Keyword: rfq
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MOOP01 The SARAF-LINAC Project Status linac, cryomodule, status, solenoid 38
 
  • N. Pichoff, B. Gastineau, P. Girardot
    CEA/DSM/IRFU, France
  • N. Bazin, D. Chirpaz-Cerbat, B. Dalena, G. Ferrand, P. Gastinel, F. Gougnaud, M. Jacquemet, C. Madec, P.A.P. Nghiem, D. Uriot
    CEA/IRFU, Gif-sur-Yvette, France
  • P. Bertrand, M. Di Giacomo, R. Ferdinand, J.-M. Lagniel
    GANIL, Caen, France
  
  SNRC and CEA collaborate to the upgrade of the SARAF accelerator to 5 mA CW 40 MeV deuteron and proton beams (Phase 2). CEA is in charge of the design, construction and commissioning of the superconducting linac (SARAF-LINAC Project). This paper presents to the accelerator community the status at August 2016 of the SARAF-LINAC Project.  
slides icon Slides MOOP01 [4.978 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP01  
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MOOP02 Current Status of Superconducting Linac for the Rare Isotope Science Project linac, cryomodule, cavity, ion 41
 
  • H.J. Kim, I.S. Hong, H.C. Jung, W.K. Kim, Y.H. Kim, Y. Kim, B.-S. Park, I. Shin
    IBS, Daejeon, Republic of Korea
  
  The RISP (Rare Isotope Science Project) has been proposed as a multi-purpose accelerator facility for providing beams of exotic rare isotopes of various energies. It can deliver ions from proton to uranium. Proton and uranium ions are accelerated upto 600 MeV and 200 MeV/u respectively. The facility consists of three superconducting linacs of which superconducting cavities are independently phased. Requirement of the linac design is especially high for acceleration of multiple charge beams. We present the RISP linac design, the prototyping of superconducting cavity and cryomodule.  
slides icon Slides MOOP02 [5.566 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOOP02  
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MOPRC007 Status of and Plans for the Beam Dynamics Program DYNAC space-charge, target, beam-transport, proton 80
 
  • E. Tanke, M. Eshraqi, Y.I. Levinsen, A. Ponton
    ESS, Lund, Sweden
  • S. Valero
    CEA, Gif-sur-Yvette, France
  
  A short introduction to the linac beam dynamics code DYNAC will be given. Recently implemented features, such as a Graphical User Interface (GUI), will be presented and benchmarking of the Radio Frequency Quadrupole (RFQ) model will be discussed. Additional planned features to DYNAC and the GUI will be touched upon.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC007  
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MOPRC016 RF-Track: Beam Tracking in Field Maps Including Space-Charge Effects, Features and Benchmarks space-charge, linac, ion, simulation 104
 
  • A. Latina
    CERN, Geneva, Switzerland
  
  RF-Track is a novel tracking code developed at CERN for the optimization of low-energy ion linacs in presence of space-charge effects. RF-Track features great flexibility and rapid simulation speed. It can transport beams of particles with arbitrary mass and charge even mixed together, solving fully relativistic equations of motion. It implements direct space-charge effects in a physically consistent manner, using parallel algorithms. It can simulate bunched beams as well as continuous ones, and transport through conventional elements as well as through maps of oscillating radio-frequency fields. RF-Track is written in optimized and parallel C++, and it uses the scripting languages Octave and Python as user interfaces. RF-Track has been tested successfully in several cases. The main features of the code and the results of its benchmark studies are presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC016  
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MOPRC020 Primary Beam Dynamic Simulation of Double Drift Double Buncher System for SPES Project solenoid, simulation, ion, focusing 117
 
  • A.V. Ziiatdinova
    MEPhI, Moscow, Russia
  • L. Bellan, M. Comunian, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • A.V. Ziiatdinova
    ITEP, Moscow, Russia
  
  SPES (Selective Production of Exotic Species) is a facility intended for production of neutron-rich Radioactive Ion Beams (RIBs) at the National Institute of Nuclear Physics (INFN-LNL, Legnaro, Italy). Exotic nuclei production based on the ISOL (Isotope Separation On-Line) technology using UCx target. Neutron-rich nuclei will be generated by uranium fission under the influence of proton beam from cyclotron. After that, RIBs will be reaccelerated by the ALPI (Acceleratore Lineare Per Ioni). RFQ (Radio Frequency Quadrupole) will be used as a front-end part of the ALPI. Double drift double buncher system is planned to install before RFQ for increasing transmission. This article is dedicated to beam dynamic simulation and laying-out of transport line at section before ALPI.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPRC020  
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MOPLR049 Design of a 750 MHz IH Structure for Medical Applications DTL, dipole, linac, proton 240
 
  • S. Benedetti, A. Grudiev, A. Latina
    CERN, Geneva, Switzerland
  
  Low velocity particles are critical in every hadron accelerator chain. While RFQs nicely cover the first MeV/u range, providing both acceleration and bunching, energies higher than few MeV/u require different structures, depending on the specific application. In the framework of the TULIP project [1], a 750 MHz IH structure was designed, in order to cover the 5-10 MeV/u range. The relatively high operating frequency and small bore aperture radius led the choice towards TE mode structures over more classic DTLs. Hereafter, the RF regular cell and end cell optimization is presented. An innovative solution to compensate dipole kicks is discussed, together with the beam dynamics and the matching with the 5 MeV 750 MHz CERN RFQ [2]. This structure was specifically designed for medical applications with a duty cycle of about 1 ', but can easily adapted to duty cycles up to 5 %, typical of PET isotopes production in hospitals.  
poster icon Poster MOPLR049 [3.212 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR049  
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MOPLR052 LEBT Commissioning of the J-PARC LINAC linac, extraction, ion, beam-transport 251
 
  • T. Shibata, K. Ikegami, T. Maruta, K. Ohkoshi
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • H. Asano, Y. Kondo, A. Miura, H. Oguri
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Liu
    KEK/JAEA, Ibaraki-Ken, Japan
  • F. Naito, A. Takagi
    KEK, Tokai, Ibaraki, Japan
  
  After upgrade of J-PARC Linac in 2014, Low Energy Beam Transport (LEBT) beam commissioning of the J-PARC LINAC has been made for improving H-beam intensity extracted from Linac. Currents of two solenoid coils and steering magnets in LEBT are optimized with extraction and acceleration voltages for static acceleration in ion source (IS) which decides on an initial emittance diagram of H− beam. As a result of LEBT and IS parameter optimization, beam transmission rate of RFQ has been reached up to 96 % in 50 mA H− current operation. Moreover, PIC-MC (Particle-In-Cell Monte-Carlo) simulation model is developed for H− transport in LEBT. Comparison between experimental and numerical results are presented to clarify beam physics from IS exit to RFQ entrance.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR052  
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MOPLR053 Operating Status of Injector II RFQ for C-ADS Project cavity, coupling, impedance, scattering 254
 
  • L.P. Sun, Y. He, C.X. Li, L. Lu, A. Shi, L.B. Shi, W.B. Wang, X.B. Xu, Z.L. Zhang, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  
  The Radio Frequency Quadrupole system has been designed and constructed for C-ADS (Chinese Accelerator Driven System) Injector II in Institute of Modern Physics (IMP), Chinese Academy of Sciences, which has been running for more than one year until now. It is a quadrilateral four-vane resonator with two equal couplers operating in CW mode. In the paper, RF system upgrade will be presented in detail，especially the two-port configuration was introduced and the conditioning based on two new sets of solid-state amplifier instead of the original tetrodes power source due to system hardware upgrade are described in the paper.
RFQ, solid-state amplifier, two-port configuration, coupler 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR053  
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MOPLR054 Progress and Operation Experiences of the J-PARC Linac linac, operation, ion, ion-source 257
 
  • K. Hasegawa
    JAEA/J-PARC, Tokai-mura, Japan
  
  The J-PARC linac started beam commissioning in 2006 and has delivered beam to users since 2008. The linac had been operated with a beam energy of 181 MeV and a peak beam current of 15-20 mA, which corresponds to the 3 GeV Rapid Cycling Synchrotron (RCS) beam power of 300 kW. An energy of 400 MeV and higher peak beam current of 50 mA linac was required to reach the goal of the J-PARC project. For the beam energy upgrade, we installed a new accelerating structure, Annular-ring Coupled Structure linac (ACS) in 2013. The ion source and the Radio Frequency Quadrupole linac were replaced to increase the peak beam current in 2014. Since then, the linac provides beams to demonstrate a 1 MW equivalent beam at the RCS and also for routine operation for user programs. The progress and operation experiences of the J-PARC linac are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR054  
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MOPLR057 Commissioning of the High Intensity Proton Source Developed at INFN-LNS for the European Spallation Source proton, solenoid, plasma, diagnostics 261
 
  • L. Neri, L. Allegra, A. Amato, G. Calabrese, A.C. Caruso, G. Castro, L. Celona, F. Chines, G. Gallo, S. Gammino, O. Leonardi, A. Longhitano, G. Manno, S. Marletta, D. Mascali, A. Massara, A. Maugeri, S. Passarello, G. Pastore, A. Seminara, A. Spartà, G. Torrisi, S. Vinciguerra
    INFN/LNS, Catania, Italy
  • M.J. Ferreira, O. Midttun
    ESS, Lund, Sweden
  • O. Midttun
    University of Bergen, Bergen, Norway
  
  At the Istituto Nazionale di Fisica Nucleare-Laboratori Nazionali del Sud (INFN-LNS) the commissioning of the high intensity Proton Source for the European Spallation Source (PS-ESS) started some weeks ago. Beam stability at high current intensity is one of the most important parameter for the first steps of the ongoing commissioning. Commissioning plan and preliminary characterization are also presented, with the aim to satisfy the requirement above.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR057  
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MOPLR060 CIADS Normal Temperature Front-End Design emittance, proton, ion, ion-source 267
 
  • W.L. Chen, W.P. Dou, Y. He, H. Jia, S.H. Liu, Y.S. Qin, Z.J. Wang
    IMP/CAS, Lanzhou, People's Republic of China
  
  The design and construction with several tens of megawatts superconducting accelerator is the developing direction in the further. The superconducting section follows the RFQ and MEBT, which needs good enough beam quality. The normal temperature front ends are redesigned for China Initiative ADS. The LEBT transports a 35KeV, 10mA DC proton beam to the RFQ, after the RFQ acceleration the MEBT transports a 2.1MeV 10mA CW proton beam to the superconducting DTL. The "Point Source" is proposed in the beam scrape application during the LEBT section to get the ideal transverse beam parameters. To get the ideal longitudinal beam parameters, the new RFQ is designed with little emittance. Collimators are installed in the new MEBT to scrape the outer sphere beams which may turn to halo. Details of the beam dynamics simulations will be given.  
poster icon Poster MOPLR060 [1.109 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR060  
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MOPLR062 European Spallation Source (ESS) Normal Conducting Front End Status Report proton, plasma, cavity, status 274
 
  • W. Wittmer, P.O. Gustavsson, F. Hellström, G. Hulla
    ESS, Lund, Sweden
  • I. Bustinduy, P.J. González, G. Harper, S. Varnasseri, C. de la Cruz
    ESS Bilbao, Zamudio, Spain
  • L. Celona, S. Gammino, L. Neri
    INFN/LNS, Catania, Italy
  • A.C. Chauveau, D. Chirpaz-Cerbat
    CEA/IRFU, Gif-sur-Yvette, France
  • F. Grespan, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • P. Mereu
    INFN-Torino, Torino, Italy
  • O. Midttun
    University of Bergen, Bergen, Norway
  • O. Piquet, B. Pottin
    CEA/DSM/IRFU, France
  
  The European Spallation Source (ESS) will deliver first protons on target by mid 2019. Civil construction of the accelerator tunnel has made good progress and will allow starting installation of the normal conducting frond end (NCFE) by end of 2017. To achieve these milestones the design of all major beam line components have been completed and the construction of the subsystems begun. We report on the advancement of the subsystems and the commissioning progress of the microwave discharge Proton Source (PS-ESS).  
poster icon Poster MOPLR062 [1.396 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR062  
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MOPLR067 First High Power Tests at the 325 MHz RF Test Stand at GSI cavity, linac, coupling, klystron 287
 
  • G. Schreiber, E. Plechov, J. Salvatore, B. Schlitt, A. Schnase, M. Vossberg
    GSI, Darmstadt, Germany
  
  A dedicated RF test stand for testing RF components and accelerating structures at 325 MHz has been put into operation at GSI. It allows testing the klystrons and circulators as well as the RFQ and the CH-acceleration cavities for the planned FAIR proton linac (p-Linac) and further cavity projects. The system integration has been completed and first high power tests with the CH prototype cavity were successfully performed. The operation parameters are 2 Hz repetition rate and 200 microseconds pulse length. Investigations on the critical path from wave guide to coaxial high power cavity coupler have been made. Performance measurements of the klystron, circulator and directional couplers with up to 2.8 MW on dummy load and the following conditioning process of the CH-prototype cavity with its coupled RF structures will be presented. Additionally the results of the conditioning of a ladder RFQ prototype are shown.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR067  
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MOPLR071 A 3-MeV Linac for Development of Accelerator Components at J-PARC linac, laser, operation, ion 298
 
  • Y. Kondo, H. Asano, E. Chishiro, K. Hirano, T. Itou, Y. Kawane, N. Kikuzawa, S.I. Meigo, A. Miura, S. Mizobata, T. Morishita, H. Oguri, K. Ohkoshi, A. Ohzone, Y. Sato, S. Shinozaki, K. Shinto, H. Takei, K. Tsutsumi
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Z. Fang, Y. Fukui, K. Futatsukawa, K. Ikegami, T. Miyao, K. Nanmo, T. Shibata, T. Sugimura, A. Takagi
    KEK, Ibaraki, Japan
  • T. Hori
    Nippon Advanced Technology Co., Ltd., Tokai, Japan
  • T. Ishiyama, T. Maruta
    KEK/JAEA, Ibaraki-Ken, Japan
  • M. Mayama, Y. Sawabe
    Mitsubishi Electric System & Service Co., Ltd, Tsukuba, Japan
  
  We are constructing a linac for development of accelerator components at J-PARC. This linac consists of a H− ion source, a low energy beam transport (LEBT), an radio frequency quadrupole (RFQ) linac, and a diagnostics bean line. The beam energy is 3 MeV, the beam current is 30 mA, and the duty factor is 0.6%, which corresponds to 0.5 kW. The accelerator itself has a capacity of at least 1 kW. However, the beam power is limited by radiation dose, because there are no radiation shields between the accessible area during the operation. The source and LEBT are same as the J-PARC linac's. The RFQ is a used one in the J-PARC linac, called RFQ I. At first, we are planning to conduct experiments of the laser charge exchange development for the transmutation facility. Then, this linac will be used for the development accelerator components such as beam scrapers, bunch shape monitors, laser profile monitors, and so on. We will be able to install new devices into the actual J-PARC linac after the full testing. The development of H− ion source can be carried out at this system, and also RFQ in the future. In this paper, present status of this 3-MeV linac at J-PARC is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-MOPLR071  
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TU1A01 Review on Trends in Normal Conducting Linacs for Protons, Ions and Electrons, With Emphasis on New Technologies and Applications linac, DTL, proton, electron 336
 
  • F. Gerigk
    CERN, Geneva, Switzerland
  
  In recent years a lot of attention was given to developments in the field of superconducting cavities. While these cavities can save operating costs and shorten the length of linacs, there are many applications and circumstances where normal conducting cavities are superior. This talk reviews some of the normal conducting linacs, which have been either recently commissioned, or which are currently under construction or in the design phase. Focus will be given to the choice between normal and superconducting cavities and to emerging normal conducting technologies and their applications.  
slides icon Slides TU1A01 [16.553 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TU1A01  
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TUOP04 On the Acceleration of Rare Isotope Beams in the Reaccelerator (ReA3) at the National Superconducting Cyclotron Laboratory at MSU ion, experiment, acceleration, linac 390
 
  • A.C.C. Villari, G. Bollen, M. Ikegami, S.M. Lidia, S. Nash, R. Shane, Q. Zhao
    FRIB, East Lansing, USA
  • D.B. Crisp, A. Lapierre, D.J. Morrissey, R. Rencsok, R.J. Ringle, S. Schwarz, C. Sumithrarachchi, T. Summers
    NSCL, East Lansing, Michigan, USA
  
  The ReAccelerator ReA3 is a worldwide unique, state-of-the-art linear accelerator for rare isotope beams. Beams of rare isotopes are produced and separated in-flight at the NSCL Coupled Cyclotron Facility and subsequently stopped in a linear gas cell. The rare isotopes are then continuously extracted as 1+ ions and transported into a beam cooler and buncher. Ion pulses provided by this device are then transported to a charge breeder based on an Electron Beam Ion Trap (EBIT) where they are captured in flight. The 1+ ions are ionized to a charge state suitable for acceleration in the superconducting radiofrequency (SRF) ReA3 linac, extracted in a pulsed mode and mass analyzed. The extracted beam is pre-bunched before injection into the RFQ and SRF linac, both operating at frequency of 80.5 MHz, and then accelerated to energies from 300 keV/u up to 6 MeV/u, depending on the charge-to-mass ratio of the ion. Stable isotopes can alternatively also be injected into the linac from the EBIT in off-line mode (by ionization of residual gas) or from external off-line ion sources. This contribution will focus on the methodology, properties and techniques used to accelerate and control low intensity rare isotope beams. Results obtained during the preparation of various experiments using the ReA facility, including those with the rare ions 46Ar and 37,46,47K will also be presented.  
slides icon Slides TUOP04 [1.979 MB]  
poster icon Poster TUOP04 [2.602 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUOP04  
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TUOP05 First Experiments at the CW-Operated RFQ for Intense Proton Beams ion, operation, coupling, experiment 394
 
  • P.P. Schneider, D. Born, M. Droba, C. Lorey, O. Meusel, D. Noll, H. Podlech, A. Schempp, B. Thomas, C. Wagner
    IAP, Frankfurt am Main, Germany
  
  This contribution describes the first experiments with the cw-operated RFQ*, which is designed to accelerate protons from 120keV to 700keV for the FRANZ-Project**. The commissioning is done using the RF and ion beam scrubbing technique. In the first phase, the acceptance of the RFQ is scanned and the performance of the RFQ without space-charge effects is evaluated with a 2mA proton beam. The second phase will increase the beam current up to 50mA and a third phase with a machine upgrade for a beam current of up to 200mA is planned. The configuration of a high-current RFQ***, transporting beam current increasing from 2mA with no space-charge forces to a beam with high space-charge effects gives an unique insight in the beam optics of the space-charge effects. The measurements are done with a slit-grid emittance scanner for the transversal phase-space, a faraday cup for the transmitted current and a momentum spectrometer to measure the energy spread. The results set the basis for later experiments on variations of the beam current and the future coupling of the RFQ with an IH-structure****.
* Bechtold, A., et al., MOP001, LINAC08
** Meusel, O., et al., MO3A03, LINAC12
*** Vossberg, M., et al., WEPFI009, IPAC13
**** Heilmann, M., et al., THPWO017, IPAC13 		 
slides icon Slides TUOP05 [2.435 MB]  
poster icon Poster TUOP05 [4.550 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUOP05  
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TUPRC005 Source and LEBT Beam Preparation for IFMIF-EVEDA RFQ emittance, solenoid, simulation, injection 420
 
  • L. Bellan, M. Comunian, E. Fagotti, F. Grespan, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • P.-Y. Beauvais, B. Bolzon, N. Chauvin
    CEA/DSM/IRFU, France
  • L. Bellan
    Univ. degli Studi di Padova, Padova, Italy
  • P. Cara
    Fusion for Energy, Garching, Germany
  • H. Dzitko
    F4E, Germany
  • R. Gobin, F. Senée
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  • R. Ichimiya, A. Kasugai, M. Sugimoto
    JAEA, Aomori, Japan
  • A. Marqueta, F. Scantamburlo
    IFMIF/EVEDA, Rokkasho, Japan
  
  The commissioning phase of the IFMIF-EVEDA RFQ requires a complete beam characterization with simula-tions and measurements of the beam input from the IFMIF-EVEDA ion source and LEBT, in order to reach the RFQ input beam parameters. In this article, the simula-tions results of the complex source-LEBT with the corre-sponding set of measurements and their impact on the commissioning plan will be reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC005  
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TUPRC007 An RFQ Based Neutron Source for BNCT simulation, operation, cavity, neutron 427
 
  • X.W. Zhu, Z.Y. Guo, Y.R. Lu, H. Wang, Z. Wang, K. Zhu, B.Y. Zou
    PKU, Beijing, People's Republic of China
  
  Boron Neutron Capture Therapy (BNCT), promises a bright prospect for future cancer treatment, in terms of effectiveness, safety and less expanse. The PKU RFQ group proposes an RFQ based neutron source for BNCT. A unique beam dynamics design of 162.5 MHz BNCT-RFQ, which accelerates 20 mA of H+ from 30 keV to 2.5 MeV in CW operation, has been performed in this study. The Proton current will be about 20 mA. The source will deliver a neutron yield of 1.76×1013 n/sec/cm2 in the Li(p, n)Be reaction. Detailed 3D electromagnetic (EM) simulations of all components, including cross-section, tuners, pi-rods, and undercuts, of the resonant structure are performed. The design of a coaxial type coupler is developed. Two identical RF couplers will deliver approximately 153 kW CW RF power to the RFQ cavity. RF property optimizations of the RF structures are performed with the utilization of the CST MICROWAVE STUDIO.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPRC007  
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TUPLR050 Design of 4-vane RFQ with Magnetic Coupling Windows for Nuclotron Injector Lu-20 ion, Windows, coupling, linac 575
 
  • V.A. Koshelev, G. Kropachev, T. Kulevoy, D.A. Liakin, A.S. Plastun
    ITEP, Moscow, Russia
  • A.V. Butenko
    JINR, Dubna, Moscow Region, Russia
  • T. Kulevoy, S.M. Polozov
    MEPhI, Moscow, Russia
  • S.V. Vinogradov
    MIPT, Dolgoprudniy, Moscow Region, Russia
  
  Alvarez-type linac LU-20 is used as Nuclotron injector. In the framework of NICA project the high voltage electrostatic pre-injector for LU-20 has been replaced by RFQ linac. The RFQ was designed by the team of ITEP and MEPhI (Moscow, Russia) and was manufactured in VNIITF (Sneginsk, Russia). The engineering design of the 4-vane RFQ linac with magnetic coupling windows and details of its manufacturing are presented and discussed.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR050  
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TUPLR053 Development and Measurements of a 325 MHz RFQ linac, proton, operation, antiproton 578
 
  • M. Schütt, M.A. Obermayer, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • A. Schnase
    GSI, Darmstadt, Germany
  
  In order to have an inexpensive alternative to 4-Vane RFQs above 200 MHz, we study the possibilities of a Ladder-RFQ. The 325 MHz RFQ is designed to accelerate protons from 95 keV to 3.0 MeV according to the design parameters of the research program with cooled antiprotons at FAIR. This particular high frequency for an RFQ creates difficulties, which are challenging in developing a cavity, especially for 4-ROD RFQs, which dimensions become critically small with increasing the frequency. In order to define a satisfying geometrical configuration for this resonator, both from the RF and the mechanical point of view, different designs have been examined and compared. Very promising results were reached with a ladder type RFQ, which has been investigated since 2013. Due to its geometry, the manufacturing in terms of complexity, time and costs is more beneficial compared to welded accelerators. Furthermore, maintenance is easy to handle. The manufacturing, coppering and assembling of a 0.8 m prototype RFQ is finished. We present recent measurements of the RF-field including power measurements, frequency-tuning, field flatness as well as power measurements.  
poster icon Poster TUPLR053 [47.463 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR053  
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TUPLR054 RFQ Vane Shapes for Efficient Acceleration acceleration, multipole, quadrupole, focusing 581
 
  • Y. Iwashita, Y. Fuwa
    Kyoto ICR, Uji, Kyoto, Japan
  • R.A. Jameson
    IAP, Frankfurt am Main, Germany
  
  RFQ vane shapes for efficient acceleration are under investigation by introducing more terms in addition to the two term potential. They can incorporate with the feature of the trapezoidal shape modulation with less multipole components, while higher acceleration efficiency is expected. The simulation study will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR054  
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TUPLR056 Results of Operation of 162.5 MHz RFQ Couplers operation, cavity, vacuum, multipactoring 584
 
  • S. Kazakov, J.P. Edelen, T.N. Khabiboulline, O.V. Pronitchev, J. Steimel
    Fermilab, Batavia, Illinois, USA
  
  Two couplers for RFQ of PXEI facility were designed and manufactured. Each coupler designed to deliver 50 KW, CW to RFQ at 162.5 MHz. Results of couplers operation are reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR056  
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TUPLR057 Advanced Design Optimizations of a Prototype for a Newly Revised 4-Rod CW RFQ for the HLI at GSI dipole, resonance, simulation, impedance 586
 
  • D. Koser, H. Podlech
    IAP, Frankfurt am Main, Germany
  • P. Gerhard, L. Groening
    GSI, Darmstadt, Germany
  • O.K. Kester
    TRIUMF, Vancouver, Canada
  
  Within the scope of the FAIR project (Facility for Antiproton and Ion Research) at GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, Germany, the front end of the existing High Charge State Injector (HLI) is upgraded for cw operation. The dedicated new 4-Rod RFQ structure is currently being designed at the Institute for Applied Physics (IAP) of the Goethe University of Frankfurt. The overall design is based on the RFQ structures that were originally developed for FRANZ* and MYRRHA**. Regarding the HLI-RFQ the comparatively low operating frequency of 108 MHz causes a general susceptibility towards mechanical vibrations especially concerning the electrodes because of the necessarily larger distance between the stems. Besides RF simulations and basic thermal simulations with CST Studio Suite, the key issues like mechanical electrode oscillations as well as temperature distribution from heat loss in cw operation are investigated with simulations using ANSYS Workbench. At first instance a dedicated 6-stem prototype is currently being manufactured in order to validate the simulated RF performance, thermal behavior and structural mechanical characteristics.
*M. Heilmann et al., A Coupled RFQ-IH Cavity for the Neutron Source FRANZ, IPAC13
**C. Zhang, H. Podlech, New Reference Design of the European ADS RFQ Accelerator For MYRRHA, IPAC14
 		 
poster icon Poster TUPLR057 [1.484 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR057  
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TUPLR058 Progress of a 162.5 MHz High-Current RFQ With Coupling Windows Windows, cavity, coupling, simulation 589
 
  • Q. Fu, P.P. Gan, S.L. Gao, F.J. Jia, H.P. Li, Y.R. Lu, Z. Wang, K. Zhu
    PKU, Beijing, People's Republic of China
  
  Funding: Supported by National Basic Research Program of China(2014CB845503)
A 162.5 MHz, four-vane RFQ with magnetic coupling windows has been designed by the RFQ group of Peking University. Clear frequency separation of the resonant modes and smaller transverse dimension are the advantages of the window-type RFQ. The electromagnetic simulations have shown that the average power loss of this 1.809 m long RFQ is about 50 kW in continuous wave mode. Consequently, a water cooling system was designed via the multi-physics analysis. The mechanical design and assembling technology were also presented in this paper. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR058  
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TUPLR059 Asymmetric Four-Vane RFQ dipole, quadrupole, impedance, simulation 592
 
  • A.S. Plastun
    ANL, Argonne, Illinois, USA
  • A. Kolomiets, D.A. Liakin
    ITEP, Moscow, Russia
  
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357.
A four-vane resonator is widely used in Radio Frequency Quadrupole (RFQ) accelerators. The field distribution in a long four-vane resonator can be easily perturbed by nearest dipole modes which are excited due to the local geometry errors. This paper describes the electromagnetic properties of a four-vane resonator with an introduced asymmetry between neighboring chambers. The asymmetry provides necessary separation of dipole modes keeping losses and field uniformity of quadrupole mode similar to those in a conventional four-vane resonator. This feature of an asymmetric resonator is confirmed by analytical results from transmission line model as well as by CST Studio simulations. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR059  
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TUPLR060 RF Design of the Nuclotron-NICA 145.2 MHz RFQ Windows, coupling, dipole, simulation 595
 
  • A.S. Plastun, V. Andreev, V.A. Koshelev, T. Kulevoy, V.G. Kuzmichev, D.A. Liakin, A. Sitnikov
    ITEP, Moscow, Russia
  • A.V. Butenko
    JINR, Dubna, Moscow Region, Russia
  
  ITEP has designed the Radio-Frequency Quadrupole (RFQ) linac for the JINR NICA Complex (Dubna, Russia) to provide ion beams (q/A ≥ 0.3) with energy of 156 keV/u for further acceleration by existing Alvarez-type linac. The RFQ is based on a 4-vane structure with magnetic coupling windows in order to avoid a risk of excitation of dipole field components inherent in a conventional 4-vane resonator. The paper presents results of the radio-frequency (RF) design and capabilities used for coarse and fine tuning of the field distribution and resonant frequency during manufacturing and finalizing of the RFQ.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR060  
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TUPLR063 IMPACT Model for ReA and its Benchmark with DYNAC simulation, ion, cavity, lattice 601
 
  • T. Yoshimoto, M. Ikegami
    FRIB, East Lansing, USA
  
  Funding: * Work supported by the U.S. National Science Foundation under Grant No. PHY-11-02511 ** Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
Abstract New online model for ReAccelerator 3 (ReA3) has been developed for actual beam tunings using IMPACT, which is one of famous particle tracking codes in accelerator field. DYNAC model was used for ReA3 optics calculation. However it basically can calculate symmetric cavity, not axisymmetric ones such as super-conductive Quarter-Wave Resonators (QWRs), which are installed in ReA3. This means that it is difficult to effectively tune beams at present situation. In order to handle beams at ReA3, a new alternative and more precise model of IMPACT is under development, which would be acceptable to actual beam operation. This paper reports benchmarked results of IMPACT and DYNAC model for ReA3 acceleration line just after RFQ exit to a transport line with symmetric cavity as a first step before more precise simulation including non-axisymmetric cavity and RFQ calculation. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TUPLR063  
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WE1A01 PIP-II Injector Test: Challenges and Status cryomodule, operation, solenoid, SRF 641
 
  • P. Derwent, J.-P. Carneiro, J.P. Edelen, V.A. Lebedev, L.R. Prost, A. Saini, A.V. Shemyakin, J. Steimel
    Fermilab, Batavia, Illinois, USA
  
  The Proton Improvement Plan II (PIP-II) at Fermilab is a program of upgrades to the injection complex. At its core is the design and construction of a CW-compatible, pulsed H− superconducting RF linac. To validate the concept of the front-end of such machine, a test accelerator known as PXIE is under construction. It includes a 10 mA DC, 30 keV H− ion source, a 2 m-long Low Energy Beam Transport (LEBT), a 2.1 MeV CW RFQ, followed by a Medium Energy Beam Transport (MEBT) that feeds the first of 2 cryomodules increasing the beam energy to about 25 MeV, and a High Energy Beam Transport section (HEBT) that takes the beam to a dump. The ion source, LEBT, RFQ, and initial version of the MEBT have been built, installed, and commissioned. This report presents the overall status of the PXIE warm front end, including results of the beam commissioning through the installed components, and progress with SRF cryomodules and other systems.  
slides icon Slides WE1A01 [9.457 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-WE1A01  
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WE1A06 Status of SPIRAL2 and RFQ Beam Commissioning linac, ion, proton, ion-source 668
 
  • R. Ferdinand, P. Bertrand, M. Di Giacomo, H. Franberg, O. Kamalou, J.-M. Lagniel, G. Normand, A. Savalle, F. Varenne
    GANIL, Caen, France
  • J.-L. Biarrotte
    IPN, Orsay, France
  • D. Uriot
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  
  The SPIRAL2 project beam commissioning is started and the superconducting linac installation is being finalized. In parallel with the installations, the first proton beam was extracted in 2014 and the expected beam performances were achieved from both light and heavy ion sources. The conditioning of the RFQ started in October 2015, and the beam commissioning soon after that. After having briefly recalled the project scope and parameters, the present situation of the RFQ beam commissioning is presented.  
slides icon Slides WE1A06 [19.488 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-WE1A06  
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TH1A04 SARAF 4-Rods RFQ RF Power Line Splitting Design and Test operation, proton, coupling, vacuum 693
 
  • J. Rodnizki, D. Hirschmann, Z. Horvitz, B. Kaizer, A. Perry, L. Weissman
    Soreq NRC, Yavne, Israel
  
  In the last years the SARAF 176 MHz 3.8 m long 4-rod RFQ accelerates routinely 2-4 mA CW proton beams to 1.5 MeV for basic studies in physics. However, it has not been successful in running CW deuteron beam for long periods. The findings imply that the RF coupler is the bottle neck to reach 250 kW CW dissipated power, equivalent to 65 kV inter-rod voltage, required to run the CW deuteron beam. A new design that splits the RFQ power between two couplers was built and commissioned successfully. A 3dB splitter and two new RF couplers were installed. The RF couplers improved design allows better brazing methods, vacuum properties and RF sealing. This design is innovative from two points of view: (a) implementation of two synchronized couplers located in two separated RF cells in a 4-rod RFQ. (b) The ability to run the RFQ in 200-250 kW to accelerate a 5 mA CW deuteron beam by 2.6 MV required for the new modulation design for 1.3 MeV/u. To our knowledge, SARAF RFQ will be the first 4-rod RFQ capable of running a CW deuteron beam at these power densities. This work may contribute to other 4-rod RFQ projects which intend to run CW beams in high dissipation power, like FRANZ and MYRRHA.  
slides icon Slides TH1A04 [6.109 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A04  
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TH1A05 Towards Commissioning of the IFMIF RFQ linac, vacuum, controls, impedance 698
 
  • A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  
  All 18 sections of the IFMIF RFQ were completed in summer 2015. A 2 m section (the last three modules and one prototype used as RF termination) were RF tested at LNL at the design value of 90 kW/m in cw conditions. The three 3.3 m long supermodules were sent to Japan in January 2016. The RFQ was installed and tuned with fixed tuners to the nominal field frequency and field distribution. The very high design shunt impedance was achieved.  
slides icon Slides TH1A05 [23.395 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A05  
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TH1A06 High-Frequency Compact RFQs for Medical and Industrial Applications proton, linac, ion, dipole 704
 
  • M. Vretenar, V.A. Dimov, M. Garlaschè, A. Grudiev, B. Koubek, A.M. Lombardi, S.J. Mathot, D. Mazur, E. Montesinos, M.A. Timmins
    CERN, Geneva, Switzerland
  
  CERN has completed the construction of a 750 MHz RFQ reaching 5 MeV proton energy in a length of only 2 meters, to be used as injector for a compact proton therapy linac. Beyond proton therapy, this compact and lightweight design can be used for several applications, ranging from the production of radioisotopes in hospitals to ion beam analysis of industrial components or of artworks. The ex-perience with the construction of the first unit will be pre-sented together with the design and plans for other appli-cations.  
slides icon Slides TH1A06 [9.369 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-TH1A06  
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THOP08 Beam Commissioning of the i-BNCT Linac linac, target, ion, ion-source 760
 
  • F. Naito, S. Anami, Z. Fang, K. Futatsukawa, Y. Honda, Y. Hori, M. Kawamura, H. Kobayashi, T. Kurihara, T. Miura, T. Miura, T. Miyajima, T. Obina, F. Qiu, Y. Sato, T. Shibata, M. Shimamoto, A. Takagi, E. Takasaki, M. Uota
    KEK, Ibaraki, Japan
  • S. Fujikura
    ICEPP, Tokyo, Japan
  • K. Ikegami
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  • H. Kumada, Su. Tanaka
    Tsukuba University, Graduate School of Comprehensive Human Sciences, Ibaraki, Japan
  • Y. Liu, T. Maruta
    KEK/JAEA, Ibaraki-Ken, Japan
  • A. Miura
    JAEA/J-PARC, Tokai-mura, Japan
  • N. Nagura, T. Ohba
    Nippon Advanced Technology Co., Ltd., Tokai, Japan
  • T. Onishi
    Tsukuba University, Ibaraki, Japan
  • T. Ouchi
    ATOX, Ibaraki, Japan
  
  The beam commissioning of the linac for the boron neutron capture therapy of Ibaraki prefecture (i-BNCT) has been started. The accelerator of i-BNCT consists of the 3-MeV RFQ and 8-MeV DTL. The design of RF structure of them is based on the J-PARC linac. After the first demonstration of neutron production on December 2015, significant modifications to the linac were given in order to increase the operation stability and the beam power. The progress of the beam commissioning of the i-BNCT will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP08  
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THOP09 Tuning of the CERN 750 MHz RFQ for Medical Applications linac, quadrupole, operation, target 763
 
  • B. Koubek, Y. Cuvet, A. Grudiev, C. Rossi, M.A. Timmins
    CERN, Geneva, Switzerland
  
  CERN has built a compact 750 MHz RFQ as an injector for a hadron therapy linac. This RFQ was designed to accelerate protons to an energy of 5 MeV within only 2 m length. It is divided into four segments and equipped with 32 tuners in total. The RFQ length corresponds to 5λ which is considered to be close to the limit for simple field adjustment using tuners. Nevertheless the high frequency results in a sensitive structure and requires careful tuning by means of the alignment of the pumping ports and fixed tuners. This paper gives an overview of the tuning procedure and bead pull measurements of the RFQ.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THOP09  
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THPRC029 Comissioning Results for a Subharmonic Buncher at REA linac, bunching, detector, timing 833
 
  • D.M. Alt, J.F. Brandon, S.W. Krause, A. Lapierre, D.G. Morris, S. Nash, N.R. Usher, A.C.C. Villari, S.J. Williams, S. Zhao
    FRIB, East Lansing, USA
  • M.J. Syphers
    Northern Illinois University, DeKalb, Illinois, USA
  
  Funding: NSF PHY-1102511
The reaccelerator facility (ReA) at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU) offers a unique capability to study reactions with low-energy beams of rare isotopes. A beam from the coupled cyclotron facility is stopped in a gas stopping system, charge bred in an Electron Beam Ion Trap (EBIT), and then reaccelerated in a compact superconducting LINAC. The original beam repetition rate at the ReA targets was the same as the LINAC RF frequency of 80.5 MHz. In order to add the capability to bunch at a lower frequency (desirable for many types of experiments using time of flight data acquisitions) a 16.1 MHz buncher has been designed, constructed, and commissioned. This paper reports the results of the commissioning of the device, and outlines some future avenues for further improvement of the properties of the bunched beam. 		 
poster icon Poster THPRC029 [0.903 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPRC029  
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THPLR024 SPIRAL2 Project: Integration of the Accelerator Processes, Construction of the Buildings and Process Connections linac, controls, ion, neutron 894
 
  • P. Anger, P. Bisson, O. Danna, X. Hulin, J.-M. Lagniel, S. Montaigne, F. Perocheau, E. Petit, L. Roupsard
    GANIL, Caen, France
  
  The GANIL SPIRAL 2 Project is based on the construction of a superconducting ion CW LINAC (up to 5 mA - 40 MeV deuteron and 33 MeV proton beams, up to 1 mA - 14.5 MeV/u heavy ion beams) with two experimental areas named S3 ('Super Separator Spectrometer' for very heavy and super heavy element production) and NFS ('Neutron For Science'), The building studies as well as the accelerator and experimental equipment integration started in 2009. The ground breaking started at the end of 2010. The integration task of the different equipments into the buildings is managed by a trade-oriented integration unit gathering the accelerator integration team, the building prime contractor and a dedicated contracting assistant. All work packages are synthesized at the same time using 3D models. 3D tools are used to carry out integration, synthesis, process connections and the preparation of the future assembly. Since 2014, the buildings and process connections are received and the accelerator installation is well advanced. This contribution will describe these 3D tools, the building construction, the process connection status and our experience feedback.  
poster icon Poster THPLR024 [3.620 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR024  
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THPLR042 Beam Dynamics Studies for a Compact Carbon Ion Linac for Therapy ion, linac, DTL, focusing 946
 
  • A.S. Plastun, B. Mustapha, A. Nassiri, P.N. Ostroumov
    ANL, Argonne, Illinois, USA
  • L. Faillace, S.V. Kutsaev, E.A. Savin
    RadiaBeam, Santa Monica, California, USA
  • E.A. Savin
    MEPhI, Moscow, Russia
  
  Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics, under Accelerator Stewardship Grant, Proposal No. 0000219678
Feasibility of an Advanced Compact Carbon Ion Linac (ACCIL) for hadron therapy is being studied at Argonne National Laboratory in collaboration with RadiaBeam Technologies. The 45-meter long linac is designed to deliver 109 carbon ions per second with variable energy from 45 MeV/u to 450 MeV/u. S-band structure provides the acceleration in this range. The carbon beam energy can be adjusted from pulse to pulse, making 3D tumor scanning straightforward and fast. Front end accelerating structures such as RFQ, DTL and coupled DTL are designed to operate at lower frequencies. The design of the linac was accompanied with extensive end-to-end beam dynamics studies which are presented in this paper. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR042  
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THPLR049 Tuning the IFMIF 5MeV RFQ Accelerator dipole, insertion, target, vacuum 969
 
  • A. Palmieri, F. Grespan, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  
  In order to allow proper operation of the IFMIF RFQ, it is necessary to perform a campaign of RF measurements on the cavity aimed, on one hand, at determining the basic RF parameters (frequency, Q0, etc.), on the other hand at verifying the fulfilment of the voltage law within the specified admitted range (±2% target value, ±4% acceptance value) of any of the perturbative components upon successive tuner settings as predicted by the tuner algorithm. These measurements also involve the determination of the proper depth of the end plates and the positioning and length of the Dipole Stabilizers (if any). In this contribution the tuning procedure and the results of such measurements will be presented for the case of the IFMIF RFQ will be described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR049  
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THPLR050 IFMIF RFQ Module Characterization via Mechanical and RF Measurements cavity, controls, alignment, linac 972
 
  • L. Ferrari, A. Palmieri, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • R. Dima, A. Pepato, A. Prevedello, E. Udup
    INFN- Sez. di Padova, Padova, Italy
  
  The RFQ of the IFMIF/EVEDA project is a 9.9 m long cavity able to accelerate a 130 mA deuteron beam from the input energy of 100 keV to the output energy of 5 MeV. Such RFQ operates at the frequency of 175 MHz and is composed of 18 mechanical modules approximately 0.55 m long each. The RFQ realization involves the I.N.F.N. Sections of Padova, Torino and Bologna, as well as the Legnaro National Laboratories (L.N.L.). The metrological measurements via CMM (Coordinate Measuring Machine) provided to be a very effective tool both for quality controls along the RFQ production phases and in the reconstruction of the cavity geometric profile for each RFQ module. The scans in the most sensitive regions with respect to RF frequency, such as modulation, tips, base-vane width and vessel height provided the values of the cavity deviations from nominal geometry to be compared with design physic-driven tolerances and with RF measurements. Moreover, the comparison between mechanical and RF measurements suggests a methodology for the geometric reconstruction of the cavity axis and determines the final machining of the end surfaces of each module in view of the coupling with the adjacent ones. In this paper a description of the meteorological procedures and tests and of the RFQ along its production and assembly phases will be described.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR050  
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THPLR051 High-Power RF Test of IFMIF-EVEDA RFQ at INFN-LNL cavity, controls, operation, vacuum 975
 
  • E. Fagotti, L. Antoniazzi, M.G. Giacchini, F. Grespan, M. Montis, A. Palmieri
    INFN/LNL, Legnaro (PD), Italy
  
  A partial test at full power and CW duty cycle will be performed at INFN-LNL on the last elements of the IFMIF RFQ, approximately two meters of structure, using a specific electromagnetic boundary element on the low energy end. The aim is to reach, in the RFQ coupled with its power coupler system, after an adequate period of conditioning, cw operation at nominal field level (132 kV between electrodes) for at least two hours without breakdown. The description of the experimental setup and procedure, as well as the main results of the conditioning procedure will be reported in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR051  
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THPLR054 Recent RF and Mechanical Developments for the ESS RFQ cavity, operation, vacuum, simulation 978
 
  • N. Misiara, A. Albéri, G. Bourdelle, A.C. Chauveau, D. Chirpaz-Cerbat, M. Desmons, A.C. France, M. Lacroix, P.-A. Leroy, J. Neyret, G. Perreu, O. Piquet, B. Pottin, H. Przybilski, N. Sellami
    CEA/IRFU, Gif-sur-Yvette, France
  
  The ESS Radio-Frequency Quadrupole (RFQ) is a 4-vane resonant cavity designed at the frequency of 352.21 MHz frequency. It must accelerate and bunch a 70 mA proton beams from 75 keV to 3.62 Mev of energy with a 4% duty cycle. The current 3D design evolved and is currently divided in 5 segments for a total length of 4.54 m. This paper presents a complete radiofrequency (RF) analysis using the ANSYS Multiphysics 3D RF simulating code HFSS and a RFQ 4-wire transmission line model (TLM). It describes the integrated cooling strategy based on a coupling between the RF power losses and the thermo-mechanical physics in order to allow a proper RFQ tuning once under operation.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR054  
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THPLR062 Muon Acceleration Using an RFQ linac, experiment, acceleration, emittance 992
 
  • Y. Kondo, K. Hasegawa
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Fukao, N. Kawamura, T. Mibe, Y. Miyake, M. Otani, K. Shimomura
    KEK, Tsukuba, Japan
  • K. Ishida
    RIKEN Nishina Center, Wako, Japan
  • R. Kitamura
    University of Tokyo, Tokyo, Japan
  • N. Saito
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  
  A muon linac development for a new muon g-2 experiment is now going on at J-PARC. Muons from the muon beam line (H-line) at the J-PARC MLF are once stopped in an silica aerojel target and room temperature muoniums are evaporated from the aerogel. They are dissociated with laser (ultra slow muons), then accelerated up to 212 MeV using a linear accelerator. As the first accelerating structure, an RFQ will be used. We are planning to use a spare RFQ of the J-PARC linac for the first acceleration test. For this acceleration test, an degraded muon beam will be used instead of the ultra slow muon sourece. In this paper, present status of this muon acceleration test using the J-PARC RFQ is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR062  
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THPLR063 RF Design of a Deuteron Beam RFQ cavity, dipole, simulation, operation 996
 
  • C.X. Li, W.P. Dou, Y. He, F.F. Wang, Z.J. Wang, X.B. Xu, Z.L. Zhang
    IMP/CAS, Lanzhou, People's Republic of China
  
  In a material irradiation facility in IMP, a RFQ is required for accelerating deuteron beam from 20 keV/u to 1.52 MeV/u. The structure design of the RFQ is drawing on the experience of the RFQ of Injector II of China ADS LINAC. Four-vane structure is adopted and the operation frequency is 162.5 MHz. Inter vane voltage is 65 kV and the Kilpatrick factor is 1.4. Π-mode stabilizing loops are used to move the dipole modes away from the working mode. Slug tuners are used to compensate for capacitance errors induced by machining. Cutbacks and end plate are modified to reach a reasonable field flatness. After the structure design and optimization, the simulation results of the cavity frequency is 162.459 MHz, the power loss is 109 kW. The multiphysics simulations are also performed to determine the frequency shift caused by the shift of the cooling water temperature.  
poster icon Poster THPLR063 [0.971 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR063  
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THPLR064 Design and Simulation of a High Intensity Heavy Ion RFQ Accelerator Injector dipole, simulation, ion, heavy-ion 999
 
  • W. Ma, Y. He, C.X. Li, L. Lu, L.B. Shi, L.P. Sun, X.B. Xu, Z.L. Zhang, H.W. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  
  An 81.25 MHz continuous wave (CW) radio frequency quadrupole (RFQ) accelerator has been developed for Low Energy Accelerator Facility (LEAF) at the Institute of Modern Physics (IMP), the Chinese Academy of Science (CAS). In the CW operating mode, the proposed RFQ design adopted the conventional four-vane structure. The main design goals are providing the high shunt impendence with low power losses. In the electromagnetic (EM) design, the π-mode stabilizing loops (PISLs) were optimized to produce a good mode separation. The tuners were also designed and optimized to tune frequency and field flatness of the operating mode. The vane undercuts were optimized to provide a flat field along the RFQ cavity. Additionally, a full length model with modulations was set up for the final EM simulations. In this paper, detailed EM design of the LEAF-RFQ will be presented and discussed. Meanwhile, structure error analysis is also studied.  
poster icon Poster THPLR064 [3.021 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR064  
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THPLR065 Beam Commissioning Status and Results of the FNAL PIP2IT Linear Accelerator RFQ experiment, proton, controls, operation 1002
 
  • J. Steimel, C.M. Baffes, P. Berrutti, J.-P. Carneiro, J.P. Edelen, T.N. Khabiboulline, L.R. Prost, V.E. Scarpine, A.V. Shemyakin
    Fermilab, Batavia, Illinois, USA
  • A.L. Edelen
    CSU, Fort Collins, Colorado, USA
  • M.D. Hoff, A.R. Lambert, D. Li, T.H. Luo, J.W. Staples, S.P. Virostek
    LBNL, Berkeley, California, USA
  • V.L. Sista
    BARC, Mumbai, India
  
  Funding: Operated by Fermi Research Alliance, LLC under Contract No. De-AC02-07CH11359 with the United States Department of Energy.
An H− beam was accelerated through a continuous wave (CW) capable, 4-vane, radio frequency quadrupole (RFQ) at Fermilab that was designed and constructed at Berkeley Lab. This RFQ is designed to accelerate up to 10 mA H− beam from 30 keV to 2.1 MeV in a test accelerator (PIP2IT). This paper presents results of specification verification and commissioning. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR065  
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THPLR066 Preparation and Installation of IFMIF-EVEDA RFQ at Rokkasho Site alignment, cavity, coupling, vacuum 1005
 
  • E. Fagotti, L. Antoniazzi, A. Baldo, A. Battistello, P. Bottin, L. Ferrari, M.G. Giacchini, F. Grespan, M. Montis, A. Pisent, D. Scarpa
    INFN/LNL, Legnaro (PD), Italy
  • D. Agguiaro, A.G. Colombo, A. Pepato, L. Ramina
    INFN- Sez. di Padova, Padova, Italy
  • F. Borotto Dalla Vecchia, G. Dughera, G. Giraudo, E.A. Macri, P. Mereu, R. Panero
    INFN-Torino, Torino, Italy
  
  The IFMIF-EVEDA RFQ is composed of 18 modules for a total length of 9.8 m and is designed to accelerate the 125 mA D+ beam up to 5 MeV at the frequency of 175 MHz. The RFQ is subdivided into three Super-Modules of six modules each. The Super-Modules were pre-assembled, aligned and vacuum tested at INFN-LNL and then shipped to Rokkasho (Japan). At Rokkasho site a series of test were performed in order to verify the effect of the shipment on the cavity. The assembly debug, shipment equipment and the sequence of operations are described in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-THPLR066  
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FR1A02 Installation and On-Line Commissioning of EBIS at ATLAS ion, electron, emittance, beam-transport 1022
 
  • P.N. Ostroumov, A. Barcikowski, J.A. Clark, C. Dickerson, M.R. Hendricks, Y. Luo, R.C. Pardo, C.E. Peters, M.A. Power, G. Savard, S.I. Sharamentov, R.C. Vondrasek, G.P. Zinkann
    ANL, Argonne, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of Nuclear Physics, under Contract DE-AC02-06CH11357.
An Electron Beam Ion Source Charge Breeder (EBIS-CB) has been developed at Argonne to breed radioactive beams from the CAlifornium Rare Ion Breeder Upgrade (CARIBU) facility at ATLAS. The CARIBU EBIS-CB has been successfully commissioned offline with an external singly-charged cesium ion source. The EBIS performance meets the breeding requirements to deliver CARIBU beams to ATLAS. EBIS can provide charge-to-mass ratios >=1/7 for all CARIBU beams with breeding times in the range of 6 ms to 30 ms. A record high breeding efficiency of up to 28% into a single charge state of Cs28+ has been demonstrated. Following the offline testing EBIS was moved to the front end of ATLAS where the alignment of EBIS was substantially improved and additional beam diagnostic tools both for electron and ion beams were installed. This paper will discuss EBIS improvements and present the results of on-line commissioning. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-FR1A02  
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FR1A05 Development of a Muon Linac for the G-2/EDM Experiment at J-PARC acceleration, linac, emittance, cavity 1037
 
  • M. Otani, N. Kawamura, T. Mibe, F. Naito, M. Yoshida
    KEK, Tsukuba, Japan
  • K. Hasegawa, Y. Kondo
    JAEA, Ibaraki-ken, Japan
  • N. Hayashizaki
    RLNR, Tokyo, Japan
  • T. Ito
    JAEA/J-PARC, Tokai-mura, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • Y. Iwata
    NIRS, Chiba-shi, Japan
  • R. Kitamura
    University of Tokyo, Tokyo, Japan
  • N. Saito
    J-PARC, KEK & JAEA, Ibaraki-ken, Japan
  
  Precision measurements of the muon's anomalous magnetic moment (g-2) and electric dipole moment (EDM) are one of the effective ways to test the standard model. An ultra-cold muon beam is generated from a surface muon beam by a thermal muonium production and accelerated to 300 MeV/c by a linac. The muon linac consists of an RFQ, an inter-digital IH, a Disk And Washer structure, and a disk loaded structure. The ultra-cold muons will have an extremely small momentum spread of 0.3 % with a normalized transverse emittance of around 1.5 pi mm-mrad. The design and status of the muon linac at J-PARC will be presented.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2016-FR1A05  
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