Keyword: rfq
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MOAB2 Overview of Beam Instrumentation for the CADS Injector I Proton Linac linac, emittance, diagnostics, proton 21
 
  • Y.F. Sui, J.S. Cao, Q.Y. Deng, J. He, H.Z. Ma, L. Wang, Q. Ye, L. Yu, J.H. Yue, X.Y. Zhao, Y. Zhao
    IHEP, People's Republic of China
  
  The driver linac of the China Accelerator Driven Subcritical system (C-ADS), which is composed of an ECR ion source, a low energy beam transport line (LEBT), a radio frequency quadrupole accelerator (RFQ), a medium energy beam transport line (MEBT) and cryomodules with SRF cavities to boost the energy up to 10 MeV. The injector linac will be equipped with beam diagnostics to measure the beam position, the transverse profile and emittance, the beam phase as well as beam current and beam losses. Though many are conventional design, They can provide efficient operation of drive linac. This paper gives an overview of C-ADS linac beam instrumentation.  
slides icon Slides MOAB2 [2.755 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOAB2  
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MOPWA007 The SARAF-LINAC Beam Dynamics linac, emittance, proton, simulation 89
 
  • N. Pichoff, D. Uriot
    CEA/DSM/IRFU, France
  • B. Dalena
    CEA/IRFU, Gif-sur-Yvette, France
  
  SNRC and CEA collaborate to the upgrade of the SARAF Accelerator to 5 mA CW 40 MeV deuteron and proton beams (Phase 2). This paper presents the beam dynamics in the reference design of the SARAF-LINAC (from the 4 m long 176 MHz RFQ to the HWR Superconducting linac’s end). The beam losses, mostly in longitudinal direction, estimated from error studies, are compared with acceptable losses defined for hands-on maintenance.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA007  
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MOPWA047 Start to End Simulation of High Current Injector using TRACEWIN Code ion, DTL, optics, linac 223
 
  • S. Kumar, A. Mandal
    IUAC, New Delhi, India
  
  High Current Injector (HCI) is an alternate injector to superconducting linac at IUAC in addition to pelletron. It consists mainly of high temperature superconducting ECR ion source (PKDELIS), radio frequency quadrupole (RFQ)* and a drift tube linac (DTL)**. The ions of mass to charge (A/q) ratio of 6 are analysed initially and accelerated through RFQ and DTL to a total energy of 1.8 MeV/u. The different energy regimes connecting the accelerating stages are named as low, medium and high energy beam transport section (LEBT, MEBT and HEBT). The energy spread of beam increases from 0.02% at ECR source to 0.5% at the DTL exit. An ion beam of normalized transverse and longitudinal emittance of 0.03 pi mm-mrad and 0.3 keV/u-ns has been considered at the start for the simulation of ion optics using TRACEWIN*** code. The whole beam transport system has been designed using GICOSY, TRANSPORT and TRACE 3D codes piecewise and TRACEWIN code is used to simulate whole ion optics from start to end including acceleration stages such as RFQ and DTL. Simulation results shows that beam can be injected through LEBT, MEBT and HEBT into LINAC without significant emittance growth and beam loss.
* Sugam Kumar et al., Proc. of InPAC-2011, IUAC, New Delhi
** B.P. Ajith Kumar et al., Proc. of InPAC-2009, RRCAT, Indore
*** http://irfu.cea.fr/Sacm/logiciels/index3.php 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA047  
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MOPWA057 Space Charge Simulation and Matching at Low Energy Section of J-PARC Linac space-charge, emittance, simulation, solenoid 251
 
  • S. Artikova, T. Morishita
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • Y. Kondo
    JAEA, Ibaraki-ken, Japan
  
  An intensity upgrade of Japan Proton Accelerator Research Complex (J-PARC) included the installation of a new ion source (IS) and a radio-frequency quadrupole (RFQ) which to be used at first stage of acceleration. The linac is divided into two sections on the basis of operating frequencies and three sections on the basis of family of RF cavities to be used for the acceleration of 50 mA beam of H− ions from 50 keV to 400 MeV. Low energy part of linac consists of an IS, a two-solenoid low energy beam transport (LEBT) and the RFQ. The transition from one section to another can limit the acceptance of the linac if these are not matched properly in both longitudinal and transverse plane. We performed a study to calculate the acceptance of the RFQ at zero current in which space charge effects are not considered. In addition, a particle tracking technique is employed to study the space charge effects in LEBT of the J-PARC linac after the intensity upgrade in order to match the beam to the RFQ. Also, RFQ tank level and intervene voltage calibration factor is determined by comparing the simulation results of the beam transmission with the test measurement of tank level vs. transmission.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA057  
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MOPWA061 ADS Injector I Frequency Choice at IHEP linac, emittance, space-charge, proton 265
 
  • F. Yan, H. Geng, C. Meng, H.F. Ouyang, S. Pei, Y.L. Zhao
    IHEP, Beijing, People's Republic of China
  
  Funding: Chinese Academy of Science (CAS) strategic Priority Research Program-Future Advanced Nuclear Fission Energy (Accelerator-Driven Sub-critical System)
The China ADS driver linac is composed of two major parts: the injector and the main linac. There are two frequency choices for the injector: 325 MHz and 162.5 MHz. The former choice is benefit for the same frequency with the front end of the main linac. For half frequency choice, to obtain the same longitudinal acceptance of the main linac comparing with 325MHz injector, the tune depression of the beam reaches the lower design limit of 0.5, no current upgrade opportunity is reserved; contrarily to get the same space charge effect, 16 more cavities would be the cost to get the same acceptance. However the disadvantage of the 325MHz injector choice is the bigger power density of the copper structure CW RFQ and the smaller longitudinal acceptance of the SC section. The details of the comparing for the two frequency choices are introduced and presented.
*Work supported by Chinese Academy of Science (CAS) strategic Priority Research Program-Future Advanced Nuclear Fission Energy (Accelerator-Driven Sub-critical System)
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPWA061  
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MOPJE017 Error Analysis and Correction at the Main LEBT of RAON Heavy Ion Accelerator ion, GUI, heavy-ion, simulation 314
 
  • H. Jin, I.S. Hong, H. Jang, J.-H. Jang
    IBS, Daejeon, Republic of Korea
  
  The main Low Energy Beam Transport (LEBT) section of Rare isotope Accelerator Of Newness (RAON) heavy ion accelerator is designed to transport the ion beams which are generated by Electron Cyclotron Resonance Ion Source (ECR-IS) to the Radio Frequency Quadrupole (RFQ). In the main LEBT, one or two beams are selected among a variety of ion beams to meet the beamline experiment requirements such as beam charge and current. In a uranium beam case, two charge-state, 33+ and 34+, beams are chosen and transported to the RFQ. For transportation of two charge-state beams, beams can be seriously affected by dipole kick or unexpected dispersion caused by magnet errors. These effects of magnet or cavity errors lead to beam loss at the main LEBT or RFQ. Therefore, the effect to the beam orbit and size should be identified and the research for reducing such effect should be required in the main LEBT. In this paper, we will examine the orbit distortion and beam size growth caused by magnet errors and discuss the correction of errors by using correctors and BPMs.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPJE017  
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MOPTY025 High-current RFQ Design Study on RAON emittance, cavity, ion, acceleration 990
 
  • J. Bahng, E.-S. Kim
    Kyungpook National University, Daegu, Republic of Korea
  • B.H. Choi
    IBS, Daejeon, Republic of Korea
  
  Rare isotope Accelerator Of Newness (RAON) heavy ion accelerator has been designed as a facility for a rare isotepe accelerator of the Rare Isotope Science Project (RISP). RAON provides 400 kW CW heavy ion beams from proton to uranium to support researches in various science fields. The RAON system consists of a few ECR ion source, low energy beam transport systems (LEBTs), CW radio frequency quadrupole (RFQ) accelerators, a medium energy beam transport and superconducting linac. We present the design study of the RFQ accelerator from 30 keV/u to 1.5 MeV/u of deuteron beam with meeting a requirement of over 15 mA beam at the target. We optimized the normal conducting CW RFQ accelerator that has a high transmission and a low longitudinal emittance. In this paper, we will present the design result of RFQ beam dynamics studies and its 2D and 3D EM analysis.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-MOPTY025  
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TUXB1 FRANZ and Small-Scale Accelerator-Driven Neutron Sources neutron, proton, target, operation 1276
 
  • C. Wiesner, S.M. Alzubaidi, M. Droba, M. Heilmann, O. Hinrichs, B. Klump, O. Meusel, D. Noll, O. Payir, H. Podlech, U. Ratzinger, A. Schempp, S. Schmidt, P.P. Schneider, M. Schwarz, W. Schweizer, K. Volk, C. Wagner
    IAP, Frankfurt am Main, Germany
  • R. Reifarth
    IKF, Frankfurt-am-Main, Germany
  
  This paper gives an overview of the opportunities and challenges of high-intensity, low-energy light-ion accelerators for neutron production. Applications of this technology range from the study of stellar nucleosynthesis and astrophysical phenomena to medical applications such as Boron neutron capture therapy (BNCT). The paper includes details of the FRANZ facility, under development at Frankfurt University.  
slides icon Slides TUXB1 [3.514 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUXB1  
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TUPWI026 A Monochromatic Gamma Source without Neutrons neutron, photon, proton, DTL 2292
 
  • R.W. Garnett, S.S. Kurennoy, L. Rybarcyk, T.N. Taddeucci
    LANL, Los Alamos, New Mexico, USA
  
  Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396.
High-energy gamma rays can be efficiently produced using the direct excitation of the 15.1-MeV level in 12C via the (p, p’) reaction. This reaction has the threshold energy of 16.38 MeV. The threshold for neutron production via 12C (p, n) is 19.66 MeV, so there is an energy window of 3.28 MeV where the 15.1-MeV photons can be produced without any direct neutrons. Thick-target yield estimates indicate that just below the neutron production threshold, the photon output is about twice that of the more well-known 11B (d, n) reaction requiring 4-MeV deuterons, with the expected 15.1-MeV photon flux to be approximately 1011 s-1 sr-1 per 1 mA of 19.6-MeV proton current on a carbon target. A compact pulsed proton accelerator capable of 10-mA or greater peak currents to drive such a gamma source will be presented. The accelerator concept is based on a 4-rod RFQ followed by compact H-mode structures with PMQ focusing. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-TUPWI026  
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WEYB2 Beam Dynamics in a High Frequency RFQ alignment, emittance, proton, linac 2408
 
  • A.M. Lombardi, V.A. Dimov, M. Garlaschè, A. Grudiev, S.J. Mathot, E. Montesinos, S. Myers, M.A. Timmins, M. Vretenar
    CERN, Geneva, Switzerland
  
  CERN is constructing a 750 MHz Radio Frequency Quadrupole (RFQ) which can accelerate a proton beam to 5 MeV in a length of 2 m. The beam dynamics strategic parameters have been chosen to make this RFQ a good candidate for the injector of a medical facility operating at frequency of 3 GHz. Minimising beam losses above 1 MeV, containing the RF power losses and opening the road to industrialisation have been the guidelines for an unconventional RFQ design. In this paper, the optimisation efforts, the structure design and the expected beam qualities will be detailed. The status of the construction as well as the potential for further developments will be presented.  
slides icon Slides WEYB2 [2.166 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEYB2  
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WEPWA018 Re-acceleration of Ultra Cold Muon in J-PARC MLF acceleration, linac, proton, experiment 2532
 
  • M. Yoshida, F. Naito
    KEK, Ibaraki, Japan
  • S. Artikova, Y. Kondo
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • N. Hayashizaki
    RLNR, Tokyo, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • K. Torikai
    Gunma University, Heavy-Ion Medical Research Center, Maebashi-Gunma, Japan
  
  Funding: MEXT KAKENHI Grant Number 6108718
The ultra cold muon beam by two-photon laser resonant ionization of muonium atoms is unique way to obtain very low emittance muon beam. Its muon source is a surface muon from the muon target in MLF where one percent proton beam from J-PARC RCS is reacted. In close collaboration with the Muon Science Es- tablishment (MUSE) at Material and Life science experi- mental Facility (MLF) of the Japan Proton Accelerator Re- search Complex (J-PARC), we are developing the reacceleration system of the ultra cold muon beam. Its optimum accelerating structure is similar to a proton accelerator in low beta part and an electron accelerator in high beta part. Further the muon bunch is only two bunch corresponding to the bunch structure of the J-PARC RCS. Thus we are testing the dielectric transmission line accelerator based on the photoconductive switch as the altenative acceleration method. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA018  
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WEPWA023 Development of Muon LINAC for the Muon g-2/EDM Experiment at J-PARC acceleration, target, cavity, experiment 2541
 
  • M. Otani, Y. Fukao, T. Mibe, N. Saito, M. Yoshida
    KEK, Tsukuba, Japan
  • Y. Iwashita
    Kyoto ICR, Uji, Kyoto, Japan
  • R. Kitamura
    University of Tokyo, Tokyo, Japan
  • Y. Kondo
    JAEA, Ibaraki-ken, Japan
  
  The muon anomalous magnetic moment (g-2) and electric dipole moment (EDM) are one of the effective paths to beyond Standard Model of elementary particle physics. The E34 experiment aims to measure g-2 with a precision of 0.1 ppm and search EDM with a sensitivity to 10-21 e*cm with high intensity proton driver at J-PARC and a newly developed novel technique of the ultra-cold muon beam. The ultra-cold muons, which are generated from surface muons by the thermal muonium production and laser ionization, are accelerated to 300 MeV/c by muon linear accelerator. The muon LINAC consists of RFQ and following three types of the RF cavities. The muon acceleration to this energy will be the first case in the world. This poster reports about status of the initial acceleration test with RFQ and the development of the RF cavities, especially for the middle beta section.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA023  
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WEPWA025 RF Acceleration of Ions Produced by Short Pulse Laser ion, laser, experiment, bunching 2548
 
  • Y. Fuwa, M. Hashida, Y. Iwashita, S. Sakabe, H. Tongu
    Kyoto ICR, Uji, Kyoto, Japan
  • M. Okamura
    BNL, Upton, Long Island, New York, USA
  • A. Yamazaki
    Nagoya University, Nagoya, Japan
  
  Funding: This work was supported by Grant-in-Aid for Exploratory Research Number 23654085.
RF acceleration of ions produced by short pulse laser is investigated. An RF cavity is prepared for the acceleration. Some experimental results will be presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA025  
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WEPWA055 Proton Injection into the Fermilab Integrable Optics Test Accelerator (IOTA) proton, electron, optics, injection 2627
 
  • E. Prebys, S. A. Antipov, H. Piekarz
    Fermilab, Batavia, Illinois, USA
  • S. A. Antipov
    University of Chicago, Chicago, Illinois, USA
  
  Funding: This work is supported by the DOE, under Contract No. De-AC02-07CH11359.
The Integrable Optics Test Accelerator (IOTA) is an experimental synchrotron being built at Fermilab to test the concept of non-linear "integrable optics". These optics are based on a lattice including non-linear elements that satisfies particular conditions on the Hamiltonian. The resulting particle motion is predicted to be stable but without a unique tune. The system is therefore insensitive to resonant instabilities and can in principle store very intense beams, with space charge tune shifts larger than those which are possible in conventional linear synchrotrons. The ring will initially be tested with pencil electron beams, but this poster describes the ultimate plan to install a 2.5 MeV RFQ to inject protons, which will produce tune shifts on the order of unity. Technical details will be presented, as well as simulations of protons in the ring. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPWA055  
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WEPMA052 Low Level RF Systems for J-PARC Linac 50-mA Operation linac, cavity, operation, controls 2889
 
  • Z. Fang, Y. Fukui, K. Futatsukawa, T. Kobayashi, S. Michizono
    KEK, Ibaraki, Japan
  • E. Chishiro, F. Sato, S. Shinozaki
    JAEA/J-PARC, Tokai-mura, Japan
  
  In the summer of 2014, lots of improvements were carried out in the J-PARC proton linac, including the ion source, the Radio Frequency Quadrupole linac (RFQ), and the medium-energy beam-transport line from the RFQ to the Drift Tube Linac (DTL) called as MEBT1. The output beam current of the ion source was upgraded from 20 to 50 mA. The previous RFQ with two RF power input ports was replaced by a newly developed RFQ with one input port. The RF power of the solid state amplifier for the rf cavities used in the MEBT1 section were upgraded; from 10 to 30 kW for both of the Buncher-1 and Buncher-2, and from 30 to 120 kW for the Chopper cavity. The old scraper used as dump of chopped beam after the Chopper cavity was also replaced by a new dump system using two scrapers; A new function of separating the chopped beam automatically to the two scrapers was developed by modifying the FPAG control program in the low level control systems. After those improvements, in the September 2014 the J-PARC linac was successfully upgraded for 50-mA beam operation. The details of the improvments, especially for the low level RF systems, will be reported in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMA052  
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WEPMN009 Design and Thermal Analysis of ADS Beam Stop vacuum, target, linac, interface 2931
 
  • M.X. Li, J.L. Wang, L. Wu
    IHEP, Beijing, People's Republic of China
  
  ADS beam stop is an important device which required for the commissioning and accelerator tests of Accelerator Driven Sub-critical System (ADS), it is used to stop the beam which power is about 100kW and consume energy of the beam. This paper will present a triangular prism structure of the ADS beam stop, its mechanical design is described in detail, and there are numerous grooves and ribs in the cooling plates which is the core component of the beam stop. The thermal analysis is performed and its result proves that the triangular prism structure meet the design requirement. Key words：Beam stop, ADS, thermal analysis, triangular prism structure.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN009  
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WEPMN036 Design Study on a High Power RF Amplifier for the RFQ* controls, rf-amplifier, power-supply, operation 3009
 
  • M.-H. Chun, K.-H. Park, I.H. Yu
    PAL, Pohang, Kyungbuk, Republic of Korea
  • J. Bahng
    Kyungpook National University, Daegu, Republic of Korea
  • J.G. Hong, B.S. Lee, J.W. Ok, M. Won
    Korea Basic Science Institute, Busan, Republic of Korea
  • D.S. Kim, Y. Moon, M. Seo
    Dawonsys, Siheung-City, Republic of Korea
  • Y.S. Lee
    SKKU, Suwon, Republic of Korea
  
  Funding: Korea Basic Science Institute in Korea
The design of RF amplifier of 100 kW (CW) at 165MHz is studied for a Radio Frequency Quadruple (RFQ). The RFQ as a linear accelerator is used for acceleration of low energy beam to 500 keV/u at KBSI [1]. An RF amplifier is composed of a drive, an intermediate, and a final amplifier stage with power supplies. The intermediate amplifier (IPA) of 5 kW is designed with solid state amplifier modules, and the final amplifier is designed with a tetrode tube. The high voltage power supply for the tetrode provides the fine regulation of 15 kV at 10 A. The RF amplifier is operated by program logic controller (PLC) with interlocks, and a low level RF control for RFQ accelerator. This paper describes the present design study on the 100 kW RF amplifier.
"*" Supported by Korea Basic Science Institute in Korea 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN036  
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WEPMN052 A New RF Laboratory for Developing Accelerator Cavities at the University of Huelva cavity, ion, heavy-ion, network 3046
 
  • I. Martel, C. Bonțoiu, J.A. Dueñas, D. Gordo-Yáñez, A.K. Orduz, J. Sanchez-Segovia
    University of Huelva, Huelva, Spain
  
  The University of Huelva is presently involved in R&D projects for developing RF accelerator cavities. Two types of cavities are presently under design, a prototype of room temperature RFQ injector and a quarter-wave resonator for high intensity heavy-ion linear accelerators. The laboratory is equipped with dedicated test-bench for RF measurements, which includes high-power RF generators, network analyzer, amplifiers and power meters. A clean room is also available having a dedicated space for high-precision mechanical metrology and cavity mounting, together with a vertical cryostat for superconducting cavity test.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPMN052  
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WEPHA051 Development of a Hybrid Power Supply and RF Transmission Line for SANAEM RFQ Accelerator power-supply, proton, operation, linac 3228
 
  • S. Ogur
    Bogazici University, Bebek / Istanbul, Turkey
  • F. Ahiska
    EPROM Electronic Project & Microwave Ind. and Trade Ltd. Co., Ankara, Turkey
  • A. Alacakir
    SNRTC, Ankara, Turkey
  • G. Turemen
    Ankara University, Faculty of Sciences, Ankara, Turkey
  • G. Unel
    UCI, Irvine, California, USA
  
  SANAEM Project Prometheus (SPP) has been building a proton beamline at MeV range. Its proton source, two solenoids, and a low energy diagnostic box have been already manufactured and installed. These are going to be followed by a 4-vane RFQ to be powered by two stage PSU. The first stage is a custom-built solid state amplifier providing 6 kW at 352.2 MHz operating frequency. The second stage, employing TH 595 tetrodes from Thales, will amplify this input to 160 kW in a short pulsed mode. The power transfer to the RFQ will be achieved by the means of a number of WR2300 full and half height waveguides, 3 1/8" rigid coaxial cables, joined by appropriate adapters and converters and by a custom design circulator. This paper summarizes the experience acquired during the design and the production of these components.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPHA051  
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WEPTY045 High-Intensity Proton RFQ Accelerator Fabrication Status for PXIE cavity, vacuum, alignment, quadrupole 3375
 
  • A.R. Lambert, A.J. DeMello, M.D. Hoff, D. Li, T.H. Luo, J.W. Staples, S.P. Virostek
    LBNL, Berkeley, California, USA
  • R. Andrews, C.M. Baffes, P. Berrutti, T.N. Khabiboulline, G.V. Romanov, D. Snee, J. Steimel
    Fermilab, Batavia, Illinois, USA
  
  Funding: Work supported by the Office of Science, U.S. Department of Energy under DOE contract number DE-AC02-05CH11231
PXIE is a prototype front end system for the proposed PIP-II accelerator upgrade at Fermilab. An integral component of the front end is a 162.5 MHz, normal conducting, CW (continuous wave), radio-frequency quadrupole (RFQ) cavity that was designed and is being fabricated by LBNL. This RFQ will accelerate a continuous stream of up to 10mA of H− ions from 30 keV to 2.1 MeV. The four-vane, 4.45 meter long RFQ consists of four modules, each constructed from 2 pairs of identical modulated vanes. Vane modulations are machined using a custom carbide cutter designed at LBNL. Other machined features include ports for slug tuners, pi-mode rods, sensing loops, vacuum pumps and RF couplers. Vanes at the entrance and exit possess cutbacks for RF matching to the end plates. The vanes and pi-mode rods are bonded via hydrogen brazing with Cusil wire alloy. The brazing process mechanically bonds the RFQ vanes together and vacuum seals the module along its length. Vane fabrication is successfully completed, and the braze process has proved successful. Delivery of the full RFQ beam-line is expected in the middle of 2015. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY045  
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WEPTY048 An RFQ Direct Injection Scheme for the IsoDAR High Intensity H2+ Cyclotron ion, cyclotron, injection, ion-source 3384
 
  • D. Winklehner, J.R. Alonso, J.M. Conrad
    MIT, Cambridge, Massachusetts, USA
  • R.W. Hamm
    R&M Technical Enterprises, Pleasanton, California, USA
  
  IsoDAR is a novel experiment designed to measure neutrino oscillations through electron-antineutrino disappearance, thus providing a definitive search for sterile neutrinos. In order to generate the necessary anti-neutrino flux, a high intensity primary proton beam is needed. In IsoDAR, H2+ is accelerated, and is stripped into protons just before the target, to overcome space charge issues at injection. As part of the design, we have refined an old proposal to use an RFQ to axially inject bunched H2+ ions into the driver cyclotron. This method has several advantages over a classical low energy beam transport (LEBT) design: (1) The bunching efficiency is higher than for the previously considered two-gap buncher and thus the overall injection efficiency is higher. This relaxes the constraints on the H2+ current required from the ion source. (2) The overall length of the LEBT can be reduced. (3) The RFQ can also accelerate the ions. This enables the ion source platform high voltage to be reduced from 70 kV to 30 kV, making underground installation easier. We will present preliminary RFQ design parameters and first beam dynamics simulations from the ion source to the spiral inflector.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-WEPTY048  
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THPF005 The SARAF-LINAC Project for SARAF-Phase 2 linac, solenoid, cryomodule, proton 3683
 
  • N. Pichoff
    CEA/DSM/IRFU, France
  • D. Berkovits, J. Luner, J. Rodnizki
    Soreq NRC, Yavne, Israel
  • P. Bertrand, M. Di Giacomo, R. Ferdinand
    GANIL, Caen, France
  • P. Brédy, G. Ferrand, P. Girardot, F. Gougnaud, M. Jacquemet, A. Mosnier
    CEA/IRFU, Gif-sur-Yvette, France
  
  SNRC and CEA collaborate to the upgrade of the SARAF Accelerator to 5 mA CW 40 MeV deuteron and proton beams (Phase 2). This paper presents the reference design of the SARAF-LINAC Project including a four-vane 176 MHz RFQ, a MEBT and a superconducting linac made of four five-meter cryomodules housing 26 superconducting HWR cavities and 20 superconducting solenoids. The first two identical cryomodules house low-beta (βopt = 0.091), 280 mm long (flange to flange), 176 MHz HWR cavities, the two identical last cryomodules house high-beta (βopt = 0.181), 410 mm long, 176 MHz, HWR cavities. The beam is focused with superconducting solenoids located between cavities housing steering coils. A BPM is placed upstream each solenoid.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF005  
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THPF011 Status of the FAIR Proton Linac linac, cavity, proton, diagnostics 3702
 
  • R. M. Brodhage, M. Kaiser, W. Vinzenz, M. Vossberg
    GSI, Darmstadt, Germany
  • U. Ratzinger
    IAP, Frankfurt am Main, Germany
  
  For the research program with cooled antiprotons at FAIR a dedicated 70 MeV, 70 mA proton injector is required. The main acceleration of this room temperature linac will be provided by six CH cavities operated at 325 MHz. Within the last years, the assembly and tuning of the first power prototype was finished. The cavity was tested with a preliminary aluminum drift tube structure, which was used for precise frequency and field tuning. Afterwards, the final drift tube structure has been welded inside the main tanks and the galvanic copper plating has taken place at GSI workshops. This paper will report on the recent advances with the prototype as well as on the current status of the overall p-Linac project.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF011  
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THPF017 Design Studies for the Proton-Linac RFQ for FAIR proton, linac, acceleration, simulation 3718
 
  • M. Vossberg, R. M. Brodhage, M. Kaiser, F. Maimone, W. Vinzenz, S. Yaramyshev
    GSI, Darmstadt, Germany
  
  The planned 27 m long Proton-Linac (P-LINAC) for FAIR (Facility for Antiproton and Ion Research) comprises a RFQ (Radio-Frequency Quadrupole) and 6 CH-cavities to accelerate a 70 mA proton beam up to 70 MeV. The FAIR Proton-Linac starts with a 325.2 MHz, from 95keV to 3 MeV RFQ accelerator. The main RFQ for this Proton-Linac will be a 4-Vane RFQ. RF analytics with varying and constant transverse focusing strengt for the electrode parameters will be used. CST simulations will help to find cavity parameters for the working frequency. This paper presents the main cavity designs concepts and CST simulation results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF017  
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THPF020 Upgrade of the HSI-RFQ at GSI to Fulfill the FAIR Requirements simulation, multipole, linac, brilliance 3727
 
  • M. Baschke, H. Podlech
    IAP, Frankfurt am Main, Germany
  • W.A. Barth
    GSI, Darmstadt, Germany
  
  In Darmstadt/Germany the existing accelerator facility GSI is expanding to one of the biggest joint research projects worldwide: FAIR, a new antiproton and ion research facility with so far unmatched intensities and quality. The existing accelerators will be used as pre-accelerators and therefor need to be upgraded. In a first step the 36 MHz-HSI-RFQ for high current beams will get new electrodes to fulfill the FAIR requirements. First simulation results for capacity and multipole momentums will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF020  
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THPF022 Design of the 325 MHz 4-Rod RFQ for the FAIR Proton Linac dipole, simulation, operation, higher-order-mode 3733
 
  • B. Koubek, H. Podlech, A. Schempp
    IAP, Frankfurt am Main, Germany
  
  Investigations on the 325 MHz 4-rod RFQ prototype for the FAIR proton linac have confirmed the feasibility of a 4-rod RFQ to work at frequencies above 300 MHz. This RFQ will accelerate protons from 95 keV to 3 MeV within a length of 3.3 m and will be powered by a 2.5 MW klystron. The mechanical and rf design of this RFQ are presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF022  
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THPF024 LEBT Dynamics and RFQ Injection solenoid, ion, injection, collimation 3739
 
  • P.P. Schneider, M. Droba, O. Meusel, H. Niebuhr, D. Noll, O. Payir, H. Podlech, A. Schempp, C. Wiesner
    IAP, Frankfurt am Main, Germany
  
  The Low Energy Beam Transport (LEBT) section at the accelerator-driven neutron source FRANZ* consists of four solenoids, two of which match the primary proton beam into the chopper. The remaining two solenoids are intended to prepare the beam for injection into the RFQ. In the first commissioning phase, the LEBT successfully transported a 14 keV He beam at low intensities**. In the current commissioning phase, the beam energy is increased to the RFQ injection energy of 120 keV. In the upcoming step, the intensity will be increased from 2 mA to 50 mA. Beam dynamics calculations include effects of different source emittances, position and angle offsets and the effects of space charge compensation levels. In addition, the behavior of the undesired hydrogen fractions, H2+ and H3+, and their influence on the performance within the RFQ is simulated.
* Meusel, O., et al. "FRANZ–Accelerator Test Bench And Neutron Source", MO3A03, LINAC 2012.
** Wiesner, C., et al. "Chopping High-Intensity Ion Beams at FRANZ", WEIOB01, LINAC 2014. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF024  
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THPF026 Development of a 325 MHz Ladder-RFQ of the 4-Rod Type simulation, proton, linac, cavity 3745
 
  • M. Schütt, U. Ratzinger
    IAP, Frankfurt am Main, Germany
  • R. M. Brodhage
    GSI, Darmstadt, Germany
  
  For the research program with cooled antiprotons at FAIR a dedicated 70 MeV, 70 mA proton injector is required. In the low energy section, between the Ion Source and the main linac an RFQ will be used. The 325 MHz RFQ will accelerate protons from 95 keV to 3.0 MeV. This particular high frequency for an RFQ creates difficulties, which are challenging in developing this cavity. In order to define a satisfactory 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 have been reached with a ladder type RFQ, which has been investigated since 2013. We present recent 3D simulations of the general layout and of a complete cavity demonstrating the power of a ladder type RFQ as well as measurements of a 0,8 m prototype RFQ, which was manufactured in late 2014 and designed for RF power and vacuum tests. We will outline a possible RF layout for the RFQ within the new FAIR proton injector and highlight the mechanical advantages.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF026  
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THPF028 Conceptual Design of a Novel RFQ for Medical Accelerators ion, simulation, alignment, ion-source 3751
 
  • R. Cee, E. Feldmeier, Th. Haberer, A. Peters, T.W. Winkelmann
    HIT, Heidelberg, Germany
  
  At the Heidelberg Ion Beam Therapy Centre HIT we operate a 4-rod RFQ as first stage of a 7 MeV/u injector linac followed by an IH-DTL. During the first years of patient treatment the injector performance was perfectly adequate, even though the transmission of the linac remained below the theoretical expectations. New developments in dose delivery technology already realised or to come in the future increase the demand on higher beam intensities which will finally result in shorter irradiation times. As measurements performed at our test bench have confirmed that there is a margin for higher transmissions especially for the RFQ we are currently preparing for a new RFQ design. While keeping the original design parameters, the new RFQ should be optimised with respect to the transmission of beams from different ion sources such as electron cyclotron resonance or electron beam ion sources. All parts of the RFQ will be put up for discussion including electrodes, stems, tank and the integrated rebuncher. The design work will profit from new concepts that have evolved at our own and other medical heavy ion facilities in operation and from the progress modern simulation tools have run through.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF028  
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THPF038 RIB Transport and Selection for the SPES Project emittance, simulation, ion, target 3782
 
  • M. Comunian, L. Bellan, A. Pisent
    INFN/LNL, Legnaro (PD), Italy
  • A.D. Russo
    INFN/LNS, Catania, Italy
  
  The SPES project, at Legnaro National Laboratories (LNL) in Italy, is a RIB ISOL facility for the production and acceleration of “neutron-rich” radioactive ion beams. The beam dynamics of the re-accelerator part is presented with the focus on the preselection and transfer to the charge breeder device and from this device to the CW RFQ used as injector to the LNL linac ALPI.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF038  
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THPF040 Recent Progress of the Beam Commissioning in J-PARC Linac DTL, linac, emittance, simulation 3789
 
  • T. Maruta, Y. Liu
    KEK/JAEA, Ibaraki-Ken, Japan
  • K. Futatsukawa, T. Miyao
    KEK, Ibaraki, Japan
  • M. Ikegami
    FRIB, East Lansing, Michigan, USA
  • A. Miura
    JAEA/J-PARC, Tokai-mura, Japan
  
  J-PARC linac iis replaced the front-end in the summer shutdown in year 2014 to extend the maximum peak current to 50 mA from 30 mA. By the combination with the energy upgrade conducted in year 2013, it becomes possible to achieve the design beam energy of 133 kW, which is corresponding to 1 MW at the extraction of 3 GeV Rapid Cycling Sychrotron (RCS). The beam commissioning after the replacement started at Sep./27, and we can successfully accelerate the beam at peak current of 30 mA and 50 mA. In this presentation, we introduce the resent progress of the beam commissioning of the J-PARC linac.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF040  
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THPF045 Simulation Study of Muon Acceleration using RFQ for a New Muon g-2 Experiment at J-PARC simulation, acceleration, experiment, emittance 3801
 
  • Y. Kondo, K. Hasegawa
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
  • R. Kitamura
    University of Tokyo, Tokyo, Japan
  • T. Mibe, M. Otani, N. Saito
    KEK, Tsukuba, Japan
  
  A new muon g-2 experiment is planning at J-PARC. In this experiment, ultra cold muons will be generated and accelerated 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. We present simulation studies of this acceleration test. A design study of a muon dedicated RFQ is also shown.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF045  
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THPF047 New Series of RFQ Vane Shapes acceleration, focusing, multipole, quadrupole 3808
 
  • Y. Iwashita, Y. Fuwa
    Kyoto ICR, Uji, Kyoto, Japan
  
  New series of RFQ vane shapes are under investigation by introducing more terms in addition to the two term potential. Because they can incorporate with the feature of the trapezoidal shape modulation with less multipole components, higher acceleration efficiency is expected. The simulation study will be presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF047  
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THPF049 The Simulation and Manufacture of the Room Temperature Cross-bar H Type Drift Tube Linac cavity, impedance, DTL, proton 3811
 
  • J.H. Li
    China Institute of Atomic Energy, Beijing, People's Republic of China
  • Z. Li
    SCU, Chengdu, People's Republic of China
  
  Funding: This work is supported by the National Natural Science Foundation of China (NSFC).
The room temperature Cross-bar H Type Drift Tube Linac (CH-DTL) is one of the candidate acceleration structures working in CW mode. In order to optimize the parameters, the 3 dimensional electromagnetic field of the CH-DTL cavity is simulated. The method of parameter sweeping with constraint variable is better than the method of parameter sweeping with only one variable during the optimization. In order to simplify the manufacture, the drift tube surface can be designed as spherical shape. The effective shunt impedance of the CH-DTL cavity with cylinder end cup is better than that with cone cup. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF049  
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THPF057 Beam Commissioning of C-ADS Injector-I RFQ Accelerator emittance, proton, linac, simulation 3827
 
  • C. Meng, J.S. Cao, Y.Y. Du, H. Geng, T.M. Huang, R.L. Liu, H.F. Ouyang, W.M. Pan, S. Pei, H. Shi, Y.F. Sui, J.L. Wang, S.C. Wang, F. Yan, Q. Ye, L. Yu, Y. Zhao
    IHEP, Beijing, People's Republic of China
  
  The C-ADS accelerator is a CW (Continuous-Wave) proton linac with 1.5 GeV in beam energy, 10 mA in beam current, and 15 MW in beam power. C-ADS Injector-I accelerator is a 10-mA 10-MeV CW proton linac, which uses a 3.2-MeV normal conducting 4-Vane RFQ and superconducting single-spoke cavities for accelerating. The frequency of RFQ accelerator is 325 MHz. The test stand composed of an ECR ion source, LEBT, RFQ, MEBT and beam dump have been installed and the first stage of beam commissioning have been finished at IHEP in 2014 mid-year. At 90% duty factor, we got 11 mA proton beam at RFQ exit with 90% beam transmission efficiency, while 95% beam transmission efficiency at 70% duty factor. The energy after RFQ was measured by TOF method with FCTs. The transverse emittance measured by double-slits emittance meter was 0.135 π mm-mrad, which of detailed data analysis will be presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF057  
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THPF072 Beam Optics of RISP Linac using Dynac Code linac, simulation, cavity, target 3845
 
  • J.-H. Jang, I.S. Hong, H. Jang, D. Jeon, H. Jin, H.J. Kim
    IBS, Daejeon, Republic of Korea
  
  Funding: This work was supported by the Rare Isotope Science Project of Institute for Basic Science funded by Ministry of Science, ICT and Future Planning.
The RISP (Rare Isotope Science Project) is developing a superconducting linac which accelerates uranium beams up to 200MeV/u with the beam power of 400kW. The linac consists of an injector which includes an ECR ion source and an RFQ, and superconducting cavities which include QWR (Quarter Wave Resonator), HWR (Half Wave Resonator), and SSR (Single Spoke Resonator). Up to HWR, two charge state beams will be accelerated to achieve the required beam current and then five charge state beams will be used to obtain the higher acceleration efficiency. In this work, we performed the beam optics calculation by using a beam dynamics code DYNAC in order to study a possibility of the code as an online model. We compared the results with the calculation in the baseline design by TRACK code. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF072  
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THPF073 Progress of the RAON Heavy Ion Accelerator Project ion, cryomodule, ECR, ion-source 3848
 
  • D. Jeon
    IBS, Daejeon, Republic of Korea
  
  Construction of the RAON heavy ion accelerator facility is under way in Korea that includes both the In-flight Fragment (IF) and Isotope Separation On-Line (ISOL) facilities to support cutting-edge researches in various science fields. Prototyping and testing of major components are proceeding including 28 GHz ECR ion source, RFQ, superconducting cavities, cryomodules, superconducting magnets. Superconducting magnets of 28 GHz ECR ion source are fabricated and tested. First article of prototype superconducting cavities are delivered that were fabricated through domestic vendors and tested at TRIUMF. Prototype HTS(High Tc Superconducting) magnets is in progress. Progress report of the RAON accelerator systems is presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF073  
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THPF076 Thermal and Structural Analysis of the 72.75 MHz LINCE RFQ cavity, simulation, software, controls 3857
 
  • A.K. Orduz, A. Berjillos, C. Bonțoiu, J.A. Dueñas, I. Martel
    University of Huelva, Huelva, Spain
  • A. Garbayo
    AVS, Elgoibar, Spain
  
  Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA.
The 72.75 MHz LINCE RFQ is designed to function at room temperature. Effective operation of the RFQ cavity requires efficient water cooling in order to dissipate significant resistive power non-uniformly distributed on the copper walls and vanes. This amounts to about 10 kWfor one 0.5m long RFQ section. Cylindrical cooling channels have been designed and optimized by varying their diameter and position in order to minimize the frequency shift generated by thermal displacements. The article reports results of power loss simulations coupled with electromagnetic modelling studies and their consequences on the RFQ performance in terms of resonant frequency and thermal deformations. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF076  
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THPF077 Proposal for a 72.75 MHz RFQ for the LINCE Accelerator Complex cavity, simulation, pick-up, Windows 3861
 
  • A.K. Orduz, A. Berjillos, C. Bonțoiu, J.A. Dueñas, I. Martel
    University of Huelva, Huelva, Spain
  • A. Garbayo
    AVS, Elgoibar, Spain
  
  Funding: Work partially supported by the Spanish Government (MINECO-CDTI) under program FEDER INTERCONNECTA
The low-energy part of the LINCE facility can be based on a 72.75MHz normal-conducting RFQ designed to give a 450 keV/u boost for A/Q=7 ions in about 5m length. The vanes have been electromagnetically designed to accommodate dedicated RF windows producing effective separation of the RFQ modes in an octagonal-shaped resonance chamber. This article outlines the optimization of the quality factor of the cavity by using numerical methods for electromagnetic calculations. Experimental results of RF test carried out on a prototype are also discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF077  
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THPF103 Current Status of the SANAEM RFQ Accelerator Beamline plasma, proton, simulation, cavity 3952
 
  • G. Turemen, B. Yasatekin
    Ankara University, Faculty of Sciences, Ankara, Turkey
  • Y. Akgun, A.S. Bolukdemir
    TAEK, Ankara, Turkey
  • A. Alacakir
    SNRTC, Ankara, Turkey
  • A. Bozbey, A. Sahin
    TOBB ETU, Ankara, Turkey
  • S. Erhan
    UCLA, Los Angeles, California, USA
  • Ö. Mete
    UMAN, Manchester, United Kingdom
  • S. Ogur, V. Yildiz
    Bogazici University, Bebek / Istanbul, Turkey
  • S. Oz, A. Ozbey, H. Yildiz
    Istanbul University, Istanbul, Turkey
  • G. Unel
    UCI, Irvine, California, USA
  • F. Yaman
    IZTECH, Izmir, Turkey
  
  The design and production of the proton beamline of SPP, which aims to educate accelerator physicists and serve as particle accelerator technologies test bench, continues at TAEK-SANAEM as a multi-phase project. For the first phase, the 20 keV protons will be accelerated to 1.3 MeV by a single piece RFQ. Currently, the beam current and stability tests are ongoing for the Inductively Coupled Plasma ion source and the measured magnetic field maps of the Low Energy Beam Transport solenoids are being matched to the RFQ acceptance with various beam configurations of the ion source by using computer simulations. The production of the RFQ cavity was started by using high grade aluminum material which will be subsequently coated by Copper to reduce the RF losses. The installation of the low energy diagnostics box was also completed. On the RF side, the development of the hybrid power supply based on solid state and tetrode amplifiers continues. All RF transmission components are already produced with the exception of the circulator and the power coupling antenna which are in the manufacture and design phases, respectively. The acceptance tests of the produced RF components are ongoing. This work summarizes the design, production and test phases of the above mentioned SPP proton beamline components.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF103  
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THPF105 Status of the RAL Front End Test Stand emittance, proton, quadrupole, ion 3959
 
  • A.P. Letchford, M.A. Clarke-Gayther, M. Dudman, D.C. Faircloth, S.R. Lawrie
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  • S.M.H. Alsari, M. Aslaninejad, J.K. Pozimski, P. Savage
    Imperial College of Science and Technology, Department of Physics, London, United Kingdom
  • J.J. Back
    University of Warwick, Coventry, United Kingdom
  • G.E. Boorman, A. Bosco, S.M. Gibson
    Royal Holloway, University of London, Surrey, United Kingdom
  • R.T.P. D'Arcy, S. Jolly
    UCL, London, United Kingdom
  • J.K. Pozimski
    STFC/RAL, Chilton, Didcot, Oxon, United Kingdom
  
  The Front End Test Stand (FETS) under construction at RAL is a demonstrator of front end systems for future high power proton linacs. Possible applications include a linac upgrade for the ISIS spallation neutron source, new future neutron sources, accelerator driven sub-critical systems, high energy physics proton drivers etc. Designed to deliver a 60mA H-minus beam at 3MeV with a 10% duty factor, FETS consists of a high brightness surface plasma ion source, magnetic solenoid low energy beam transport (LEBT), 4-vane 324MHz radio frequency quadrupole and medium energy beam transport (MEBT) containing a high speed beam chopper and non-destructive laser diagnostics. This paper describes the current status of the project and future plans.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF105  
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THPF110 Offline Testing of the CARIBU EBIS Charge Breeder ion, electron, operation, ion-source 3973
 
  • C. Dickerson, S.A. Kondrashev, P.N. Ostroumov, R.C. Vondrasek
    ANL, Argonne, Illinois, USA
  • A. Perry
    Illinois Institute of Technology, Chicago, Illlinois, USA
  
  Funding: This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357.
In 2015 an electron beam ion source (EBIS) will be installed at the ATLAS facility to charge breed radioactive beams from the Californium Rare Isotope Breeder Upgrade (CARIBU). Currently an ECR ion source is used to charge breed CARIBU beams. The EBIS will provide beams with much less contamination and higher breeding efficiencies. In preparation for its installation at ATLAS the EBIS has been successfully commissioned offline. The EBIS was configured in the offline facility to closely mimic the conditions expected in the ATLAS installation, so commissioning results should be representative of its performance with CARIBU. The EBIS breeding efficiency was tested with pulses of 133Cs1+ from a surface ionization source, and for multiple operational modes maximum breeding efficiencies greater than 25% could be achieved. After transmission losses the total efficiency of the system was 15-20%. The contaminants were expectedly very low for a UHV system with nominal pressures of ~1 – 3 x 10-10 Torr. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF110  
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THPF127 Scheme for a Low Energy Beam Transport with a Non-neutralized Section ion, space-charge, emittance, ion-source 4016
 
  • A.V. Shemyakin, L.R. Prost
    Fermilab, Batavia, Illinois, USA
  
  Funding: Fermilab is operated by Fermi Research Alliance, LLC, under Contract DE-AC02-07CH11359 with the United States Department of Energy
A Low Energy Beam Transport (LEBT) line is the part of a modern ion accelerator between an ion source (IS) and a Radio-Frequency Quadrupole (RFQ). Typically, it includes 1-3 solenoidal lenses for focusing and relies on transport dynamics with nearly complete beam space charge neutralization over the entire length of the LEBT. In this paper, we discuss the possibility and rationality of imposing un-neutralized transport in the portion of the LEBT adjacent to the RFQ. For estimations, we will use the parameters from PXIE, a test accelerator presently being constructed at Fermilab. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF127  
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THPF148 LANSCE H+ RFQ Status beam-transport, ion, ion-source, linac 4073
 
  • R.W. Garnett, Y.K. Batygin, C.A. Chapman, I.N. Draganic, C.M. Fortgang, S.S. Kurennoy, R.C. McCrady, J.F. O'Hara, E.R. Olivas, L. Rybarcyk, H.R. Salazar
    LANL, Los Alamos, New Mexico, USA
  • J. Haeuser
    Kress GmbH, Biebergemuend, Germany
  • B. Koubek, A. Schempp
    IAP, Frankfurt am Main, Germany
  
  Funding: This work is supported by the U. S. Department of Energy Contract DE-AC52-06NA25396.
The LANSCE linear accelerator at Los Alamos National Laboratory provides H− and H+ beams to several user facilities that support Isotope Production, NNSA Stockpile Stewardship, and Basic Energy Science programs. These beams are initially accelerated to 750 keV using Cockcroft-Walton (CW) based injectors that have been in operation for over 37 years. To reduce long-term operational risks and to realize future beam performance goals for LANSCE we are completing fabrication of a 4-rod Radio-Frequency Quadrupole (RFQ) and design of an associated beam transport line that together will eventually become the modern injector replacement for the existing obsolete H+ injector system. A similar H− system is also planned for future implementation. An update on the status and progress of the project will be presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF148  
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THPF149 Electromagnetic Modeling of 4-Rod RFQ Tuning simulation, vacuum, quadrupole, linac 4076
 
  • S.S. Kurennoy, L. Rybarcyk
    LANL, Los Alamos, New Mexico, USA
  
  Modern codes make possible detailed 3D electromagnetic modeling of RFQ accelerators. We have recently analyzed two 201.25-MHz 4-rod RFQs – one commissioned at FNAL and a new design for LANL – with CST Studio using imported manufacturer CAD files*. The RFQ electromagnetic analysis with MicroWave Studio (MWS) was followed by beam dynamics modeling with Particle Studio as well as other multi-particle codes. Here we apply a similar approach to study the process of RFQ tuning in 3D CST models. In particular, the results will be used to better understand tuning the voltage flatness along the new LANL 4-rod RFQ.
* S.S. Kurennoy, LINAC14, Geneva, Switzerland, 2014, THPP097. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF149  
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THPF150 3D Electromagnetic and Beam Dynamics Modeling of the LANSCE Drift-Tube Linac DTL, simulation, beam-losses, linac 4079
 
  • S.S. Kurennoy, Y.K. Batygin
    LANL, Los Alamos, New Mexico, USA
  
  The LANSCE drift-tube linac (DTL) accelerates the proton or H− beam to 100 MeV. It consists of four tanks containing tens of drift tubes and post-couplers; for example, tank 2 is almost 20 m long and has 66 cells. We have developed 3D models of full tanks [1] in the DTL with CST Studio to accurately calculate the tank modes, their sensitivity to post-coupler positions and tilts, tuner effects, and RF-coupler influence. Electromagnetic analysis of the DTL tank models is performed using MicroWave Studio (MWS). The full-tank analysis allows tuning the field profile of the operating mode and adjusting the frequencies of the neighboring modes within a realistic CST model. Beam dynamics is modeled with Particle Studio for bunch trains with realistic initial beam distributions using the MWS-calculated and tuned RF fields and quadrupole magnetic fields to determine the output beam parameters and locations of particle losses.
* S.S. Kurennoy, LINAC14, Geneva, Switzerland, 2014, MOPP106. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-THPF150  
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FRXB3 Advances in CW Ion Linacs linac, cavity, cryomodule, ion 4085
 
  • P.N. Ostroumov
    ANL, Argonne, Illinois, USA
  
  Funding: This work was supported by the U.S. Department of Energy, Office of High Energy Physics and Nuclear Physics, under Contracts DE-AC02-76CH03000 and DE-AC02-06CH11357.
Substantial research and development related to CW proton and ion accelerators are being performed at ANL. A normal conducting CW RFQ and a 4K cryomodule with seven quarter-wave resonators (QWR) and SC solenoids have been developed, built, commissioned and operated as an upgrade of the CW ion linac, ATLAS, to achieve higher efficiency and beam intensities. The new CW RFQ and cryomodule were fully integrated into ATLAS and have been in routine operation for more than a year. Currently we are engaged in development of the first cryomodule for a CW H linac being built at FNAL. This work is well aligned with the development of a 1 GeV 25 MW linac as the driver of a sub-critical assembly for near-term spent nuclear fuel disposal. A 2K cryomodule with eight 162.5-MHz SC half wave resonators (HWR) and eight SC solenoids is being developed for FNAL and scheduled for commissioning in 2017. The testing of the first 2 HWRs demonstrated remarkable performance. Experience with the development and reliable operation of new copper and superconducting accelerating structures is an essential precursor for advanced, reliable future large scale high power CW accelerators. 		 
slides icon Slides FRXB3 [4.963 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-FRXB3  
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FRYGB1 High Power Proton Beam Facilities: Operational Experience, Challenges, and the Future target, proton, hardware, operation 4102
 
  • S.M. Cousineau
    ORNL, Oak Ridge, Tennessee, USA
  
  High power proton accelerators are increasingly popular as drivers for secondary beams with a large variety of applications, such as neutron sources for materials science and neutrino factories for high energy physics. In the last few decades, average beam powers have increased substantially, giving rise to an array of challenges centered on providing high beam power and availability while maintaining low activation levels. This talk summarizes the current status of high power proton accelerators. It discusses recent operational experiences and lessons learned, and identifies the primary hardware and beam dynamics limitations. A brief review of planned next generation facilities and driving technologies is also presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2015-FRYGB1  
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