Keyword: linac
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MOXA02 The Commissioning of the European XFEL Linac and its Performance ion, MMI, FEL, cavity 1
 
  • D. Reschke, W. Decking, N. Walker, H. Weise
    DESY, Hamburg, Germany
  
  Funding: Presented on behalf of the XFEL Accelerator Consortium. Work supported by the respective funding agencies of the contributing institutes; for details see www.xfel.eu.
The main linac of the superconducting accelerator of the European XFEL presently consists of 96 accelerator modules, each housing eight 1.3 GHz TESLA-type cavi-ties, with an average design gradient of 23.6 MV/m. The performance of each individual module has been tested after module assembly in the Accelerator Module Test Facility (AMTF) at DESY. The 2-year period of module installation to the accelerator tunnel was finished in August 2016. In order to recheck and re-establish the performance of the input power couplers, warm processing of nearly all installed modules was performed before the first cool-down during Dec 2016 / Jan 2017. Four consecutive modules are connected to one 10 MW klystron and form a so-called RF station, which is powered and controlled individually during operation. By June 2017 23 of 25 RF stations have been commissioned for beam acceleration including frequency tuning, various calibrations and LLRF adjustments. A preliminary beam energy of 14 GeV was achieved, which is sufficient for first lasing experiments. No significant performance degradation has been observed so far. The commissioning experience and the available RF performance data will be presented. 		 
slides icon Slides MOXA02 [6.896 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOXA02  
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MOXA03 The 30MeV Stage of the ARIEL e-linac ion, cavity, cryomodule, electron 6
 
  • R.E. Laxdal, Z.T. Ang, T. Au, K. Fong, O.K. Kester, S.R. Koscielniak, A.N. Koveshnikov, M.P. Laverty, Y. Ma, D.W. Storey, E. Thoeng, Z.Y. Yao, Q. Zheng, V. Zvyagintsev
    TRIUMF, Vancouver, Canada
  
  A MW class cw superconducting electron linac (e-Linac) is being installed at TRIUMF as a driver for radioactive beam production as part of the ARIEL project. The e-linac final configuration is planned to consist of five 1.3GHz nine-cell cavities housed in three cryomodules with one single cavity injector cryomodule (EINJ) and two double cavity accelerating cryomodules (EACA, EACB) to accelerate in continuous-wave (cw) up to 10mA of electrons to 50MeV. The e-Linac is being installed in stages. A demonstrator phase (2014) consisting of a 300kV electron gun, EINJ, and a partially outfitted EACA with just one accelerating cavity was installed for initial technical and beam tests to 22.9MeV. A Stage 2 upgrade now installed has a completed EACA to reach an operational goal of 3mA of electrons to 30MeV for first science from the ARIEL ISOL targets. A single 290kW klystron is used to feed the two EACA cavities in vector-sum closed-loop control. The paper is focused on the SRF challenges: systems design, cavity and cryomodule performance, rf ancillaries preparation and performance, LLRF and RF system performance and final beam test results.  
slides icon Slides MOXA03 [13.981 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOXA03  
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MOXA04 Superconducting Accelerator for ERL Based FEL EUV Light Source at KEK ion, cavity, HOM, operation 13
 
  • H. Sakai, E. Kako, T. Konomi, T. Kubo, K. Umemori
    KEK, Ibaraki, Japan
  • T. Ota
    Toshiba, Yokohama, Japan
  • M. Sawamura
    QST, Tokai, Japan
  
  An energy recovery linac (ERL)-based free electron laser (FEL) is a possible candidate of a tens of kW EUV source and open the era for next generation EUV-lithography. We have designed the 10 mA class ERL-based EUV-FEL source to generate more than 10 kW power. One of the key technologies is CW superconducting cavities to realize the energy recovery of high beam current of more than 10 mA by suppressing HOMs and high gradient acceleration of higher than 12 MV/m. This CW superconducting cavity had been developed through the construction of the Compact ERL facility in KEK and it successfully achieved the energy recovery of 1 mA CW beam until now. In this talk, first we express our design strategies of SRF cavities of the main linac of ERL-EUV light sources not only to suppress the HOMs but also to overcome the field emission problem by modifying the main linac cavity of Compact ERL more sophisticatedly. Next we show the recent development works for ERL-EUV superconducting cavity about HOM damper, cryomodule, and its clean string-assembly work by using horizontal test stand.  
slides icon Slides MOXA04 [5.938 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOXA04  
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MOXA07 Development of the C-ADS SRF Accelerator at IHEP ion, cavity, cryomodule, operation 19
 
  • F. Yan, L. Bian, J.S. Cao, Y. Chen, Y.L. Chi, J.P. Dai, L. Dong, L.L. Dong, Y.Y. Du, H.F.S. Feisi, Y. Gao, R. Ge, H. Geng, D.Z. Guo, D.Y. He, J. He, T.M. Huang, X. Jing, B. Li, H. Li, L. Li, S.P. Li, H.Y. Lin, F. Liu, R.L. Liu, F. Long, Y.H. Lu, H.Z. Ma, Q. Ma, X. Ma, C. Meng, Z.H. Mi, H.F. Ouyang, W.M. Pan, S. Pei, Q.L. Peng, X.H. Peng, P. Sha, H. Shi, P. Su, Y.F. Sui, L.R. Sun, X.T. Sun, G.W. Wang, J.L. Wang, S.C. Wang, G. Wu, O. Xiao, X.C. Yang, Q. Ye, R. Ye, L. Yu, X.Y. Zhang, X.Y. Zhao, Y.L. Zhao, Y. Zhao, Z.H. ZhenHua, N. Zhou, Z.S. Zhou
    IHEP, Beijing, People's Republic of China
  • H.Y. Zhu
    Institute of High Energy Physics (IHEP), People's Republic of China
  
  Funding: CAS Strategic Priority Research Program-Future Advanced Nuclear Fission Energy (Accelerator-Driven Sub-critical System) and National Natural Science Foundation of China, under contract NO. 11405190
The 10 MeV accelerator-driven subcritical system (ADS) Injector I test stand at Institute of High Energy Physics (IHEP) is a testing facility dedicated to demonstrate one of the two injector design schemes [Injector Scheme-I, which works at 325 MHz], for the ADS project in China. The ion source was installed since April of 2014, periods of commissioning are regularly scheduled between installation phases of the rest of the injector. Early this year, continuous wave (CW) proton beam has been successfully obtained with energy of 10MeV and average beam current around 2 mA, the single spoke cavities with smallest developed beta (βg=0.12) were applied and successfully commissioned. Single spoke cavities with higher beta (βg=0.21) were also adopted for the last cryomodule of 25MeV proton linac, and 170uA CW proton beam were shooting through recently. This contribution reports the details of the development of the C-ADS SRF accelerator at IHEP and the challenges of the CW machine commissioning 		 
slides icon Slides MOXA07 [5.605 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOXA07  
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MOYA01 The Superconducting Accelerator for the ESS Project ion, cavity, cryomodule, SRF 24
 
  • F. Schlander, C. Darve, N. Elias, M. Lindroos, C.G. Maiano
    ESS, Lund, Sweden
  • P. Bosland
    CEA/IRFU, Gif-sur-Yvette, France
  • M. Ellis
    STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
  • P. Michelato
    INFN/LASA, Segrate (MI), Italy
  • G. Olry
    IPN, Orsay, France
  • R.J.M.Y. Ruber
    Uppsala University, Uppsala, Sweden
  
  The European Spallation Source, ESS, is under construction in Lund since 2014. While the installation of the source and the normal conducting part will start in this autumn, the production and testing of cryomodules and cavities for the superconducting accelerator is in full swing at the partner laboratories. The spoke cavities and cryomodules will be provided by IPN Orsay and the testing of those modules will take place at Uppsala University. Prototyping and assembly of the elliptical cryomodules series is occurring at CEA Saclay, and the modules will be tested at a new test stand at ESS. The fabrication and test of the medium beta cavities is provided by INFN Milan and STFC Daresbury for the high beta cavities respectively. An overview of the current activities and test results will be presented in this talk.  
slides icon Slides MOYA01 [26.361 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOYA01  
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MOPB001 Concepts and Design for Beamline HOM Dampers for eRHIC ion, HOM, cavity, impedance 39
 
  • P. Kolb, Y. Gao, D. Holmes, K.S. Smith, W. Xu
    BNL, Upton, Long Island, New York, USA
  • Y. Gao
    PKU, Beijing, People's Republic of China
  
  Funding: Work supported by LDRD program of Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. DOE.
In the design of eRHIC at BNL, HOM power plays a major role for the SRF installation. Depending on the final accelerator design and choice of cavity, up to 100kW of HOM power is estimated to be generated, presenting a big challenge for the HOM damping concept. Due to this high amount of HOM power, all current concepts for eRHIC would use room temperature beam line absorbers equipped with silicone-carbide dielectrics to absorb HOM power. Concepts, designs and simulations for these beam line absorbers will be presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB001  
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MOPB005 Beam Dynamics Simulations for the New Superconducting CW Heavy Ion Linca at GSI ion, cavity, heavy-ion, accelerating-gradient 56
 
  • M. Schwarz, M. Basten, M. Busch, H. Podlech, U. Ratzinger, R. Tiede
    IAP, Frankfurt am Main, Germany
  • W.A. Barth, S. Yaramyshev
    MEPhI, Moscow, Russia
  • W.A. Barth, M. Heilmann, S. Yaramyshev
    GSI, Darmstadt, Germany
  • W.A. Barth, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu
    HIM, Mainz, Germany
  
  Funding: Work supported by BMBF contr. No. 05P15RFRBA
For future experiments with heavy ions near the coulomb barrier within the super-heavy element (SHE) research project a multi-stage R&D program of GSI, HIM and IAP is currently in progress. It aims at developing a superconducting (sc) continuous wave (CW) LINAC with multiple CH cavities as key components downstream the upgraded High Charge Injector (HLI) at GSI. The LINAC design is challenging, due to the requirement of intense beams in CW-mode up to a mass-to-charge ratio of 6 while covering a broad output energy range from 3.5 to 7.3 MeV/u with minimum energy spread. After sucessful tests with the first CH cavity in 2016 demonstrated a promising maximum accelerating gradient of Ea = 9.6 MV/m, recently first beam tests have been started as next milestone at GSI, confirming its flawless functionality*.
W. Barth et al., Further Layout Investigations for a Superconducting CW-linac for Heavy Ions at GSI, 18th Int. Conf. on RF Superconductivity (SRF17), Lanzhou, China, July 2017, paper MOPB023. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB005  
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MOPB007 Design of the Superconducting Quarter Wave Resonators for HIAF ion, cavity, heavy-ion, ECR 59
 
  • C. Zhang, L. Chen, Q.W. Chu, H. Guo, Y. He, S.C. Huang, Y.L. Huang, T.C. Jiang, L. Li, Y.M. Li, F. Pan, T. Tan, R.X. Wang, A.D. Wu, Q.J. Wu, P.R. Xiong, W.M. Yue, S.H. Zhang, S.X. Zhang
    IMP/CAS, Lanzhou, People's Republic of China
  
  A heavy ion accelerator facility (HIAF) is under development in the Institute of Modern Physics. For the low energy superconducting accelerating section, two types of quarter wave resonators with frequency of 81.25 MHz and β of 0.05 and 0.10 have been proposed. The electro-magnetic design has been optimized in order to reach the high accelerating voltage, and the optimization also included the drift tube face tilting to compensate for the beam steering caused by the asymmetry in the quarter wave resonator geometry.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB007  
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MOPB009 Progress of 650 MHz SRF Cavity for eRHIC SRF Linac cavity, ion, SRF, HOM 64
 
  • W. Xu, I. Ben-Zvi, Y. Gao, D. Holmes, P. Kolb, G.T. McIntyre, C. Pai, R. Porqueddu, K.S. Smith, R. Than, J.E. Tuozzolo, F.J. Willeke, A. Zaltsman
    BNL, Upton, Long Island, New York, USA
  • I. Ben-Zvi
    Stony Brook University, Stony Brook, USA
  
  Funding: This work is supported by LDRD program of Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. DOE.
eRHIC ERL SRF requires 160 5-cell 650 MHz SRF cavities. The 650 MHz cavity has been designed and two prototypes have been fabricated, one Cu cavity for HOM study and one Nb cavity for cavity performance study. This paper will describe cavity design and the progress of prototyping. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB009  
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MOPB015 Accelerator Module Repair for the European XFEL Installation ion, FEL, cavity, vacuum 82
 
  • E. Vogel, S. Barbanotti, F. Hoffmann, K. Jensch, D. Kostin, L. Lilje, W.-D. Möller, M. Schmökel, H. Weise
    DESY, Hamburg, Germany
  • S. Berry, O. Napoly
    CEA/DSM/IRFU, France
  • M. Sienkiewicz, J. Świerbleski, M. Wiencek
    IFJ-PAN, Kraków, Poland
  
  Repair actions of different extent have been performed at 61 modules of the 100 accelerating series modules for the European XFEL to qualify them for the tunnel installation. Four modules could not be repaired in time. CEA Saclay managed to perform three major repairs in parallel to the series module integration, the residual repair actions took place at DESY Hamburg. In this paper we will give an overview on the various technical problems which required being fixed before the tunnel installation and on the repair actions performed.  
poster icon Poster MOPB015 [9.354 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB015  
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MOPB018 Testing of SRF Cavities and Cryomodules for the European Spallation Source ion, cavity, cryomodule, SRF 95
 
  • N. Elias, E. Asensi Conejero, C. Darve, N.F. Hakansson, W. Hees, C.G. Maiano, F. Schlander
    ESS, Lund, Sweden
  
  The European Spallation Source (ESS) is currently under construction in Lund, Sweden. The ESS linear accelerator aims to deliver a 62.5 mA , 2.86 ms long proton beam onto a rotating tungsten target, at 14 Hz repetition rate, thus achieving an energy of 2 GeV and 5 MW power. Most of the beam acceleration happens in the superconducting fraction of the linac, which is composed of three sectors of cryomodules named after the cavities housed within. The first sector of the SRF linac is composed of 13 Spoke cryomodules containing 2 double-spoke cavities with a geometric beta of 0.5, the second is composed of 9 medium beta cryomodules each housing four elliptical cavities (β=0.67) and finally 21 high beta cryomodules enclosing four elliptical cavities (β=0.86). ESS has strategically built up a SRF collaboration with other European institutions, these partners will deliver through In-Kind agreements cavities and cryomodules performing within the ESS specification. This article describes the process leading to the acceptance of cavities and cryomodules received from the different partners and the necessary testing required prior to the final installation in the ESS tunnel.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB018  
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MOPB023 Further Layout Investigations for a Superconducting CW-linac for Heavy Ions at GSI ion, cavity, heavy-ion, SRF 108
 
  • W.A. Barth, K. Aulenbacher, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu
    HIM, Mainz, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
  • W.A. Barth, M. Heilmann, S. Yaramyshev
    GSI, Darmstadt, Germany
  • W.A. Barth, S. Yaramyshev
    MEPhI, Moscow, Russia
  • M. Basten, H. Podlech, M. Schwarz
    IAP, Frankfurt am Main, Germany
  
  Very compact accelerating-focusing structures, as well as short focusing periods, high accelerating gradients and very short drift spaces are strongly required for superconducting (sc) accelerator sections operating at low and medium beam energies. To keep the GSI-Super Heavy Element program competitive on a high level and even beyond, a standalone sc continuous wave Linac in combination with the GSI High Charge State injector, upgraded for cw-operation, is envisaged. The first LINAC section (financed by HIM and GSI) as a demonstration of the capability of 216 MHz multi gap Crossbar H-structures (CH) is still in the beam commissioning phase, while an accelerating gradient of 9.6 MV/m (4 K) at a sufficient quality factor has been already reached. Recently the overall Linac design, based on a standard cryomodule, comprising three CH cavities, a rebuncher section and two 9.3 T-solenoidal lenses, has to be fixed. This paper presents the status of the Linac layout studies as well as the integration in the GSI accelerator facility.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB023  
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MOPB024 Steps Towards Superconducting CW-linac for Heavy Ions at GSI ion, cavity, solenoid, heavy-ion 112
 
  • M. Miski-Oglu, M. Amberg, K. Aulenbacher, W.A. Barth
    HIM, Mainz, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
  • W.A. Barth, V. Gettmann, M. Heilmann, S. Yaramyshev
    GSI, Darmstadt, Germany
  • W.A. Barth, S. Yaramyshev
    MEPhI, Moscow, Russia
  • M. Basten, M. Busch, H. Podlech, M. Schwarz
    IAP, Frankfurt am Main, Germany
  
  A superconducting (sc) cw-Linac at GSI should ensure competitive production of Super Heavies in the future. Further R&D for this cw-Linac, a so called 'Advanced CW-Demonstrator', with maximal energy of 3.5 MeV/u is ongoing. As a first step, the demonstrator project with one sc CH-cavity is near its completion, the beam tests are scheduled for mid-summer 2017. The completion of the 'Advanced CW-Demonstrator' includes successive construction of two new cryogenic modules comprising four CH-cavities and two solenoids each. In this contribution the layout of the cryomodules and the Helium distribution system are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB024  
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MOPB034 Selection of the Type of Accelerating Structures for the Second Group of Cavity SC Linac Nuclotron-NICA cavity, ion, accelerating-gradient, multipactoring 125
 
  • M. Gusarova, A.A. Gorchakov, M.V. Lalayan, D.V. Surkov, K.V. Taletskiy
    MEPhI, Moscow, Russia
  • A.V. Butenko
    JINR/VBLHEP, Dubna, Moscow region, Russia
  • D.A. Shparla
    Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, Belarus
  • A.O. Sidorin, G.V. Trubnikov
    JINR, Dubna, Moscow Region, Russia
  
  The paper summorises the research results aimed on the choice of superconducting accelerating cavities for the second section of the SC linac Nuclotron-NICA injector project. This choice was based on comparative analysis of accelerating structures electrodynamic characteristics taking into account technological challenges of bulk niobium cavities production.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB034  
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MOPB042 The TRIUMF/VECC Injector Cryomodule Performance ion, cavity, cryomodule, TRIUMF 144
 
  • Y. Ma, K. Fong, T. Junginger, D. Kishi, A.N. Koveshnikov, R.E. Laxdal, N. Muller, R.R. Nagimov, D.W. Storey, E. Thoeng, Z.Y. Yao, V. Zvyagintsev
    TRIUMF, Vancouver, Canada
  • U. Bhunia, A. Chakrabarti, S. Dechoudhury, V. Naik
    VECC, Kolkata, India
  
  The collaboration on superconducting electron Linac for rare ion beam facilities ARIEL (Advanced Rare Iso-topE Laboratory) [1-4] and ANURIB [5] (Advanced Na-tional facility for Unstable and Rare Isotope Beams) has resulted in production of a superconducting Injector Cryomodule (VECC ICM) at TRIUMF for VECC. The cryomodule design utilizes a unique box cryomodule with a top-loading cold mass. The hermetic unit consists of a niobium cavity which operating at 1.3GHz and connected with two symmetrically opposed couplers which can deliver 100kW RF power to the beam. Liquid helium supplied at 4.4 K is converted to superfluid helium-II through a cryogenic insert on board which includes 4 K phase separator, 4K/2K heat exchanger and Joule-Thompson valve. In 2016, the VECC ICM has been tested at TRIUMF and demonstrated 10.5 MeV acceleration. A summary of the VECC ICM commissioning are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB042  
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MOPB062 Development of HOM Absorbers for CW Superconducting Cavities in Energy Recovery Linac HOM, ion, cavity, superconducting-cavity 191
 
  • T. Ota, A. Miyamoto, K. Sato, M. Takasaki, M. Yamada
    Toshiba, Yokohama, Japan
  • E. Kako, T. Konomi, H. Sakai, K. Umemori
    KEK, Ibaraki, Japan
  
  Higher Order Modes (HOM) absorbers for superconducting cavities have been developing at TOSHIBA in collaboration with High Energy Accelerator Research Organization (KEK) since 2015. Prototype HOM absorbers for 1.3 GHz 9-cell superconducting cavity were fabricated. An AlN lossy dielectrics cylinder was brazed with a copper cylinder, and the cool-down tests by nitrogen gas was carried out. Copper cylinders and SUS flanges were joined by electron beam welding to fabricate a whole prototype HOM absorber. Fabrication process of the prototype HOM absorber will be presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB062  
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MOPB094 Commissioning of Demonstrator Module for CW Heavy Ion LINAC@GSI ion, cavity, solenoid, heavy-ion 283
 
  • V. Gettmann, K. Aulenbacher, W.A. Barth, F.D. Dziuba, T. Kürzeder, M. Miski-Oglu
    HIM, Mainz, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
  • W.A. Barth, M. Heilmann, S. Yaramyshev
    GSI, Darmstadt, Germany
  • W.A. Barth, S. Yaramyshev
    MEPhI, Moscow, Russia
  • M. Basten, H. Podlech, M. Schwarz
    IAP, Frankfurt am Main, Germany
  
  The cw - Linac - demonstrator is a prototype of the first section of the proposed cw-LINAC@GSI, comprising a superconducting CH-cavity embedded by two superconducting solenoids. The sc CH-structure is the key component and offers a variety of research and development. The beam focusing solenoids provide maximum fields of 9.3 T at an overall length of 380 mm and a free beam aperture of 30 mm. The magnetic induction at the fringe is minimized to 50 mT at the inner NbTi-surface of the neighboring cavity. The fabrication of the key components is finished, as well as the cold performance testing of the RF cavity. The cryostat is ready for assembling and the test environment is completely prepared. After successful testing of the RF-Power coupler, the components will be assembled to the suspended frame under cleanroom conditions. Alignment, assembly, under cleanroom condition issues will be presented.  
poster icon Poster MOPB094 [2.881 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB094  
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MOPB099 Design of C-ADS Injector-I Cryomodule for 325MHz Cavities ion, cryomodule, cavity, solenoid 294
 
  • R. Ge, L. Bian, R. Han, S.P. Li, M.J. Sang, L.R. Sun, M.F. Xu, R. Ye, J.Q. Zhang, J.H. Zhang, X.Z. Zhang
    IHEP, Beijing, People's Republic of China
  
  Funding: Supported by Strategic Priority Research Program of CAS (XDA030213)
The Chinese Accelerator Driven Sub-critical system (C-ADS) uses a high energy proton beam to bombard the metal target and generate neutrons to deal with the nuclear waste. The Chinese ADS proton linear has two 0~10 MeV injectors and one 10~1500 MeV superconducting linac. Injector-I is studied by the Institute of High Energy Physics (IHEP) under construction in the Beijing, China. The linear accelerator consists of two accelerating cryomodules operating at the temperature of 2 Kelvin. This paper describes the structure and thermal performances analysis of the cryomodule. The analysis takes into account all the main contributors (support posts, multilayer insulation, current leads, power couplers, and cavities) to the static and dynamic heat load at various cryogenic temperature levels. The thermal simulation analysis of the cryomodule is important theory foundation of optimization and commissioning. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB099  
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MOPB102 Preliminary Design on the Cryomodule of the HWR for the Secondary Particle Generation at KOMAC cryomodule, ion, proton, cavity 301
 
  • H.-J. Kwon, Y.-S. Cho, J.J. Dang, H.S. Kim, K.H. Kim, S. Lee, Y.G. Song
    Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
  
  Funding: This work has been supported through KOMAC (Korea of Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning).
A 100 MeV proton linac based on the radio frequency quadrupole and conventional drift tube linac has been operating for user service at KOMAC (Korea Multi-purpose Accelerator Complex). A superconducting linac based on the half-wave resonator is studied in order to increase the proton energy from 100 MeV to 160 MeV for secondary particle generation such as neutron. A cryomodule and its cryogenics were designed. The operating temperature of the HWR is 2 K. One cryomodule contains four HWR cavities and it didn't have superconducting solenoid because a doublet lattice using normal conducting magnet was considered as focusing elements. A thermal design was conducted and the structure was designed based on the existing well proven technologies. The results of the design on the cryomodule and cryogenics for KOMAC HWR are summarized and discussed in the conference. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB102  
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MOPB105 Thermosiphon Cooling Loops for ARIEL Cryomodules ion, cryomodule, cavity, TRIUMF 309
 
  • Y. Ma, A.N. Koveshnikov, D. Lang, R.E. Laxdal, N. Muller
    TRIUMF, Vancouver, Canada
  
  Thermosiphon cooling loops have been used in ARIEL[1,2] cryomodules for 1.3GHz superconducting cavities cooling. It can deliver 4K liquid Helium from 4K phase separator to cavity thermal intercepts and return the vaporized liquid to the 4K phase separator as a refrigerator load. The design and test results are presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB105  
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TUXAA02 HIE Isolde Cavity Production & Cryomodule Commissioning, Lessons Learned ion, cavity, ISOL, cryomodule 338
 
  • W. Venturini Delsolaro, K. Artoos, O. Brunner, O. Capatina, K.M. Dr. Schirm, Y. Kadi, Y. Leclercq, A. Miyazaki, E. Montesinos, V. Parma, G.J. Rosaz, A. Sublet, S. Teixeira Lopez, M. Therasse, L.R. Williams
    CERN, Geneva, Switzerland
  
  The lessons learned during the HIE Isolde Cavity Production, the Cryo Module Assembly and Commissioning will be presented  
slides icon Slides TUXAA02 [8.191 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUXAA02  
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TUXAA03 Progress of FRIB SRF Production ion, cavity, cryomodule, SRF 345
 
  • T. Xu, H. Ao, B. Bird, N.K. Bultman, F. Casagrande, C. Compton, K.D. Davidson, K. Elliott, A. Facco, V. Ganni, A. Ganshyn, W. Hartung, M. Ikegami, P. Knudsen, S.M. Lidia, E.S. Metzgar, S.J. Miller, D.G. Morris, P.N. Ostroumov, J.T. Popielarski, L. Popielarski, M.A. Reaume, K. Saito, S. Shanab, M. Shuptar, S. Stark, D.R. Victory, J. Wei, J.D. Wenstrom, M. Xu, Y. Xu, Y. Yamazaki
    FRIB, East Lansing, Michigan, USA
  • A. Facco
    INFN/LNL, Legnaro (PD), Italy
  • K. Hosoyama
    KEK, Ibaraki, Japan
  • M.P. Kelly
    ANL, Argonne, Illinois, USA
  • R.E. Laxdal
    TRIUMF, Vancouver, Canada
  • M. Wiseman
    JLab, Newport News, Virginia, USA
  
  Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The Facility for Rare Isotope Beams (FRIB), under construction at Michigan State University, will utilize a driver linac to accelerate stable ion beams from protons to uranium up to energies of >200 MeV per nucleon with a beam power of up to 400 kW. The FRIB linac consists of 46 cryomodules containing a total of 324 superconducting radio-frequency (SRF) resonators and 69 superconducting solenoids. The design of all six type cryomodules has been completed. The critical SRF components are tested as subsystem and validated in the pre-production cryomodules. The mass production of SRF cryomodules is underway. Here we report on the progress of the technical construction of FRIB superconducting linac. 		 
slides icon Slides TUXAA03 [4.006 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUXAA03  
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TUPB005 Developed Spoke Cavity Module for Main Linac of China ADS HOM Simulations and Damping Scheme for CEPC Cavities cavity, ion, SRF, niobium 393
 
  • Z.Q. Li, J.S. Cao, Y.L. Chi, F.S. He, S.P. Li, H.Y. Lin, Q. Ma, Z.H. Mi, W.M. Pan, P. Sha, B. Xu, J.Y. Zhai, X.Y. Zhang
    IHEP, Beijing, People's Republic of China
  
  During past five year, two kind of spoke of Beta equal 0.21 and 0.40 were developed at IHEP CAS, the spoke cavity of beta 0.21 was adopted to accelerate proton from 10 to 32MeV, and 32 to 160MeV for beta 0.40 spoke cavity. Up to now, two kind of naked spoke cavities have been test in vertical, also the module of beta 0.21 spoke cavity, which equipped the liquid helium jacket, magnetic shield layer and frequency tuner has been fulfilled and test, the performance of all of components reach the design requirements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB005  
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TUPB022 First Measurements of the Next SC CH-cavities for the New Superconducting CW Heavy Ion Linac at GSI ion, cavity, heavy-ion, status 433
 
  • M. Basten, M. Busch, H. Podlech, M. Schwarz
    IAP, Frankfurt am Main, Germany
  • K. Aulenbacher, W.A. Barth, F.D. Dziuba, V. Gettmann, T. Kürzeder, M. Miski-Oglu
    HIM, Mainz, Germany
  • W.A. Barth, M. Heilmann, S. Yaramyshev
    GSI, Darmstadt, Germany
  • W.A. Barth, S. Yaramyshev
    MEPhI, Moscow, Russia
  
  In the future the existing GSI-UNILAC (Universal Linear Accelerator) will primarily be used to provide high power heavy ion beams at a low repetition rate for the FAIR project (Facility for Antiproton and Ion Research). To keep the ambitious Super Heavy Element (SHE) physics program at GSI competitive a superconducting (sc) continuous wave (cw) high intensity heavy ion LINAC is highly desirable to provide ion beams at or above the coulomb barrier [*]. The fundamental linac design composes a high performance ion source, a new low energy beam transport line, the High Charge State Injector (HLI) upgraded for cw, and a matching line (1.4 MeV/u) followed by the new sc-DTL LINAC for acceleration up to 7.3 MeV/u. The construction of the first demonstrator section has been finished in the 3rd quarter of 2016. It comprises the first crossbar-H-mode (CH) cavity with two sc 9.3 T solenoids and has been successfully tested in the end of 2016 [**]. Currently the next two sc 8 gap CH-cavities are under construction at Research Instruments (RI). First intermediate measurements during the fabrication process as well as the latest status of the construction phase will be presented.
*W. Barth et al., Further R&D for a new Superconducting cw Heavy Ion LINAC@GSI, IPAC2014, THPME004
**F. Dziuba et al., First cold tests of the superconducting cw demonstrator at GSI, RuPAC2016, WECBMH01 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB022  
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TUPB023 Further Tests on the SC 325 MHz CH-cavity and Power Coupler Test Setup ion, cavity, SRF, pick-up 437
 
  • M. Busch, M. Basten, H. Podlech, U. Ratzinger, M. Schwarz
    IAP, Frankfurt am Main, Germany
  • W.A. Barth
    MEPhI, Moscow, Russia
  • W.A. Barth
    GSI, Darmstadt, Germany
  • W.A. Barth, F.D. Dziuba, V. Gettmann
    HIM, Mainz, Germany
  
  Funding: Work supported by BMBF contr. No. 05P15RFRBA
The 325MHz CH-cavity which has been developed and successfully vertically tested at the Institute for Applied Physics, Frankfurt, has has been welded to the helium vessel at the frontal joints of the cavity and further vertical and horizontal tests are in preparation. Finally a beam test with a 11.4 AMeV, 10 mA ion beam at GSI, Darmstadt is projected. Furthermore a newly developed, dedicated test stand for the 217 MHz power couplers has been set up for the cavities of the sc cw-LINAC project at GSI. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB023  
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TUPB024 Performance Tests of the Superconducting 217 MHz CH Cavity for the CW Demonstrator ion, cavity, heavy-ion, operation 440
 
  • F.D. Dziuba, M. Amberg, K. Aulenbacher, W.A. Barth, V. Gettmann, M. Miski-Oglu
    HIM, Mainz, Germany
  • M. Amberg, M. Basten, M. Busch, H. Podlech, M. Schwarz
    IAP, Frankfurt am Main, Germany
  • K. Aulenbacher
    IKP, Mainz, Germany
  • W.A. Barth, M. Heilmann, A. Schnase, S. Yaramyshev
    GSI, Darmstadt, Germany
  • W.A. Barth, S. Yaramyshev
    MEPhI, Moscow, Russia
  
  Regarding the future research program of super heavy element (SHE) synthesis at GSI, high intense heavy ion beams above the coulomb barrier and high average particle currents are highly demanded. The associated beam requirements exceed the capabilities of the existing Universal Linear Accelerator (UNILAC). Besides the existing GSI accelerator chain will be exclusively used as an injector for FAIR (Facility for Antiproton and Ion Research) providing high power heavy ion beams at a low repetition rate. As a consequence a new dedicated superconducting (sc) continuous wave (cw) linac is highly demanded to keep the SHE research program at GSI competitive on a high level. In this context the construction of the first linac section, which serves simultaneously as a prototype to demonstrate its reliable operability has been finished at the end of 2016. The so called demonstrator cryomodule comprises two sc 9.3 T solenoids and a sc 217 MHz crossbar-H-mode (CH) cavity with 15 equidistant accelerating gaps. Furthermore, the performance of the cavity has been successfully tested at cryogenic temperatures. The results of these tests are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB024  
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TUPB040 Design and Optimization of Medium and High Beta Superconducting Elliptical Cavities for the CW Linac in CIADS cavity, ion, HOM, multipactoring 478
 
  • Y.L. Huang, L. Chen, Y. He, Y.M. Li, S.H. Zhang
    IMP/CAS, Lanzhou, People's Republic of China
  
  Superconducting technology is adopted in the main accelerating section of the CW Linac in China Initiative Accelerator Driven System (CIADS) to accelerate the 10 mA proton beam from 2.1 MeV up to 1.5 GeV. The high energy section of the superconducting linac is composed of two families of SC elliptical cavities with optimum beta 0.62 and 0.82 for the acceleration of proton beam from 178 MeV to 1.5 GeV. In this paper, the design and optimization of the 650 MHz medium and high beta elliptical cavities are discussed, including the RF design, multipacting analysis, high order modes (HOMs) analysis, generator RF power calculation, and the mechanical design.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB040  
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TUPB041 Design of a Triple Spoke Cavity for the HIF Demo Injector ion, cavity, heavy-ion, simulation 481
 
  • W. Ma, L. Lu, L. Yang
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: This work was supported by National Nature Science Foundation of China under Grant No. 11475232 and No. 11535016.
A 325 MHz triple spoke type superconducting cavity for lead beams with β=0.3 is designed for the heavy ion inertial fusion (HIF) Demo facility. The design and simulations of the triple spoke will be reported in this paper, including the electromagnetic (EM) design and mechanical study using CST microwave studio (MWS) and ANSYS workbench. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB041  
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TUPB049 Design Study on the Superconducting HWR for Secondary Particle Generation at KOMAC ion, cavity, proton, SRF 499
 
  • H.S. Kim
    KAERI, Daejon, Republic of Korea
  • Y.-S. Cho, J.J. Dang, H.S. Jeong, H.-J. Kwon, S. Lee
    Korea Atomic Energy Research Institute (KAERI), Gyeongbuk, Republic of Korea
  
  Funding: This work has been supported through KOMAC (Korea of Multi-purpose Accelerator Complex) operation fund of KAERI by MSIP (Ministry of Science, ICT and Future Planning).
A 100-MeV proton linac has been operated since 2013 at KOMAC (Korea Multi-purpose Accelerator Complex) and provides the accelerated proton beam to various users from the research institutes, universities and industries. To expand the utilization fields of the accelerator, we have a plan to develop a secondary particle utilization facility including a pulsed neutron source and radio-isotope beam based on the 100-MeV linac. According to the preliminary analysis, the neutron yields can be increased by about 2.5 times if the incident proton beam energy increases from 100 MeV to 160 MeV. Therefore, we carried out design study on the SRF linac based on half-wave resonator to increase the proton beam energy. Baseline design parameters include 350 MHz operating frequency, 2 K operation temperature, and peak electric field and magnetic field less than 35 MV/m and 70 mT, respectively. The available space at existing accelerator tunnel was also taken into consideration. Details on the design study on the SRF linac based on HWR cavity for the secondary particle utilization facility at KOMAC will be given in this presentation. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB049  
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TUPB063 Fabrication of a SRF Deflecting Cavity for the ARIEL-Linac ion, cavity, niobium, TRIUMF 524
 
  • D.W. Storey, R.E. Laxdal, B. Matheson, N. Muller
    TRIUMF, Vancouver, Canada
  • D.W. Storey
    Victoria University, Victoria, B.C., Canada
  
  A superconducting RF deflecting cavity has been designed and is being fabricated at TRIUMF to allow simultaneous beam delivery to both rare isotope production and an energy recovery linac. The 650 MHz cavity will operate in a TE-like mode in CW. The design has been optimised for high shunt impedance and minimal longitudinal footprint, reaching roughly 50% higher shunt impedance with 50% less length than comparable non-TM mode cavity geometries. Due to low power dissipation at 4K at the maximum required deflecting voltage of 0.6 MV, low cost manufacturing techniques have been employed in the construction of the cavity. These include the use of reactor grade Niobium and TIG welding in an inert atmosphere. Development of the manufacturing processes will be presented along with the status of fabrication.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB063  
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TUPB064 Operating Experience on Cavity Performance of ISAC-II Superconducting Heavy Ion Linac ion, cavity, ISAC, operation 527
 
  • Z.Y. Yao, T. Junginger, A.N. Koveshnikov, R.E. Laxdal, Y. Ma, D.W. Storey, E. Thoeng, B.S. Waraich, V. Zvyagintsev
    TRIUMF, Vancouver, Canada
  
  ISAC-II is a superconducting heavy ion linac with 40 QWRs as an extension of ISAC facility for ISOL based on radioactive ion beam production and acceleration. Phase-I with twenty 106MHz cavities has been operating since 2006. The design spec was achieved with the completion of Phase-II with another twenty 141MHz cavities in 2010. The cavity performance statistics and operating experience have been accumulated over years. This paper will summarize the operating experience on cavity performance of ISAC-II.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB064  
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TUPB073 Vertical Electro-polishing Collaboration Between Cornell, KEK, and Marui Galvanizing Co. Ltd cathode, cavity, ion, SRF 563
 
  • F. Furuta, M. Ge, T. Gruber, J.J. Kaufman, M. Liepe, J. Sears
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • V. Chouhan, Y.I. Ida, K.N. Nii, T.Y. Yamaguchi
    MGH, Hyogo-ken, Japan
  • H. Hayano, S. Kato, T. Saeki
    KEK, Ibaraki, Japan
  
  Cornell's SRF group, KEK, and Marui Galvanizing Co. Ltd (MGI) have collaborated since 2014 on Vertical Electro-Polishing (VEP) R&D as a part of a US/Japan Program for Cooperation in High Energy Physics. We have focused on an improvement of removal uniformity during the VEP process. MGI and KEK have developed their original VEP cathode named i-cathode Ninja®, which has four retractable wing-shape parts per cell. Cornell processed one single cell cavity with VEP using this cathode and performed a vertical test. KEK also provided one 9-cell cavity to Cornell. Cornell then performed surface treatments including Cornell VEP and RF test on this 9-cell cavity. The progress by the VEP collaboration and RF test results are presented in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB073  
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TUPB090 Investigation of High Temperature Baking of Jacketed Quarter Wave Resonators ion, cavity, niobium, SRF 598
 
  • A. Rai, D. Kanjilal, K.K. Mistri, P. Patra, P.N. Potukuchi, S.K. Sonti
    IUAC, New Delhi, India
  
  The Superconducting booster Linac at IUAC has been delivering accelerated beams for scheduled experiments since 2013. It has three accelerating modules with 8 Quarter Wave Resonators (QWR)in each. The QWRs for the first module were built at Argonne National Laboratory while those for the second and third modules have been built in-house. During the electropolishing of one of the indigenously built resonators (QWR # I03) the RF surface got spoiled due to a wrong acid mixture that was being used for etching. In subsequent cold tests of the cavity, its performance was poor (2.6 MV/m @ 4W). There was evidence of Q disease also, as the performance deteriorated further (~20%) when the cavity was held at 100-120K for ~8 hours .In an attempt to recover the cavity it was baked at 650 °C for 10 hours along with its stainless steel jacket. A series of tests were conducted thereafter wherein, a substantial improvement (factor of two) in the performance was observed. Encouraged with the results another QWR designed for a lower beta (β=0.05) was also heat treated identically. This paper presents the different treatments followed to enhance the cavity performance vis-à-vis the test results.  
poster icon Poster TUPB090 [1.240 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB090  
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TUPB106 Standardized Beamline Particulate Characterization Analysis: Initial Application to CEBAF and LCLS-II Cryomodule Components ion, cavity, SRF, cryomodule 647
 
  • C.E. Reece, J.K. Spradlin, O. Trofimova, A-M. Valente-Feliciano
    JLab, Newport News, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177
Despite continuously evolving efforts to minimize particulates in operational SRF accelerator systems, the presence of electron field emission from contaminating particulates on SRF surfaces with high surface electric fields remains a challenge. Jefferson Lab has recently initiated a standardized particulate sampling and characterization practice in order to gain more systematic knowledge of the particulates actually present. It is expected that patterns that emerge from such sampling will strengthen source attribution and guide improvement efforts. Initial samples were gathered from a cryomodule and adjoining warm girders removed from the CEBAF tunnel for reprocessing. The collection and analysis techniques were also used to characterize particulates on the inside of LCLS-II string components. Samples are transferred to clean industry-standard forensic GSR carbon tape spindles and examined via automated cleanroom SEM scanning for particle localization and sizing. The particulates are subsequently analyzed with EDS for elemental composition. A catalogue of particle types is being accumulated. The methods used and results obtained from these initial applications will be presented. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB106  
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WEYA02 Construction and Performance Tests of Prototype Quarter-wave Resonator and Its Cryomodule at RIKEN ion, cavity, cryomodule, multipactoring 681
 
  • N. Sakamoto, O. Kamigaito, H. Okuno, K. Ozeki, K. Suda, Y. Watanabe, K. Yamada
    RIKEN Nishina Center, Wako, Japan
  • H. Hara, K. Sennyu, T. Yanagisawa
    MHI-MS, Kobe, Japan
  • E. Kako, H. Nakai, K. Umemori
    KEK, Ibaraki, Japan
  • K. Okihira
    MHI, Hiroshima, Japan
  
  Funding: This research work was funded by ImPACT Program of Council for Science, Technology and Innovation (Cabinet Office, Government of Japan).
This paper describes the development of a superconduct- ing quarter-wave resonator for use in an intense low-β-ion linear accelerator. The prototype cavity was fabricated from bulk Nb, inner cavity surface processing was per- formed, and vertical testing was carried out. In the vertical test, a Q-value of 8.7·108 was obtained with an operating field gradient of 4.5 MV/m at a frequency of 75.5 MHz. Here, we describe the results of the performance tests and various phenomena we experienced during the tests. After the vertical tests, the helium vessel was assembled and the prototype resonator was integrated into a cryomodule. Initial cooldown testing results are described. Performance testing of the cryomodule is continuing. The situation of upgrade of the RIKEN heavy-ion RIKEN Linac (RILAC) is also reported. 		 
slides icon Slides WEYA02 [7.751 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-WEYA02  
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WEYA03 A Seamless Quarter-wave Resonator for HIE-ISOLDE ion, cavity, ISOL, cryomodule 686
 
  • S. Teixeira Lopez, M.A. Fraser, M. Garlaschè, T. Mikkola, A. Miyazaki, A. Sublet, W. Venturini Delsolaro
    CERN, Geneva, Switzerland
  
  The superconducting linac booster for the HIE ISOLDE project, in operation at CERN, is based on NB/Cu coated Quarter Wave Resonators. The performance of the series cavities has been limited by defects in the copper substrates close to the EB weld. A novel cavity design has been developed and prototyped, in order to make it possible manufacturing of the resonators by machining them from the bulk, without any weld. The RF design was optimized for the customary figures of merit, and fully integrated in the HIE ISOLDE cryomodule. Mechanical tolerances were assessed in relation to the available range of pre tuning, and demonstrated on a dummy prototype. Beam dynamics simulations were carried out to check the effects on the beams when the new cavities will be installed in the high energy end of the linac. The presentation will cover the design and the first experimental results of the first Nb/Cu seamless QWR for HIE ISOLDE.  
slides icon Slides WEYA03 [5.262 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-WEYA03  
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THYA01 Performance Testing of FRIB Early Series Cryomodules ion, cavity, cryomodule, SRF 715
 
  • J.T. Popielarski, C. Compton, A. Ganshyn, W. Hartung, D. Luo, S.J. Miller, D.G. Morris, P.N. Ostroumov, L. Popielarski, K. Saito, S. Shanab, S. Stark, T. Xu, S. Zhao, Z. Zheng
    FRIB, East Lansing, USA
  
  Funding: U.S. Department of Energy Office of Science under Cooperative Agreement DE SC0000661.
Construction of a new accelerator for nuclear physics research, the Facility for Rare Isotope Beams (FRIB), is underway at Michigan State University (MSU). The FRIB linac will use superconducting resonators at an operating temperature of 2 K to accelerate ions to 200 MeV per nucleon. The linac requires 106 quarter wave resonators (80.5 MHz, β = 0.043 and 0.086) and 248 half wave resonators (322 MHz, β = 0.29 and 0.54), all made from sheet Nb. Production resonators being delivered to MSU by cavity vendors. At MSU, the resonators are etched, rinsed, and tested in MSU's certification test facility. Certification testing is done before the installation of the high-power input coupler and the tuner. After certification, the resonators are tested in the cryomodule before installation into the FRIB tunnel. The cryomodule test goals are to verify integrated operation of the resonators, RF couplers, tuners, RF controls, and superconducting solenoids. To date, 10 cryomodules out of 48 have been fabricated, and 8 of the cryomodules have been certified. Cryomodule test results are presented in this paper. 		 
slides icon Slides THYA01 [31.165 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THYA01  
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THYA06 Long-term Operation Experience with Beams in Compact ERL Cryomodules ion, cavity, operation, cryomodule 736
 
  • K. Umemori, M. Egi, K. Enami, T. Furuya, Y. Honda, E. Kako, T. Konomi, H. Sakai
    KEK, Ibaraki, Japan
  • T. Okada
    Sokendai, Ibaraki, Japan
  • M. Sawamura
    QST, Tokai, Japan
  
  Compact ERL (cERL) was constructed at KEK as a prototype for 3GeV ERL light source. It consists of two types of SRF cavities. Three injector 2-cell SRF cavities and two main linac 9-cell SRF cavities. The beam operation started at 2013, with 100 nA (CW). Beam current increased step by step and currently reached to 1 mA (CW). Energy recovery has successfully achieved. Performance of the SRF cavities through long term beam operation has been investigated. With the beam induced HOMs, the beam position and the beam timing were studied. cERL has suffered from heavy field emissions in operation. Field emissions of the main linac cavity started just after module assembly work, and during beam operation, performances of both the main linac and the injector SRF cavities sometimes degraded. One reason of degradation was discharges occurred at beamline components due to charge up of electrons. Pulse aging technique helped to recover SRF performances. In this presentation, details of SRF beam operation, degradation, applied recovery methods are described.  
slides icon Slides THYA06 [4.973 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THYA06  
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THPB035 High Power Testing of the First ESS SPOKE Cavity Package ion, cavity, controls, accelerating-gradient 817
 
  • H. Li, A.K. Bhattacharyya, L. Hermansson, M. Jobs, R.J.M.Y. Ruber, R. Santiago Kern
    Uppsala University, Uppsala, Sweden
  
  The first double spoke cavity for the ESS project was tested with high power in the HNOSS cryostat at the FREIA Laboratory. This cavity is designed for 325.21MHz, pulsed mode with 14 Hz repetition rate, up to a peak power of 360 kW. The qualification of the cavity package in a horizontal test, involving a superconducting spoke cavity, a fundamental power coupler (FPC), LLRF system and RF station, represents an important verification before the module assembly. This paper presents the test configuration, RF conditioning history and first high power performance of this cavity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB035  
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THPB043 Effects of Chemical Treatments on the Surface Roughess and Surface Magnetic Field Ehancement of Niobium-3 Tin Films for Superconducting Radio-Frequency Cavities ion, cavity, niobium, SRF 848
 
  • R.D. Porter, F. Furuta, D.L. Hall, M. Liepe, J.T. Maniscalco
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  Current niobium-3 tin (Nb3Sn) films produced via vapor diffusion have rougher surfaces than typical electropolished niobium surfaces causing significantly enhancement of the surface magnetic fields. Reducing surface roughness of Nb3Sn surfaces may be necessary to achieve higher gradient accelerator cavities with high Q. Previous work at Cornell has shown the impact of several chemical treatments on the surface roughness of Nb3Sn films; however, it had not been evaluated how the changes in surface roughness impact the surface magnetic field enhancement. In this paper we present simulations of the surface field enhancement of oxipolished Nb3Sn, which was shown to be effective at reducing the surface roughness of Nb3Sn. The surface magnetic field enhancement data is compared to those of unetched Nb3Sn to find that the surface magnetic field enhancement (and surface roughness) has been roughly halved.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB043  
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THPB066 Introducing the Vertical High-temperature UHV Furnace of the S-DALINAC for Future Cavity Material Studies ion, niobium, vacuum, cavity 891
 
  • R. Grewe, L. Alff, M. Arnold, J. Conrad, S. Flege, M. Major, N. Pietralla
    TU Darmstadt, Darmstadt, Germany
  • F. Hug
    IKP, Mainz, Germany
  
  Funding: Work supported by the Federal Ministry of Education and Research through grant No. 05H15RDRBA.
Since 2005 the Institute for Nuclear Physics in Darmstadt operates a high temperature UHV furnace for temperatures of up to 1750°C. It has been used several times for hydrogen bake-out of the SRF cavities of the S-DALINAC with proven success. In 2013, studies at FNAL have shown that cavities treated with nitrogen reached an up to four times higher q-factor*. The cavities are exposed to N2 at 850°C at the end of the H2 bake-out. A thin layer of normalconducting hexagonal niobium nitride (NbN) forms at the surface which is removed by electropolishing while the higher quality factors are attributed to the N2 diffusion into the bulk Nb. At temperatures from 1300°C to 1700°C a thin layer of the superconducting cubic phase of NbN can be observed, e.g. delta-phase NbN**, which has a higher critical field and higher critical temperature and thus is very intereresting for applications for SRF cavities***. The UHV furnace has been prepared for future treatments of Nb samples and cavities in a N2 atmosphere at high temperatures for research on cubic NbN. The material properties of the samples will be analyzed at the ATFT group at the Department for Material Sciences of TU Darmstadt.
*Grasselino et al., Superconducting Science and Technology, 2013
**Hennessey et al., Oxidation of Metals, 1992
***Martienssen et al., Springer Handbook of Condensed Matter and Materials Data, 2005 		 
poster icon Poster THPB066 [3.024 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THPB066  
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FRXAA01 Production Status of Superconducting Cryomodules for the Facility for Rare Isotope Beams cryomodule, ion, cavity, vacuum 928
 
  • C. Compton, H. Ao, J. Asciutto, B. Bird, W. Hartung, S.J. Miller, J.T. Popielarski, L. Popielarski, M.A. Reaume, K. Saito, M. Shuptar, S. Stark, B.P. Tousignant, T. Xu
    FRIB, East Lansing, USA
  
  The Facility for Rare Isotope Beams (FRIB) is an SRF accelerator project in full production at Michigan State University (MSU). With the civil construction nearly complete, the installation of accelerator equipment into the tunnel has taken center stage. A total of 46 superconducting cryomodules are needed for the FRIB linac to reach 200 MeV per nucleon. The linac consist of four cavity types (β = 0.041, 0.085, 0.29, and 0.53) and 6 different cryomodule designs. Cryomodule assembly is done in 5 parallel bays, each one compatible with every cryomodule type. Completed cryomodules undergo full system testing in bunkers before being accepted and delivered to the tunnel. The current status of the cryomodule assembly effort will be presented, including lessons learned and overall experience to date.  
slides icon Slides FRXAA01 [9.990 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-FRXAA01  
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FRXAA02 High-efficiency, High-current Optimized Main-linac ERL Cryomodule ion, cavity, cryomodule, HOM 935
 
  • F. Furuta, N. Banerjee, A.C. Bartnik, J. Dobbins, R.G. Eichhorn, M. Ge, G.H. Hoffstaetter, M. Liepe, P. Quigley, D.M. Sabol, J. Sears, E.N. Smith, V. Veshcherevich
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  
  The Main Linac Cryomodule (MLC) prototype is a key component of the Cornell-BNL ERL Test Accelerator (CBETA) project, which is a 4-turn FFAG ERL currently under construction at Cornell University. This novel cryomodule is the first SRF module ever to be fully optimized simultaneously for high efficient SRF cavity operation and for supporting very high CW beam currents. After a successful initial MLC testing, the MLC has now been moved into its final location for the CBETA ring. For a first beam test of the MLC and CBETA, the Cornell ERL high voltage DC gun and SRF injector cryomodule were connected to MLC via an entry beam line; a beam stop assembly was also installed at the exit line. In this paper, we summarize the performance of this novel ERL cryomodule including the results of the first beam test and the additional tests focused on RF field stability and cavity microphonics.  
slides icon Slides FRXAA02 [8.792 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-FRXAA02  
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