, USA
  
  Funding: US DoE SBIR Phase I project under contract #DE-SC0007629
Efforts by numerous institutions have been ongoing over the past decade to develop a Dielectric-Loaded Accelerating (DLA) structure capable of supporting high gradient acceleration when driven by an external rf source. Multipactor is the major issue limiting the gradient that was revealed in earlier experiments. A theoretical model predicts that the strength of solenoid field within an optimal range applied to DLA structures may completely block the multipactor. To demonstrate this approach, two DLA test structures have been built and the first high power test will be conducted in December 2012. The results will be reported. 		 
 
TUPFI018 A Simplified Magnetic Field Tapering and Target Optimisation for the Neutrino Factory Capture System target, proton, interaction-region, factory 1370
 
  • I. Efthymiopoulos, S.S. Gilardoni, O.M. Hansen, G. Prior
    CERN, Geneva, Switzerland
  • O.M. Hansen
    University of Oslo, Oslo, Norway
  • G. Prior
    University of Canterbury, Christchurch, New Zealand
  
  In the Neutrino Factory, a 4 MW proton beam with a kinetic energy between 5 and 15 GeV interacts with a liquid mercury jet target in order to produce pions that will decay to muons, which in turn decay to neutrinos. The baseline-capturing layout consists of a series of solenoids producing a tapered magnetic field from 20 T, near the target, down to 1.5 T at the entrance of the drift section where the captured pions decay into muons to produce a useful beam for the machine. In our alternative layout the magnetic field is rapidly squeezed from 20 T to 1.5T using only three solenoids. This layout showed to produce similar performance, having the advantage being simpler and could potentially be made more robust to radiation. Here we report on further optimization studies taking into account the complete path and shape fluctuations of the Hg-jet.  
 
TUPFI020 Towards a Symmetric Momentum Distribution in the Muon Ionization Cooling Experiment simulation, quadrupole, collider, emittance 1376
 
  • O.M. Hansen
    University of Oslo, Oslo, Norway
  • A.P. Blondel
    DPNC, Genève, Switzerland
  • I. Efthymiopoulos, O.M. Hansen
    CERN, Geneva, Switzerland
  
  The Muon Ionization Cooling Experiment (MICE) is under development at Rutherford Appleton Laboratory (UK). It's a proof-of-principle experiment for ionization cooling, which is a prerequisite for a future Neutrino Factory(NF) or a Muon Collider. The muon beam is designed to have a symmetrical momentum distribution in the cooling channel of the NF. In the MICE beamline pions are captured by a quadrupole triplet, then pion momentum is selected by dipole 1 (D1) after which the pions decay to muons in the decay solenoid. After the decay solenoid, the muon beam momentum is selected by dipole 2 (D2), the beam is focused in two quadrupole triplets and is finally characterized by a set of detectors. By doing a D1-scan of the currents, where the optics parameters are scaled according to the pion momentum, from 238-450 MeV/c the muon momentum distribution is changed. In this paper simulation results from G4Beamline and real data from MICE are presented and compared.  
 
TUPFI046 The MICE Experiment target, emittance, simulation, quadrupole 1454
 
  • A.P. Blondel
    DPNC, Genève, Switzerland
  
  Ionization Cooling is the only practical solution to preparing high brilliance muon beams for a neutrino factory or muon collider. MICE is under development at the Rutherford Appleton Laboratory (UK). It is characterized by exquisite emittance determination by 6D measurement of individual particles, a cooling section comprising 23 MV of acceleration at 200 MHz and 3 liquid hydrogen absorbers totaling 1m of liquid hydrogen on the path of 140-240 MeV/c muons. The beam has already been commissioned successfully and first measurements of beam emittance performed. We are setting up for the final high precision emittance determination and the measurements of cooling in Li Hydrogen. The design offers opportunities to observe cooling with various absorbers and several optics configurations. Results will be compared with detailed simulations of cooling channel performance to ensure full understanding of the cooling process. Progress towards the full cooling experiment with RF re-acceleration will also be reported.
Submitted by the MICE speakers bureau
hoping for a contributed oral
to be give by the spokesperson, prof. A. Blondel 		 
 
TUPFI054 MICE Spectrometer Solenoid Magnetic Field Measurements emittance, simulation, shielding, factory 1466
 
  • M.A. Leonova
    Fermilab, Batavia, USA
  
  The Muon Ionisation Cooling Experiment (MICE) is designed to demonstrate ionization cooling in a muon beam. Its goal is to measure a 10% change in transverse emittance of a muon beam going through a prototype Neutrino Factory cooling channel section with a 1% accuracy, corresponding to an absolute measurement accuracy of 0.1%. To measure the emittance, MICE uses two solenoidal spectrometers. The Spectrometer Solenoids are designed to have 4 T solenoidal fields, uniform at 3 per mil level in the tracking volumes. Analysis of magnetic field measurements of the Spectrometer Solenoids will be discussed, and results of extracting precise coil positions, angles, and coil radius measurements for input into magnet models will be presented.  
 
TUPFI066 Muon Ionization Cooling Experiment Step VI simulation, emittance, site, target 1502
 
  • D. Rajaram
    Illinois Institute of Technology, Chicago, Illinois, USA
  • P. Snopok
    IIT, Chicago, Illinois, USA
  
  In the Muon Ionization Cooling Experiment (MICE) the transverse emittance of the muon beam is reduced (muon cooling) by passing it through low-Z material, then through RF cavities to compensate for the energy loss. Transverse emittance reduction of the muon beam will be demonstrated for the first time in MICE Step IV configuration using liquid Hydrogen absorbers as well as a variety of solid absorbers. Current status and efforts towards Step IV are summarized, including hardware fabrication and testing, Monte Carlo simulations, track reconstruction algorithms.  
 
TUPFI067 Energy Deposition and Shielding Study of the Front End for the Neutrino Factory shielding, proton, target, factory 1505
 
  • P. Snopok
    IIT, Chicago, Illinois, USA
  • D.V. Neuffer
    Fermilab, Batavia, USA
  • C.T. Rogers
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  
  In the Neutrino Factory and Muon Collider muons are produced by firing high energy protons onto a target to produce pions. The pions decay to muons which are then accelerated. This method of pion production results in significant background from protons and electrons, which may result in heat deposition on superconducting materials and activation of the machine preventing manual handling. In this paper we discuss the design of a secondary particle handling system. The system comprises a solenoidal chicane that filters high momentum particles, followed by a proton absorber that reduces the energy of all particles, resulting in the rejection of low energy protons that pass through the solenoid chicane. We detail the design and optimization of the system, its integration with the rest of the muon front end, and energy deposition and shielding analysis in MARS15.  
 
TUPFI073 Design of Magnets for the Target and Decay Region of a Muon Collider/Neutrino Factory Target target, factory, collider, proton 1514
 
  • R.J. Weggel, N. Souchlas
    Particle Beam Lasers, Inc., Northridge, California, USA
  • X.P. Ding
    UCLA, Los Angeles, California, USA
  • V.B. Graves
    ORNL, Oak Ridge, Tennessee, USA
  • H.G. Kirk, H. K. Sayed
    BNL, Upton, Long Island, New York, USA
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
  
  The target and decay region of a Muon Collider/Neutrino Factory transports pions and muons in a superconducting solenoid channel that must be protected from radiation damage secondary particles produced by the 4-MW proton beam. For this, He-gas-cooled tungsten beads will be arrayed inside the magnet coils, which leads to large coil radii and high stored magnetic energy (~3 GJ). The design of the superconducting coils, and the tungsten shielding for the ~ 50-m-long target and decay region is reviewed.  
 
TUPFI075 Optimizing Muon Capture and Transport for a Neutrino Factory/Muon Collider Front End target, proton, factory, collider 1520
 
  • H. K. Sayed, J.S. Berg, H.G. Kirk
    BNL, Upton, Long Island, New York, USA
  • X.P. Ding
    UCLA, Los Angeles, California, USA
  • K.T. McDonald
    PU, Princeton, New Jersey, USA
  
  In the baseline scheme of the Neutrino Factory/Muon Collider a muon beam from pion decay is produced by bombarding a liquid-mercury-jet target with a 4-MW pulsed proton beam. The target is embedded in a high-field solenoid magnet that is followed by a lower field Decay Channel. The adiabatic variation in solenoid field strength along the beam near the target performs an emittance exchange that affects the performance of the downstream Buncher, Phase Rotator, and Cooling Channel. An optimization was performed using MARS1510 and ICOOL codes in which the initial and final solenoid fields strengths, as well as the rate of change of the field along the beam, were varied to maximize the number of muons delivered to the Cooling Channel that fall within the acceptance cuts of the subsequent muon-acceleration systems.  
 
TUPFI077 Commissioning Progress of the RHIC Electron Lenses electron, proton, lattice, controls 1526
 
  • W. Fischer, Z. Altinbas, M. Anerella, M. Blaskiewicz, D. Bruno, W.C. Dawson, D.M. Gassner, X. Gu, R.C. Gupta, K. Hamdi, J. Hock, L.T. Hoff, R.L. Hulsart, A.K. Jain, P.N. Joshi, R.F. Lambiase, Y. Luo, M. Mapes, A. Marone, R.J. Michnoff, T.A. Miller, M.G. Minty, C. Montag, J.F. Muratore, S. Nemesure, D. Phillips, A.I. Pikin, S.R. Plate, P.J. Rosas, L. Snydstrup, Y. Tan, C. Theisen, P. Thieberger, J.E. Tuozzolo, P. Wanderer, S.M. White, W. Zhang
    BNL, Upton, Long Island, New York, USA
  
  Funding: Work supported by U.S. DOE under contract No DE-AC02-98CH10886 with the U.S. Department of Energy.
In polarized proton operation, the RHIC performance is limited by the head-on beam-beam effect. To overcome these limitations two electron lenses were installed and are under commissioning. One lens uses a newly manufactured superconducting solenoid, in the other lens the spare superconducting solenoid of the BNL Electron Beam Ion Source is installed to allow for propagation of the electron beam. (This spare magnet will be replaced by the same type of superconducting magnet that is also used in the other lens during the 2013 shut-down.) We give an overview of the commissioning configuration of both lenses, and report on first results in commissioning the hardware and electron beam. We also report on lattice modifications needed to adjust the phase advance between the beam-beam interactions and the electron lenses, as well as upgrades to the proton instrumentation for the commissioning. 		 
 
TUPFI087 Alternative Muon Cooling Options based on Particle-Matter-Interaction for a Neutrino Factory lattice, cavity, focusing, proton 1550
 
  • D. Stratakis
    BNL, Upton, Long Island, New York, USA
  • A. Alekou
    CERN, Geneva, Switzerland
  • D.V. Neuffer, P. Snopok
    Fermilab, Batavia, USA
  • J. Pasternak
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  • J. Pasternak
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • C.T. Rogers
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
  • P. Snopok
    Illinois Institute of Technology, Chicago, Illinois, USA
  
  Funding: This work is funded by US Dept. of Energy grant numbers DE AC02-98CH10886
An ionization cooling channel is a tightly spaced lattice containing absorbers for reducing the momentum of the muon beam, rf cavities for restoring the momentum and strong solenoids for focusing the beam. Such a lattice is an essential feature of most designs for Neutrino Factories and Muon Colliders. Here, we explore three different approaches for designing ionization cooling channels with periodic solenoidal focusing. Key parameters such as the engineering constraints that are arising from the length and separation between the solenoidal coils are systematically examined. In addition, we propose novel approaches for reducing the peak magnetic field inside the rf cavities by using either a magnetic shield system or a bucked coils configuration. Our lattice designs are numerically examined against two independent codes: The ICOOL and G4BL code. The feasibility of our proposed cooling channels to muon accelerators is examined by applying the proposed lattices to the front-end of a Neutrino Factory. 		 
 
TUPWA018 Local Compensation-Rematch for Element Failures in the Low Energy Section of C-Ads Accelerator cavity, emittance, linac, focusing 1760
 
  • B. Sun, Z. Li, J.Y. Tang, F. Yan
    IHEP, Beijing, People's Republic of China
  
  Due to the requirement of high reliability and availability for the C-ADS accelerators, a fault tolerance design is pursued. The effects of transverse focusing element failures in different locations have been studied and the schemes of compensation by means of local compensation have been investigated. After one transverse element failure especially in the low energy section happens, some new methods have been purposed by which the new settings of the neighbouring solenoids and the cavities can be set, and the Twiss parameters and energy can be approximately recovered to that of the nominal ones at the matching point. We find that the normalized RMS emittance in transverse and longitudinal planes have no obvious growth after applying the compensation in each section of the main linac. When we make study on the compensation-rematch for the RF cavity failures, the TraceWin code has been used that doesn’t consider the phase change during the cavity resetting, so a code named LOCCOM, which is based on MATLAB, is developed and used to compensate the error on arrival-time at the matching point.  
 
TUPWA054 PXIE End-to-end Simulations rfq, simulation, cryomodule, emittance 1829
 
  • J.-F. Ostiguy, J.-P. Carneiro, V.A. Lebedev, A. Saini, N. Solyak
    Fermilab, Batavia, USA
  
  Funding: US DOE contract DE-AC02-76CH03000.
Construction of PXIE, (Project-X Injector Experiment) has recently begun. The goal is to validate the design of the injector and low energy acceleration front-end for a future Project-X. PXIE operates in CW mode and consists in an ion source, a magnetically focused LEBT, a 162.5 MHz RFQ, a MEBT equipped with high bandwidth traveling wave kickers, a cryomodule equipped with 162.5 MHz half-wave resonators and a single cryomodule based on 325 MHz spoke resonators. The arrangement is meant to be closely representative of a future Project-X front end, and will include a variety of diagnostics. In this contribution we present detailed end-to-end tracking simulations. In particular, we examine possible impact of the RFQ longitudinal distribution, neutralization effects in the LEBT as well as of various imperfections in the MEBT on losses in the first superconducting cavities. 		 
 
TUPWA065 Design Issues of Low Energy Beam Transport focusing, space-charge, emittance, ion 1853
 
  • Y.K. Batygin
    LANL, Los Alamos, New Mexico, USA
  
  Low energy beam transport (LEBT) is an important element of ion accelerator facilities to provide beam matching between ion source and accelerator structure, perform required beam diagnostics measurements, dispose extra particle components, and create necessary time structure of the beam. Most of existing ion LEBT are based on solenoid focusing. Design criteria for ion LEBT with magnetostatic focusing are discussed. Dynamics in LEBT is optimized in terms of maximizing acceptance of the channel and transported beam current, and minimizing spherical aberrations in solenoids and space charge induced beam emittance growth.  
 
TUPWO009 Decoupling Capabilities Study of the Emittance Transfer Section emittance, quadrupole, coupling, stripper 1895
 
  • C. Xiao, O.K. Kester
    IAP, Frankfurt am Main, Germany
  • L. Groening, O.K. Kester, M.T. Maier
    GSI, Darmstadt, Germany
  
  Flat beams are those which feature unequal emittances in the horizontal and vertical phase space. The present paper is on the planning of the experimental proof of principle. Detailed simulations of the experiment, initially based on linear matrix transformations, are performed. The remarkable flexibility of the set-up w.r.t. to decoupling is addressed, as it can provide an one-knob tool to set the horizontal and vertical emittance partitioning. It was found that the decoupling capability of the set-up is remarkably flexible and the impact and discussion of this finding is treated in a dedicated section  
 
TUPWO020 Error Analysis for C-ADS MEBT2 emittance, cavity, linac, beam-transport 1925
 
  • H. Geng, Z. Guo, Z. Li, C. Meng, S. Pei, J.Y. Tang
    IHEP, Beijing, People's Republic of China
  
  A local achromatic scheme has been developed for C-ADS MEBT2. This paper presents the error analysis results for this MEBT2 scheme. The effects of magnet and cavity misalignment, static and dynamic errors of electric and magnetic field, the displacement of the input beam as well as the initial mismatches of the incoming beam will be studied. Beam trajectory correction scheme will also be discussed.  
 
TUPWO034 Focusing Magnetic Field Design for a FEL Linac linac, focusing, electron, space-charge 1949
 
  • Q.S. Chen, Q. Fu, T. Hu, B. Qin, B. Wu, H. Zeng
    HUST, Wuhan, People's Republic of China
  • J. Li, Y.J. Pei
    USTC/NSRL, Hefei, Anhui, People's Republic of China
  
  A linac-based Free Electron Laser is planned to be built in Huazhong University of Science and Technology (HUST). As an important part of the whole project, the focusing magnetic field is carefully designed. Space-charge force is calculated at first to give a rough evaluation about the focusing field. Start-to-end simulation shows that the magnetic field has only great effect on spot size and phase space. With the final designed field, 10-ps-length pulse containing 200pC electrons can be got and the corresponding RMS emittance and RMS radius are 7 πmm•mrad and 0.25 mm, respectively. Finally, a new idea (double-peak scheme) is discussed and excitation current is proposed as the evaluation index.  
 
TUPWO037 Design Study of the Low Energy Beam Transport System at RISP rfq, emittance, beam-transport, ion 1955
 
  • E.-S. Kim
    KNU, Deagu, Republic of Korea
  • J. Bahng
    Kyungpook National University, Daegu, Republic of Korea
  • J. Qiang
    LBNL, Berkeley, California, USA
  
  We present the design status of LEBT for the RISP that consists of two 90 degree dipoles, a multi-harmonic buncher, pair solenoids, electrostatic quadrupoles and a high voltage platform. After ECR-IS with an energy of 10 keV/u, heavy-ion beams are selected by achromatic bending systems and then be bunched in the LEBT. A multi-harmonic buncher is used to achieve a small longitudinal emittance in the RFQ. We show the results on the optics design by using the TRANSPORT code and the beam tracking of two-charge beams by using the code IMPACT. We present the results and issues on beam dynamics simulaitons in the designed LEBT system.  
 
TUPWO059 Reducing Emittance of a H− Beam in a Solenoid-based Low-energy Beam Transport through Numerical Modeling simulation, emittance, rfq, electron 2000
 
  • J. von Stecher, D.L. Bruhwiler, B.T. Schwartz, S.A. Veitzer
    Tech-X, Boulder, Colorado, USA
  • B. Han, M.P. Stockli
    ORNL, Oak Ridge, Tennessee, USA
  
  Funding: This work is supported by the US DOE Office of Science, Office of Basic Energy Sciences, including grant No. DE-SC0000844
A solenoid-based low-energy beam transport (LEBT) subsystem is under development for the H− linac front end of the Spallation Neutron Source. The LEBT design includes MHz frequency chopping of the partially neutralized H− beam that can potentially lead to beam instabilities. We report results of numerical modeling using the parallel Vorpal framework for 3D electrostatic particle-in-cell (PIC) to simulate H− beam dynamics in the LEBT, over multiple chopping events. We detail how the addition of a positively biased potential barrier near the entrance of the chopper can improve LEBT performance by eliminating chopper-induced emittance increases over many chopping events.
DLB is now at University of Colorado, Boulder 		 
 
TUPWO060 Flat Electron Bunch Compression at the Advanced Superconducting Test Accelerator emittance, quadrupole, simulation, cathode 2003
 
  • C.R. Prokop, D. Mihalcea, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • B.E. Carlsten
    LANL, Los Alamos, New Mexico, USA
  • P. Piot, Y.-E. Sun
    Fermilab, Batavia, USA
  
  Funding: This work is supported by LANL LDRD #20110067DR and by the U.S. DOE contracts DE-FG02-08ER41532 and DE-AC02-07CH11359.
The generation of flat beam using round-to-flat beam conversion of an incoming canonical-angular-momentum dominated electron beam could have important application in the field of advanced acceleration techniques and accelerator-based light source. In this paper we explore the temporal compression of flat beams and especially compare the resulting phase space dilutions with the case of round beam. Finally, we propose and detail a possible experiment to investigate the flat-beam bunch compression at the Advanced Superconducting Test Accelerator currently in construction at Fermilab. 		 
 
WEOBB102 Design Integration of the FRIB Driver Linac linac, cryomodule, SRF, ion 2055
 
  • Y. Zhang, N.K. Bultman, F. Casagrande, C.P. Chu, A. Facco, P.E. Gibson, Z.Q. He, K. Holland, M. Leitner, Z. Liu, F. Marti, D. Morris, S. Peng, E. Pozdeyev, T. Russo, J. Wei, Y. Yamazaki, Z. Zheng
    FRIB, East Lansing, Michigan, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
FRIB driver linac will deliver all stable heavy ion beams with beam energy more than 200 MeV/u, and beam power on target up to 400 kW. As the first SRF linac for high power heavy ion beams, there are many technical challenges, and integration of all the accelerator components is important. In this paper, major issues on integration of the FRIB drive linac are introduced and the corresponding studies are discussed, which include developments of accelerator online model, minimize uncontrolled beam loss in the SRF linac for high power heavy ion beams, beam diagnostic systems for beam tuning and for machine protection system (MPS), secondary collimators for charge selection of multi charge state ion beams, beam loading and stability of LLRF control, proper degauss process with superconducting (SC) solenoids when combined with SC dipole correctors, vacuum system, cryogenic and distribution system, helium pressure drop and stability of the cryomodules. 		 
slides icon Slides WEOBB102 [3.557 MB]  
 
WEPWA083 Results of NSLS-II Linac Commissioning linac, emittance, dipole, quadrupole 2301
 
  • R.P. Fliller, A. Blednykh, J. Choi, M.A. Davidsaver, J.H. De Long, F. Gao, C. Gardner, Y. Hu, G. Jahnes, W. Jew, J. Klug, P. Marino, D. Padrazo, L. Pharr, R. Rainer, G. Ramirez, P. Ratzke, R. Raynis, J. Rose, M. Santana, S. Seletskiy, T.V. Shaftan, J. Shah, G. Shen, O. Singh, V.V. Smaluk, C. Sorrentino, K. Vetter, G.M. Wang, G.J. Weiner, X. Yang, L.-H. Yu, E. Zeitler
    BNL, Upton, Long Island, New York, USA
  • K. Dunkel, J.H. Hottenbacher, B. Keune, A. Metz, C. Piel
    RI Research Instruments GmbH, Bergisch Gladbach, Germany
  
  Funding: This manuscript has been authored by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy.
The NSLS-II linac is a 200 MeV normal conducting linac procured as a turn key system from Research Instruments. The linac and associated transport lines were installed at BNL in the winter of 2012. Commissioning activities started March 26 and lasted for 2.5 months. In this report we discuss the successful commissioning results of the linac, issues encountered, and the remaining work that needs to be accomplished for NSLS-II booster commissioning. 		 
 
WEPWO007 Shape Optimization of a SRF Injector Cavity emittance, cavity, cathode, electron 2322
 
  • J.K. Sekutowicz
    DESY, Hamburg, Germany
  • W.C. Grabowski, R. Nietubyć, T. Wasiewicz
    NCBJ, Świerk/Otwock, Poland
  
  In this contribution we present studies on the shape optimization of 1.6-cell cavity with solenoid for a 1-mA class photo injector, meant as an electron source for FEL facilities. The main criterion for the optimization was the lowest slice emittance. Inclination angle of the cavity back wall, solenoid position and magnetic field, amplitude of the accelerating field, and emission phase were varied in these studies in order to find the minimum of slice emittance at the distance of 1 m from a photocathode, located in center of the cavity back wall  
 
WEPEA033 Optimization of Injector System for Early Commissioning Phase of Compact-ERL. emittance, laser, space-charge, gun 2573
 
  • J.G. Hwang, E.-S. Kim
    Kyungpook National University, Daegu, Republic of Korea
  • T. Miyajima
    KEK, Ibaraki, Japan
  
  Injector system of Compact-Energy Recovery Linear accelerator, which is currently develping in Photon Factory of KEK at Japan, consists of the photo-cathode DC gun, two solenoids, a 1.3 GHz buncher ,three 1.3 GHz 2 cell injector cavities, 5 quadrupole magnet and merger section. Target values of beam produced by the injector system are kinetic energy of 5 MeV, the normalized transverse emittance of under 0.1 mm-mrad and the bunch length of under 3 ps with the 7.7 pC charge per bunch and the repetition rate of 1.3 Ghz. In this low energy region, the effect of the space charge is dominated to cause the emittance growth. The optimization is performed by using MOGA (Multi-Object Genetic Algorithm) with code GPT to consider the effect of space charge under optimization. The code General Particle Tracer (GPT) is a 3D Paricle-In-Cell(PIC) code based on multi-layer object-oriented design. Using this method with code GPT, the target values was achieved at the exit of the merger section such as the normalized emittance of 0.1 mm-mrad with bunch length of 3 ps and kinetic energy of 5 MeV.  
 
WEPEA074 Optimisation of the Beam Line for COMET Phase-I dipole, electron, background, target 2681
 
  • A. Kurup, I. Puri, Y. Uchida, Y. Yap
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • R. Appleby, S.C. Tygier
    UMAN, Manchester, United Kingdom
  • R.T.P. D'Arcy, A. Edmonds, M. Lancaster, M. Wing
    UCL, London, United Kingdom
  
  The COMET experiment will search for very rare muon processes that will give us an insight into particle physics beyond the Standard Model. COMET requires an intense beam of muons with a momentum less than 70 MeV/c. This is achieved using an 8 GeV proton beam; a heavy metal target to primarily produce pions; a solenoid capture system; and a curved solenoid to perform charge and momentum selection. It was recently proposed to build COMET is two phases with physics measurements being made in both phases. This requires re-optimising the beam line for a shorter curved solenoid. This will affect the pion and muon yield; the momentum distributions at the detector; and the collimator scheme required. This paper will present the beam line design for COMET Phase-I, which aims to maximise the yield for low momentum muons suppressing sources of backgrounds in the beam.  
 
WEPEA075 Large Emittance Beam Measurements for COMET Phase-I electron, simulation, proton, background 2684
 
  • A. Kurup, I. Puri, Y. Uchida, Y. Yap
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • R. Appleby, S.C. Tygier
    UMAN, Manchester, United Kingdom
  • R.T.P. D'Arcy, A. Edmonds, M. Lancaster, M. Wing
    UCL, London, United Kingdom
  
  The COMET experiment will search for very rare muon processes that will give us an insight into particle physics beyond the Standard Model. COMET requires an intense beam of muons with a momentum less than 70 MeV/c. This is achieved using an 8 GeV proton beam; a heavy metal target to primarily produce pions; a solenoid capture system; and a curved solenoid to perform charge and momentum selection. Understanding the pion production yield and transport properties of the beam line is an important part of the experiment. The beam line is a continuous solenoid channel, so it is only possible to place a beam diagnostic device at the end of the beam line. Building COMET in two phases provides the opportunity to investigate the pion production yield and to measure the transport properties of the beam line in Phase-I. This paper will demonstrate how this will be done using the experimental set up for COMET Phase-I.  
 
WEPFI019 High Power Test of Kanthal-coated L-band Lossy Cavity cavity, vacuum, positron, klystron 2744
 
  • F. Miyahara, Y. Arakida, Y. Higashi, T. Higo, K. Kakihara, S. Matsumoto
    KEK, Ibaraki, Japan
  • K. Saito
    Hitachi, Ltd., Energy and Environmental System Laboratory, Hitachi-shi, Japan
  • H. Sakurabata
    Hitachi, Ltd., Power & Industrial Systems R&D Laboratory, Ibaraki-ken, Japan
  
  We have been developing a Kanthal (Al-Cr-Fe)-coated collinear load as a possible candidate of the L-band acc. structure of SuperKEKB positron capture system. In order to achieve the higher capture efficiency comparing to that of KEKB, the upgrade of the e+ production and capture section is required. The system consists of a W target with a flux concentrator followed by acc. structures surrounded by solenoids. The increase of the e+ bunch charge and the reduction of satellite bunches are the main issues for this system. The frequency choice of L-band is based on the larger transverse and longitudinal acceptances than those of the S-band one. The load is preferable to compose the system with compact magnets and to minimize the dip in the solenoid field. The design of the load was reported in previous work*. We understand that the Kanthal-coated cell should be confirmed in high power to confirm the feasibility at our design field of 10 MV/m level. We are making a test cavity which consists of 3 cells and one of them is composed of Kanthal-coated disks to lower the intrinsic Q value from 20000 to the order of 1000. The cavity production and the experimental result will be reported.
*Development of L-band accelerating structure with Kanthal-coated collinear load for SuperKEKB, IPAC12, THLR04. 		 
 
WEPFI073 A Modular Cavity for Muon Ionization Cooling R&D cavity, simulation, coupling, vacuum 2860
 
  • D.L. Bowring, A.J. DeMello, A.R. Lambert, D. Li, S.P. Virostek, M.S. Zisman
    LBNL, Berkeley, California, USA
  • C. Adolphsen, L. Ge, A.A. Haase, K.H. Lee, Z. Li, D.W. Martin
    SLAC, Menlo Park, California, USA
  • D.M. Kaplan
    Illinois Institute of Technology, Chicago, Illinois, USA
  • T.H. Luo, D.J. Summers
    UMiss, University, Mississippi, USA
  • A. Moretti, M.A. Palmer, R.J. Pasquinelli, Y. Torun
    Fermilab, Batavia, USA
  • R.B. Palmer
    BNL, Upton, Long Island, New York, USA
  
  The Muon Accelerator Program (MAP) collaboration is developing an ionization cooling channel for muon beams. Ionization cooling channel designs call for the operation of high-gradient, normal-conducting RF cavities in multi-Tesla solenoidal magnetic fields. However, strong magnetic fields have been shown to limit the maximum achievable gradient in RF cavities. This gradient limit is characterized by RF breakdown and damage to the cavity surface. To study this issue, we have developed an experimental program based on a modular pillbox cavity operating at 805 MHz. The modular cavity design allows for the evaluation of different cavity materials - such as beryllium - which may ameliorate or circumvent RF breakdown triggers. Modular cavity components may furthermore be prepared with different surface treatments, such as high-temperature baking or chemical polishing. This poster presents the design and experimental status of the modular cavity, as well as future plans for the experimental program.  
 
WEPFI092 Multipacting Simulation of the MICE 201 MHz RF Cavity cavity, electron, simulation, coupling 2914
 
  • T.H. Luo, D.J. Summers
    UMiss, University, Mississippi, USA
  • D.L. Bowring, A.J. DeMello, D. Li, P. Pan, S.P. Virostek
    LBNL, Berkeley, California, USA
  • L. Ge
    SLAC, Menlo Park, California, USA
  
  The international Muon Ionization Cooling Experiment (MICE) aims to demonstrate transverse cooling of muon beams by ionization. The MICE ionization cooling channel requires eight 201-MHz normal conducting RF cavities to compensate for the longitudinal beam energy loss in the cooling channel. Multipacting is a resonant electron discharge produced by the synchronization of emitted electrons with the RF fields, which can cause breakdown at high power RF operation. In this paper, we present the study of the multipacting effect in the MICE 201 MHz cavities with the SLAC ACE3P code. The simulation is carried out in the cavity body, the RF coupler region, and the coaxial waveguide, with the external magnetic field from the Coupling Coil. We will identify potential RF breakdowns due to multipacting and propose a solution to suppress them.  
 
THPFI004 Progress on the SRF Linac Developments for the IFMIF-LIPAC Project cryomodule, linac, vacuum, SRF 3294
 
  • F. Orsini
    CEA/DSM/IRFU, France
  • P. Abramian, J. Calero, J.C. Calvo, J.L. Gutiérrez, T. Martínez de Alvaro, J. Munilla, I. Podadera, F. Toral
    CIEMAT, Madrid, Spain
  • N. Bazin, P. Brédy, P. Carbonnier, G. Devanz, G. Disset, N. Grouas, P. Hardy, V.M. Hennion, H. Jenhani, J. Migne, A. Mohamed, J. Neyret, J. Relland, B. Renard, D. Roudier
    CEA/IRFU, Gif-sur-Yvette, France
  
  In the framework of the International Fusion Materials Irradiation Facility (IFMIF), which consists of two high power accelerator drivers, each delivering a 125 mA deuteron beam at 40 MeV in CW, an accelerator prototype is presently under design and realization for the first phase of the project. This accelerator includes a SRF Linac, which is designed for the transportation and focalization of the deuteron beam up to 9 MeV. This SRF Linac is a large cryomodule of ~6 m long, working at 4.4 K and at the frequency of 175 MHz in continuous wave. It is mainly composed of 8 low-beta HWRs, 8 Solenoid Packages and 8 RF Power Couplers. This paper focuses on the recent developments and changes made on the SRF Linac design: following the abandon of the HWR frequency tuning system, initially based on a plunger located inside the central region of the resonator, a new external tuning system has been designed, implying a complete redesign of the resonator and consequently impacting the cryomodule lattice. The recent changes in the design are presented in this paper. In addition, cold tests were performed on a HWR prototype and cold tests results of the magnets prototypes are also presented.  
 
THPME002 Compact High-Tc 2G Superconducting Solenoid for Superconducting RF Electron Gun cavity, gun, electron, SRF 3514
 
  • G. Nielsen, A. Baurichter, N. Hauge, E.K. Krauthammer
    Danfysik A/S, Taastrup, Denmark
  
  A solenoid with second generation (2G) high-temperature superconducting (HTS) coils for use in the superconducting RF electron gun of the WiFEL free electron laser at the University of Wisconsin, Madison, has successfully been designed, manufactured, tested and magnetically characterized at Danfysik. The solenoid is designed to operate in the temperature range between 5 K and 70 K. A stack of 16 serially connected pancake coils wound from SuperPower 2G HTS-tape is mounted inside a cylindrical iron yoke with end caps. The solenoid was designed with an excitation current margin of at least 130 % of the nominal operation current in the whole temperature range. At operation, 17.2 kA-turns yield a center field of 0.20 T and a field integral of 3.1 T2 mm, with very small integrated field errors. With a yoke outer diameter of 176 mm and a total length of 136 mm, the solenoid is very compact, and can therefore be placed very close to the RF cavity, improving its emittance compensating efficiency. Careful magnetic design minimizes the leak field at the SC cavity surface. Heat dissipation is negligible hence conduction cooling through copper braids attached to the iron yoke is sufficient.  
 
THPME019 Design of the Cold Mass Support Assembly of Test Cryomodule for IMP ADS-Injector II cavity, controls, cryomodule, vacuum 3543
 
  • Y. Liu, S. Sun, J. Wang, L. Wang, S.Y. Wang
    SINAP, Shanghai, People's Republic of China
  • X.L. Guo
    JiangShu University, Jiangsu Province, People's Republic of China
  
  In order to test the performance of the HWR cavities and verify the related technique for cooling of the cavities and the solenoids together, a test cryomodule (TCM1) containing one superconducting HWR cavity followed by one cold BPM and two superconducting solenoids was developed for the Injector II of the Accelerator Driven Sub-critical System (ADS). The TCM1 consists of the cryostat and the cold mass assembly. The cryostat is composed of vacuum chamber, thermal shields, cooling circuit, cold mass support assembly, and instrumentation. A set of cold mass support assembly was developed for supporting the cold mass working at 4.4 K. The support assembly mainly consists of Ti support frame, stainless steel rods, adjustable mechanisms and LHe cooling passage. It can not only support the weight of the cold mass but also stand the thermal stress during the cool down. In order not to affect the performance of the cavity, it will not impose any force on the HWR cavity. It can be adjustable for alignment of the cold mass both at room temperature and 4.4 K. This paper provides the detailed design of the TCM1 cold mass support assembly.  
 
THPME020 Design of a Test Cryomodule for IMP ADS-Injector II cavity, cryomodule, vacuum, radiation 3546
 
  • L. Wang, Y. Liu, S. Sun, J. Wang, S.Y. Wang, S.H. Wang
    SINAP, Shanghai, People's Republic of China
  • X.L. Guo
    JiangShu University, Jiangsu Province, People's Republic of China
  
  Two cryomodules are to be applied for the Injector II of the Accelerator Driven Sub-critical System. Each of them will contain 8 superconducting HWR cavities and 9 superconducting solenoids. In order to test the performance of the HWR cavities and validate related technique for cooling of cavities and solenoids together, a test cryomodule (TCM1) including one HWR cavity and two solenoids was developed. The design of the TCM1 cryostat was carried out by the Shanghai Institute of Applied Physics, CAS. Both the cavity and the solenoids will work at 4.4 K by bath cooling. The fast cooling down for the cavity from 100 K to 120 K is required to avoid degrading of the cavity performance. Before energization, the solenoids can be warmed up to above 10 K and re-cooled down for degaussing. The TCM1 can not only be cooled by using the dewar-filling system, but also operated by the refrigerator system. The main components of the cryostat include vacuum chamber, thermal shields, magnet current leads, cooling circuit, and cold mass support assembly. This paper presents the detailed design of the TCM1 cryostat.  
 
THPME048 Assembly and Test of a Modified Spectrometer Solenoid for MICE radiation, target, controls, coupling 3621
 
  • S.P. Virostek, D. Li, P. Pan, S. Prestemon
    LBNL, Berkeley, California, USA
  • R. Preece
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  
  Funding: This work is supported by the Office of Science, US-DOE under DOE contract DE-AC02-05CH11231.
The MICE superconducting spectrometer solenoids have been modified and rebuilt as a result of the testing done in 2008, 2009 and 2010. The number of two-stage cryocoolers was increased from three in 2009 to five in the modified magnet. The new shield for the spectrometer solenoid is fabricated primarily from 1100-O aluminum instead of 6061-T6 aluminum used in the former versions of the magnet. The thermal connection between the shield and the first-stage of the cold heads has been improved to reduce the temperature drop between the shield and the coolers. As a result of these changes, the first-stage temperatures for the coolers are below 45K, which resulted in an increase in the refrigeration generated by the cooler second stages. The quench protection system has been altered in order to provide additional protection to the magnet in the event of a lead failure between the magnet power supply and the magnet coils. The quality of the shield and cold mass MLI wrap has also been improved. Details of the modifications and test results demonstrating improved magnet performance are presented in this paper. 		 
 
THPWA013 Direct Diagnostic Technique of High-intensity Laser Profile based on Laser-Compton Scattering laser, electron, gun, cathode 3657
 
  • Y. Yoshida, A. Endo, K. Sakaue, R. Sato, M. Washio
    Waseda University, Tokyo, Japan
  
  Funding: Work supported by NEDO (New Energy and Industrial Technology Development Organization).
A high-intensity laser is essential for the LPP (Laser Produced Plasma) EUV generation, which is studied as the next generation light source of ultra-fine semiconductor lithography. Nevertheless, there is no way to directly measure the profile of high-intensity laser. Therefore, we have been developing a method for measuring high-intensity laser profile based on the laser-Compton scattering using a Cs-Te photo cathode RF-Gun at Waseda University. In this diagnostic technique, laser profile is obtained by scanning the extremely-focused electron beam, which is about 10μm by solenoid lens. We have obtained the 10μm beam size by solenoid lens using tracking code GPT (General Particle Tracer) by optimizing the beam parameter and lens shape. Recently, we have installed solenoid lens and generated focused beam. The focused beam size was evaluated by using radiochromic film called GAFCHROMIC dosimetry film type HD-810. In this conference, we will report the results of GPT simulations, beam size measurements and future prospects. 		 
 
THPWA041 Acceptance and Transmission Simulations of the FETS RFQ emittance, rfq, simulation, space-charge 3720
 
  • S. Jolly, R.T.P. D'Arcy
    UCL, London, United Kingdom
  • A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • J.K. Pozimski
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • J.K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  
  A 4m-long, 324MHz four-vane RFQ, consisting of four coupled sections, has been designed for the Front End Test Stand (FETS) at RAL in the UK. A novel design method, integrating the CAD and electromagnetic design of the RFQ with beam dynamics simulations, was used to optimise the design of the RFQ. With the design of the RFQ fixed, the focus has been on optimising the transmission of the RFQ at 3 MeV and matching the output of the FETS Low Energy Beam Transport (LEBT) to the RFQ acceptance. Extensive simulations have been carried out using General Particle Tracer (GPT) to map out the acceptance of the FETS RFQ for a 65 keV H− input beam. Particular attention has focussed on optimising the simulations to match the optimised output of the FETS Penning-type H− ion source. Results are presented of the transverse phase space limits on the RFQ input acceptance in both the zero current and full space charge regimes.  
 
THPWO003 Final Design of the IFMIF Injector at CEA/Saclay extraction, rfq, simulation, diagnostics 3758
 
  • R. Gobin, D. Bogard, N. Chauvin, O. Delferrière, P. Girardot, F. Harrault, J.L. Jannin, D. Loiseau, C. Marolles, P. Mattei, A. Roger, F. Senée, O. Tuske
    CEA/DSM/IRFU, France
  • H. Shidara
    IFMIF/EVEDA, Rokkasho, Japan
  
  The IFMIF accelerator dedicated to high neutron flux production for material studies is now entering in a new phase. For this irradiation tool, IRFU institute from CEA/Saclay is in charge of the design, construction and characterization of the Injector. The high intensity deuteron beam is produced by an ECR source located on a 100 kV platform. The 2 m long LEBT, based on 2 solenoids, is ended by a cone installed at the entrance of the RFQ. Specific diagnostics (cameras, Allison type emittance scanner, fiberscope) have been installed for the beam characterization. During the last weeks, after Injector conditioning, more than 100 mA of deuteron beams have been characterized after the RFQ entrance cone in pulsed and continuous mode*. The shipment of the Injector towards the Rokkasho site in Japan (where it will be reinstalled) is foreseen at the beginning of 2013. This paper will focus on the final design used during the beam characterization experiments at Saclay.
* N. Chauvin et al. this conference 		 
 
THPWO005 Commissioning of the Spiral2 Deuteron Injector rfq, proton, emittance, space-charge 3764
 
  • D. Uriot, O. Tuske
    CEA/DSM/IRFU, France
  • J.-L. Biarrotte
    IPN, Orsay, France
  
  The SPIRAL-2 superconducting linac driver, which aims at delivering 5 mA, 40 MeV deuterons and up to 1 mA, 14.5 A.MeV q/A=1/3 heavy ions, has now entered its construction phase in GANIL (Caen, France). The linac is composed of two injectors feeding one single RFQ, followed by a superconducting section based on 88 MHz independently-phased quarter-wave cavities with room temperature focusing elements. The protons/deuteron injector have been fully built and commissioned at CEA Saclay in 2012, before moving and final installation at GANIL in 2013. Beam emittances have been measured at different positions of the LEBT and especially at the RFQ injection point. The space-charge beam compensation has been also carefully studied. This paper describes all the results obtained during this commissioning.  
 
THPWO006 Beam Commissioning of the Linear IFMIF Prototype Accelerator Injector: Measurements and Simulations emittance, simulation, ion-source, ion 3767
 
  • N. Chauvin, S. Chel, O. Delferrière, R. Gobin, P.A.P. Nghiem, F. Senée, M. Valette
    CEA/IRFU, Gif-sur-Yvette, France
  • A. Mosnier
    Fusion for Energy, Garching, Germany
  • Y. Okumura
    JAEA, Rokkasho, Japan
  • H. Shidara
    IFMIF/EVEDA, Rokkasho, Japan
  • D. Uriot
    CEA/DSM/IRFU, France
  
  The EVEDA (Engineering Validation and Engineering Design Activities) phase of the IFMIF (International Fusion Materials Irradiation Facility) project consists in building, testing and operating, in Japan, a 125 mA/9 MeV deuteron accelerator, called LIPAc, which has been developed in Europe. The 140 mA cw D+ beam that has to be delivered by the LIPAc injector is produced by a 2.45 GHz ECR ion source based on the SILHI design. The low energy beam transfer line (LEBT) relies on a dual solenoid focusing system to transport the beam and to match it into the RFQ*. The beam line is equipped by several diagnostics: intensity measurement, emittance measurement unit, profilers and beam proportion analysis. During the LIPAc injector beam commissioning performed in CEA-Saclay, the deuteron beam intensity transported at the end of the LEBT reached an unprecedented value of 140 mA at 100 keV. In this paper, the results obtained during the commissioning are presented. In particular, beam emittance measurements as a function of duty cycle, extracted current from the ion source and solenoid tunings are exposed. The experimental results are discussed and compared to beam dynamics simulations.
* R. Gobin et al., this conference 		 
 
THPWO007 Advanced Superconducting CW Heavy Ion Linac R&D cavity, linac, ion, heavy-ion 3770
 
  • W.A. Barth, S. Mickat, A. Orzhekhovskaya
    GSI, Darmstadt, Germany
  • M. Amberg, K. Aulenbacher, V. Gettmann, S. Jacke
    HIM, Mainz, Germany
  • F.D. Dziuba, H. Podlech, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  
  An advanced upgrade program has to be realized in the next years, such that enhanced primary beam intensities are available. For this a new sc 28 GHz full performance ECR ion source has to be established. Via a new low energy beam line an already installed new RFQ and an IH-DTL will provide for cw-heavy ion beams with high average beam intensity. It is foreseen to build a new cw-heavy ion-linac behind this high charge state injector. In preparation an advanced R&D program is defined: The first linac section comprising a sc CH-cavity embedded by two sc solenoids (financed by HIM and partly by HGF-ARD-initiative) as a demonstrator will be tested in 2014). After successfull testing an advanced cryomodule comprising up to 4 rf cavities is foreseen. First layout scenarios of this advanced test bench will be presented.  
 
THPWO016 Superconducting CH Cavities for Heavy Ion Acceleration cavity, linac, cryomodule, status 3794
 
  • F.D. Dziuba, M. Amberg, M. Busch, H. Podlech, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • M. Amberg, K. Aulenbacher, W.A. Barth, S. Mickat
    HIM, Mainz, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
  • W.A. Barth, S. Mickat
    GSI, Darmstadt, Germany
  
  Funding: Work supported by HIM, GSI and BMBF Contr. No. 06FY7102
To demonstrate the operation ability of superconducting (sc) Crossbar-H-mode (CH) cavity technology a 217 MHz structure of this type is under development at the Institute for Applied Physics (IAP) of Frankfurt University. The cavity has 15 accelerating cells and a design beta of 0.059. It will be equipped with all necessary auxiliaries like a 10 kW power coupler and a tuning system. Currently, the cavity is under construction. Furthermore, this cavity will serve as demonstrator for a sc continuous wave (cw) LINAC at GSI. The proposed cw LINAC is highly requested to fulfil the requirements of nuclear chemistry and especially for a competitive production of new Super Heavy Elements (SHE) in the future. A full performance test by injecting and accelerating a beam from the GSI High Charge Injector (HLI) is planned in 2014. The current status of the sc CH cavity and the demonstrator project is presented. 		 
 
THPWO040 Progress of Injector-1 and Main Linac of Chinese ADS Proton Accelerator cavity, rfq, linac, proton 3854
 
  • Y.L. Chi, J. Cao, J.P. Dai, H. Dong, L. Dong, T.M. Huang, X. Jing, S.P. Li, Z. Li, Z.Q. Li, Z.C. Liu, F. Long, Z. Ma, H.F. Ouyang, W.M. Pan, Q.L. Peng, P. Su, Y.F. Sui, J.Y. Tang, J.L. Wang, Q.B. Wang, Q. Ye, Z.S. Zhou
    IHEP, Beijing, People's Republic of China
  
  China ADS study program was Supported by the "Strategic Priority Research Program " of the Chinese Academy of Sciences at 2011, which aims to design and build an ADS demonstration facility with the capability of more than 1000 MW thermal power in about twenty years. The driver Linac is defined to be1.5 GeV in energy, 10mA in current and in CW operation mode. To meet the extremely high reliability and availability of ADS, the Linac is designed with much installed margin and fault tolerance. ADS accelerator is composed of two parallel 10MeV injectors and a main Linac. The superconducting acceleration structures are employed except the RFQs. This paper will present design of the China ADS accelerator and related key technology developments.  
 
THPWO044 Error Analysis and Beam Loss Control in C-ADS Main Linac linac, simulation, emittance, cavity 3866
 
  • C. Meng, Z. Li, J.Y. Tang, F. Yan
    IHEP, Beijing, People's Republic of China
  
  The China ADS (C-ADS) driver linac is defined to deliver a CW proton beam of 1.5 GeV in energy and 10 mA in current. To meet the extremely high reliability and availability, it is very important and imperative to perform detailed error analysis to simulate the real machine, where the errors always exist. The error studies are by very intense macro-particle simulations by both Trace-Win and TRACK codes with space charge effects included. Through error analysis the proper closed-orbit correction scheme and the maximum tolerable hardware and alignment errors can be found. This paper presents the method to optimize the apertures of elements in the C-ADS main linac. According to the detailed sensitivity analysis of different errors, the static and dynamic errors for the main linac are proposed. The basic lattice scheme has also been re-optimized based on the error studies. The correction scheme is also described, and with the correction scheme the residual orbit can be controlled very well. The influence of the correctors and BPM failures on the correction scheme is also studied.  
 
THPWO076 Design Study for 10 MHz Beam Frequency of Post-accelerated RIBs at HIE-ISOLDE rfq, emittance, bunching, linac 3933
 
  • M.A. Fraser, R. Calaga, I.-B. Magdau
    CERN, Geneva, Switzerland
  
  An increased bunch spacing of approximately 100 ns is requested by several research groups targeting experimental physics at HIE-ISOLDE. A design study testing the feasibility of retrofitting the existing 101.28 MHz REX (Radioactive ion beam EXperiment) RFQ with a sub-harmonic external pre-buncher at the ISOLDE radioactive nuclear beam facility has been carried out as a means of decreasing the beam frequency by a factor of 10. The proposed scheme for the 10 MHz bunch repetition frequency is presented and its performance assessed with beam dynamics simulations. The opportunity to reduce the longitudinal emittance formed in the RFQ is discussed along with the options for chopping the satellite bunches populated in the bunching process.  
 
THPWO082 Commissioning of the Linac4 RFQ at the 3 MeV Test Stand rfq, linac, diagnostics, emittance 3951
 
  • C. Rossi, L. Arnaudon, G. Bellodi, J.C. Broere, O. Brunner, A.M. Lombardi, J. Marques Balula, P. Martinez Yanez, J. Noirjean, C. Pasquino, U. Raich, F. Roncarolo, M. Vretenar
    CERN, Geneva, Switzerland
  • M. Desmons, A. France, O. Piquet
    CEA/IRFU, Gif-sur-Yvette, France
  
  Linac4, the future 160MeV H− injector to the CERN Proton Synchrotron Booster, is presently under construction at CERN as a first step of the planned upgrade of the LHC injectors. The low energy section of LINAC4, consisting of an ion source, a 352.2 MHz Radio Frequency Quadrupole (RFQ) and a chopper line is being commissioned in a dedicated test stand before installation in its final position in the tunnel. The RFQ is designed to accelerate a 45 keV, 70 mA, H− beam to 3 MeV, with an efficiency of 95% while preserving the transverse emittance. The RFQ, a four-vane structure 3 m in length, has been designed in collaboration with CEA/IRFU and it has been built at the CERN workshop. The precise fabrication has allowed to achieve a field flatness of 1%. The completion of the accelerating structure in September 2012 was followed by a complete series of bead-pull measurements and by high-power conditioning to the nominal power of 0.39 MW corresponding to a voltage of 78 kV across the 3 meters. Measurements with beam are foreseen during the first half of 2013. This paper reports the results of the low-power and high power RF commissioning as well as the status of beam measurements.  
 
THPWO092 Update of Beam Optics and SRF Cavities for Project X linac, cavity, cryomodule, optics 3975
 
  • T.N. Khabiboulline, P. Berrutti, V.A. Lebedev, A. Lunin, T.H. Nicol, J.-F. Ostiguy, T.J. Peterson, L. Ristori, A. Saini, N. Solyak, V.P. Yakovlev
    Fermilab, Batavia, USA
  
  The Project X staging [1] requires reconsideration of the beam optics and thus, the SRF system for the 3 GeV CW linac of the Project X. The revised beam optics is presented in the paper as well as revised cavity design for SSR2 section and a new concept of the linac segmentation. The new versions for the Project X cryo-modules for the SSR2 section, low-beta 650 MHz section and high-beta 650 MHz section are discussed. The beam extraction scheme at 1 GeV is discussed also. [1] S. Holmes, “Project X News, Strategy, Meeting Goals,” 2012 Fall Project X Collaboration Meeting, 27-28 November 2012, Fermilab.