Keyword: cryomodule
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MOXA03 The 30MeV Stage of the ARIEL e-linac ion, cavity, linac, 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.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOXA03  
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MOXA07 Development of the C-ADS SRF Accelerator at IHEP ion, cavity, linac, 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 		 
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MOYA01 The Superconducting Accelerator for the ESS Project ion, cavity, SRF, linac 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.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOYA01  
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MOYA03 Progress of the RAON ion, cavity, quadrupole, rfq 36
 
  • D. Jeon, B.H. Choi, C. Choi, J.W. Choi, C.O. Choi, S. Choi, I. Chun, I.S. Hong, M.O. Hyun, H. Jang, H.M. Jang, J.-H. Jang, S.C. Jeong, H. Jin, Y.W. Jo, J. Joo, M.J. Joung, H.C. Jung, I.I. Jung, Y. Jung, J. Kang, D.G. Kim, H. Kim, H.J. Kim, J.H. Kim, J.-W. Kim, W.K. Kim, Y. Kim, Y.K. Kwon, D.Y. Lee, J. Lee, K.W. Lee, M. Lee, S. Lee, S. Lee, S.H. Nam, B.-S. Park, M.J. Park, K.T. Seol, I. Shin, J.H. Shin, C.W. Son, K.T. Son, S.W. Yoon, A. Zaghloul
    IBS, Daejeon, Republic of Korea
  
  Funding: This work was supported by the Institute for Basic Science funded by the Ministry of Science, ICT and Future Planning (MSIP) and the National Research Foundation (NRF) under Contract 2013M7A1A1075764
Construction of the RAON heavy ion accelerator facility is in-progress in Korea. The driver linac is a superconducting linac with 200 MeV/u for uranium beam and 400 kW beam power. Prototyping of major components and their tests are proceeding including superconducting cavities, superconducting magnets and cryomodules. December 2016, the RFQ accelerated oxygen beam. Status report of the RAON accelerator systems is presented. 		 
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOYA03  
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MOPB010 Design of the 2×4-cell Superconducting Cryomodule for the Free-electron Laser ion, shielding, cavity, radiation 67
 
  • X. Luo, C.L. Lao, M. Li, L.J. Shan, X.M. Shen, H. Wang, X. Yang, K. Zhou
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
  • X.Y. Lu, S.W. Quan, F. Wang
    PKU, Beijing, People's Republic of China
  
  A 2×4-cell superconducting linac module for the THz-FEL facility has been developed at the China Academy of Engineering Physics, which is expected to provide 6~8 MeV quasi-CW electron beams with an average current of 1~5 mA. The design of the cryomodule is presented in this paper. The dynamic and static heat load have been evaluated to reasonable level. The temperature distribution inside the cryomodule has been optimized by simulation, as well as mechanical structure and the magnetic shielding.  
poster icon Poster MOPB010 [1.019 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB010  
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MOPB011 CEA Cryomodules Design for SARAF Phase 2 ion, cavity, simulation, vacuum 70
 
  • C. Madec
    CEA, Gif-sur-Yvette, France
  • N. Bazin, D. Chirpaz-Cerbat, R. Cubizolles
    CEA/IRFU, Gif-sur-Yvette, France
  • P. Brédy
    CEA/DSM/IRFU, France
  • R. Bruce, P. Hardy, F. Leseigneur, Th. Plaisant, J. Plouin
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  
  CEA is committed to delivering a Medium Energy Beam Transfer line and a superconducting linac (SCL) for SARAF accelerator in order to accelerate 5mA beam of either protons from 1.3 MeV to 35 MeV or deuterons from 2.6 MeV to 40.1 MeV. The SCL consists in 4 cryomodules separated by warm diagnostics housing beam diagnostics. The first two identical cryomodules host 6 half-wave resonator (HWR) low beta cavities (β = 0.091), 176 MHz. The last two identical cryomodules are equipped with 7 HWR high-beta cavities (β = 0.181), 176 MHz. The beam is focused through superconducting solenoids located between cavities housing steering coils. A Beam Position Monitor is placed upstream each solenoid. A diagnostic box containing a beam profiler and a vacuum pump will be placed at the end of each cryomodule. The cryomodules and the warm sections are being designed. These studies will be presented in this poster.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB011  
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MOPB012 Status of the IFMIF LIPAc SRF Linac ion, cavity, SRF, operation 74
 
  • N. Bazin, C. Boulch, A. Bruniquel, P. Carbonnier, J.K. Chambrillon, G. Devanz, F. Éozénou, P. Hardy, H. Jenhani, O. Piquet, J. Plouin, A. Riquelme, D. Roudier, C. Servouin
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  • P. Charon, S. Chel, G. Disset, L. Maurice, J. Relland, B. Renard
    CEA/IRFU, Gif-sur-Yvette, France
  • P. Contrepois
    CEA/DSM/IRFU, France
  • D. Regidor, F. Toral
    CIEMAT, Madrid, Spain
  
  The IFMIF accelerator aims to provide an accelerator-based D-Li neutron source to produce high intensity high energy neutron flux to test samples as possible candidate materials to a full lifetime of fusion energy reactors. A prototype of the low energy part of the accelerator is under construction at Rokkasho in Japan. It includes one cryomodule containing 8 half-wave resonators (HWR) operating at 175 MHz and eight focusing solenoids. This paper presents the status of the IFMIF SRF Linac.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB012  
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MOPB018 Testing of SRF Cavities and Cryomodules for the European Spallation Source ion, cavity, SRF, linac 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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MOPB019 Interface Challenges for the SRF Cryomodules for the European Spallation Source ion, cavity, interface, ion-source 100
 
  • F. Schlander, C. Darve, N. Elias, C.G. Maiano
    ESS, Lund, Sweden
  • P. Bosland
    CEA/DSM/IRFU, France
  • G. Olry
    IPN, Orsay, France
  
  The European Spallation Source is currently under construction in Lund in southern Sweden. The main part of the accelerator will consist of two different types of cryomodules housing three different types of cavities ' double spoke cavities and two different elliptical cavities. The spoke cavities as well as the cryomodules will be provided by IPN Orsay, thus the external interfaces to the other accelerator systems have to be verified. While the procurement and assembly of the elliptical cryomodules will be performed by CEA Saclay, the cavities will be provided by INFN Milano and STFC Daresbury. Thus in addition to the external cryomodule interfaces, also the internal interfaces between cavities and cryomodules have to be taken care of. This contribution presents the challenges related to this work.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB019  
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MOPB031 Fabrication and Cold Test Result of FRIB β=0.53 Pre-production Cryomodule ion, cavity, solenoid, SRF 120
 
  • H. Ao, J. Asciutto, B. Bird, N.K. Bultman, E.E. Burkhardt, F. Casagrande, C. Compton, K.D. Davidson, K. Elliott, A. Ganshyn, I. Grender, W. Hartung, L. Hodges, I.M. Malloch, S.J. Miller, D.G. Morris, P.N. Ostroumov, J.T. Popielarski, L. Popielarski, M.A. Reaume, K. Saito, M. Shuptar, S. Stark, J.D. Wenstrom, M. Xu, T. Xu, Z. Zheng
    FRIB, East Lansing, USA
  • A. Facco
    INFN/LNL, Legnaro (PD), Italy
  
  Funding: Work supported by the U.S. Department of Energy Office of Science under Cooperative Agreement DE-SC0000661
The driver linac for the Facility for Rare Isotope Beams (FRIB) comprises four kinds of cavities (β=0.041, 0.085, 0.29, and 0.53) and six types of cryomodules including matching modules. FRIB has completed the fabrication and the cold test of a β=0.53 pre-production cryomodule, which is the first prototype for a half-wave (β=0.29 and 0.53) cavity. This paper describes the fabrication and the cold test result of the β=0.53 pre-production cryomodule including lessons learned. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB031  
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MOPB037 Progress of the 2x4-Cell Superconducting Accelerator for the CAEP THz-FEL Facility ion, cavity, pick-up, cryogenics 134
 
  • K. Zhou, C.L. Lao, M. Li, X. Luo, L.J. Shan, X. Shen, H. Wang, X. Yang
    CAEP/IAE, Mianyang, Sichuan, People's Republic of China
  • X.Y. Lu
    PKU, Beijing, People's Republic of China
  
  The high average power THz radiation facility is now under construction in China Academy of Engineering Physics. The superconducting accelerator is one of the most important components for this facility, including two 4-Cell TESLA superconducting radio frequency cavities. The designed effective field gradients for both cavities are 10-12 MV/m. This paper will present the progress of the 2x4-cell superconducting accelerator, mainly including its construction and cryogenic test in Chengdu. At 2 K state, the cryomodule works smoothly and stably. The effective field gradients of both cavities have achieved 10 MV/m. Further beam loading experiments are now in progress.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB037  
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MOPB042 The TRIUMF/VECC Injector Cryomodule Performance ion, cavity, TRIUMF, linac 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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MOPB043 Pansophy, a JLab SRF Engineering Data Management System, Supporting Data Collection, Retrieval and Analysis Utilized by LCLS-II ion, cavity, database, status 148
 
  • V.D. Bookwalter, M. Dickey, E.A. McEwen, M.G. Salvador
    JLab, Newport News, Virginia, USA
  
  Pansophy is an Engineering Data Management System that provides a comprehensive solution for managing information in the production and testing of cryomodules. It is especially suited to supporting the Data & Quality Management Systems for large projects like LCLS-II. With extensive amounts of data collected for an individual project, data retrieval to facilitate feedback and enhancement of production and processing activities is a high priority. The priority shares importance with the needs of managing the project, including production status, NCR, and Quality Management reports. Recent Pansophy enhancements have been to Data and Quality management reports and statistical analysis. Such enhancements include a database driven menu system, extended MSWord macro and preprocessing of travelers, and an extensive reporting system. The reporting system allows managers and group leaders to quickly respond to the needs of the project in areas of cavity and cryomodule production, data collection, NCR, Quality Management and schedule. Extensions include integration with the SRF inventory system PRIMeS, allowing traceability from receiving of manufactured parts to final cryomodule product.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB043  
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MOPB044 Magnetic Hygiene Control on LCLS-II Cryomodules Fabricated at JLab ion, cavity, controls, shielding 153
 
  • G. Cheng, E. Daly, G.K. Davis, J.F. Fischer, N.A. Huque, R.A. Legg, H. Park, K.M. Wilson, L. Zhao
    JLab, Newport News, Virginia, USA
  
  Funding: U.S. DOE Contract No. DE-AC05-06OR23177 and the LCLS-II project.
Jefferson Lab (JLab) is in collaboration with Fermi Na-tional Accelerator Laboratory (Fermilab) to build 18 cryomodules to install at the SLAC National Accelerator Laboratory's tunnel as part of the Linac Coherent Light Source upgrade project (LCLS-II). Each LCLS-II cry-omodule hosts 8 superconducting niobium cavities that adopt the nitrogen doping technique, which aims to en-hance the cavity quality factor Qo to reduce the consumption of liquid helium used to cool down the cavities. It is known that the Qo of niobium cavities is affected by cavity surface magnetic field. Traditionally, magnetic shields made of high magnetic permeability mu-metals are employed as a passive shielding of the ambient magnetic fluxes. During the LCLS-II cryomodule development, magnetic hygiene control that includes magnetic shielding and demagnetization of parts and the whole-machine is implemented. JLab and Fermilab worked closely on developing magnetic hygiene control procedures, identifying relevant tools, investigating causes of magnetization, magnetic field monitoring, etc. This paper focuses on JLab's experiences with LCLS-II cryomodule magnetic hygiene control during its fabrication.
Authored by Jefferson Science Associates, LLC. The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for Government purposes. 		 
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MOPB045 JLab New Injector Cryomodule Design, Fabrication and Testing cavity, ion, cryogenics, HOM 158
 
  • G. Cheng, M.A. Drury, J.F. Fischer, R. Kazimi, K. Macha, H. Wang
    JLab, Newport News, Virginia, USA
  
  Funding: U.S. DOE Contract No. DE-AC05-06OR23177.
A new Injector Cryomodule (INJ CM) aimed to replace the existing Quarter Cryomodule in the CEBAF tunnel has been developed at Jefferson Lab (JLab). It is sched-uled to be first tested in the Cryomodule Test Facility (CMTF) for module performance then the Upgraded Injector Test Facility (UITF) with electron beam. This new cryomodule, hosting a 2-cell and 7-cell cavity, is designed to boost the electron energy from 200 keV to 5 MeV and permit 380 uA - 1.0 mA of beam current. The 2-cell cavity is a new design whereas the 7-cell cavity is refurbished from a low loss cavity from the retired JLab Renascence Cryomodule. The INJ CM adopts quite a few designs from the JLab 12 GeV Upgrade Cryomodule (C100). Examples of this include having the cold mass hung from a spaceframe structure by use of axial and transverse Nitronic rods, cavities to be tuned by scissor-jack style tuners and the end cans are actually modified from C100 style end cans. However, this new INJ CM is not a quarter of the C100 Cryomodule. This paper focuses on the major design features, fabrication and alignment process and testing of the module and its components.
Authored by Jefferson Science Associates, LLC. The U.S. Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce this manuscript for Government purposes. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB045  
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MOPB046 LCLS-II Cryomodule Production at JLab ion, cavity, vacuum, SRF 163
 
  • R.A. Legg, G. Cheng, E. Daly, G.K. Davis, M.A. Drury, J.F. Fischer, T. Hiatt, N.A. Huque, L.K. King, J.P. Preble, A.V. Reilly, M. Stirbet, K.M. Wilson
    JLab, Newport News, Virginia, USA
  
  Funding: This work was supported by the LCLS-II Project and the U.S. Department of Energy, Contract DE-AC02-76SF00515.
The LCLS-II cryomodule construction program leverages the mature XFEL cryomodule design to produce technologically sophisticated cryomodules with a minimum of R&D according to an accelerated manufacturing schedule. Jlab, as one of the partner labs, is producing 18 cryomodules for LCLS-II. To meet the quality and schedule demands of LCLS-II, many upgrades to the JLAB cryomodule assembly infrastructure and techniques have been made. JLab has installed a new cleanroom for string assembly and instituted new protocols to minimize particulate transfer into the cavities during the cryomodule construction process. JLab has also instituted a set of magnetic hygiene protocols to be used during the assembly process to minimize magnetic field impingement on the finished cavity structure. The goal has been to have gradients, both maximum and field emission onset, that do not degrade between the cavity vertical test and final cryomodule qualification, while maximizing the Q0 of each finished cavity. Results from the prototype cryomodule assembly are presented. 		 
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MOPB049 Upgraded Cavities for the CEBAF Cryomodule Rework Program cavity, ion, HOM, GUI 168
 
  • R.A. Rimmer, G. Cheng, G. Ciovati, W.A. Clemens, E. Daly, G.K. Davis, J. Follkie, D. Forehand, F. Fors, J. Guo, J. Henry, K. Macha, F. Marhauser, G.R. Myneni, L. Turlington
    JLab, Newport News, Virginia, USA
  
  Funding: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.
The CEBAF cryomodule rework program has been a successful tool to recover and maintain the energy reach of the original baseline 6 GeV accelerator. The weakest original modules with eight five-cell cavities assembled in four 'pairs', with a specification when new of 20 MV per cryomodule (5 MV/m), are disassembled, re-cleaned with modern techniques and re-qualified to at least 50 MV (12.5 MV/m), (leading to the acronym 'C50'). The cost per recovered MV is much less than building new modules. However over time the stock of weak modules is being used up and the voltage gain per rework cycle is diminishing. In an attempt to increase the gain per cycle it is proposed to rework the cavities by replacing the original accelerating cells with new ones of an improved shape and better material. The original CEBAF HOM and FPC end groups are retained. The goal is to achieve up to 75 MV (18.75 MV/m) for the reworked module ('C75'). We report on the fabrication experience and test results of the first trial pair, containing two such reworked cavities. 		 
poster icon Poster MOPB049 [1.503 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB049  
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MOPB050 Cavity Processing and Testing Activities at Jefferson Lab for LCLS-II Production cavity, ion, SRF, FEL 173
 
  • L. Zhao, G.K. Davis, J. Follkie, D. Forehand, K. Macha, A.D. Palczewski, A.V. Reilly
    JLab, Newport News, Virginia, USA
  
  Funding: Work supported by Jefferson Science Associates, LLC under U.S. DOE Contracts DE-AC05-06OR23177 and DE-AC02-76SF00515 for the LCLS-II Project.
Cryomodule production for LCLS-II is well underway at Jefferson Lab. This paper explains the process flow for production cavities, from being received at the Test Lab to being assembled onto cavity strings. Taking our facility and infrastructure into consideration, process optimization and process control are implemented to ensure high quality products. 		 
poster icon Poster MOPB050 [2.338 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB050  
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MOPB061 Quality Control of Copper Plating in STF-2 Input Power Couplers ion, cavity, vacuum, controls 186
 
  • E. Kako, R. Ueki
    KEK, Ibaraki, Japan
  • K. Hiroaki, J. Taguchi
    Nomura Plating Co, Ltd., Osaka, Japan
  • K. Okihira, K. Sennyu
    MHI, Hiroshima, Japan
  • F. Saito, H. Umezawa
    Tokyo Denkai Co., Ltd., Tokyo, Japan
  • O. Yushiro
    Toshiba Electron Tubes & Devices Co., Ltd, Tokyo, Japan
  
  Purity of thin copper plating using in input power couplers for superconducting cavities is one of important characteristics for considering thermal losses at low temperature. Various samples of thin copper plating on stainless sheets was fabricated by three companies with their own plating techniques. The RRR values of the samples with different thickness of copper plating were compared in the condition before and after heat treatment at 800oC in a brazing furnace. Deterioration of the RRR was observed in all of samples after heat treatment. The results of the RRR measurements and sample analysis of impurities will be reported in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB061  
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MOPB070 The Improvement of the Power Coupler for CADS SC Spoke Cavities ion, cavity, electron, experiment 220
 
  • T.M. Huang, B. Bing, X. Chen, H.Y. Lin, Q. Ma, F. Meng, W.M. Pan, G.W. Wang
    IHEP, Beijing, People's Republic of China
  • K.X. Gu
    Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China
  
  Twenty superconducting spoke cavities mounted in three cryomodules (CM1, CM2 and CM4) were in-stalled in the CADS, a test facility of 10 mA, 25 MeV CW proton linac. Each cavity was equipped with one coaxial type fundamental power coupler (FPC). Fatal window crack was observed during the test cryomod-ule (TCM) commissioning. A series of experiments were subsequently implemented and eventually at-tributed the window crack to the electron bombard-ment from cavity field emission (FE). Improvements covering the coupler cleaning and assembly proce-dure, the structure and position modifications were thus implemented, aiming to reduce the cavity contam-ination and avoid the window damaged by cavity FE electrons. This paper will describe how the coupler window damaged by cavity field emission and the improve-ments for cure. In addition, the performances of FPCs for CM1, CM2 and CM4 were compared.  
poster icon Poster MOPB070 [0.613 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB070  
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MOPB076 Analysis of the Production, Installation and Commissioning of the European-XFEL Frequency Tuners ion, cavity, FEL, controls 235
 
  • R. Paparella, A. Bosotti, D. Sertore
    INFN/LASA, Segrate (MI), Italy
  • C. Albrecht, S. Barbanotti, A. Bellandi, J. Branlard, K. Jensch, L. Lilje
    DESY, Hamburg, Germany
  • C. Cloué, T. Trublet
    CEA/IRFU, Gif-sur-Yvette, France
  • C. Madec
    CEA, Gif-sur-Yvette, France
  
  In the European-XFEL superconducting linac, mechanical frequency tuners equipped with stepper motors and piezoelectric actuators provide cold tuning of each of the 768 1.3 GHz cavities. More than 820 complete tuning systems were fabricated and pre-assembled in industry, tested at several stages before and after assembly and successfully commissioned during cryo-module cold tests at AMTF (DESY). Quality control strategy adopted to preserve the well-assessed tuner reliability through such a large-scale industrial production is critically reviewed and the lessons learned are presented in this paper. The statistical analysis of the large set of data acquired up to the recent commissioning of the entire linac is then summarized.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB076  
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MOPB086 First Results of the IFMIF/EVEDA-SaTHoRI Tests ion, cavity, SRF, controls 262
 
  • O. Piquet, N. Bazin, P. Carbonnier, J.K. Chambrillon, M. Desmons, G. Devanz, H. Jenhani, C. Servouin
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  • P. Cara
    Fusion for Energy, Garching, Germany
  • J.F. Denis, L. Maurice, J. Relland
    CEA/IRFU, Gif-sur-Yvette, France
  • F. Éozénou, P. Hardy, E. Jacques, Y. Lussignol, P. Sahuquet
    CEA/DSM/IRFU, France
  • D. Gex, A. Jokinen, G. Phillips
    F4E, Germany
  • I. Moya, P. Méndez
    CIEMAT, Madrid, Spain
  
  The SaTHoRI test stand (Satellite de Tests Horizontal des Résonateurs IFMIF) aims to characterize a jacketed and fully dressed cavity with its coupler and tuner. A dedicated test cryostat has been manufactured and is connected to an existing horizontal test cryostat which provides the cryogenic coolant. A RF source ' provided by the IFMIF collaboration, one of the four RF sources which will be used for the cryomodule at Rokkasho ' has been installed and commissioned at CEA. This paper describes the test stand and presents the first results.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB086  
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MOPB087 Frequency Tuner Development and Testing at Cornell for the RAON Half-wave-resonator ion, cavity, cryogenics, SRF 266
 
  • M. Ge, F. Furuta, J.E. Gillette, T. Gruber, S.W. Hartman, M. Liepe, T.I. O'Connell, P.J. Pamel, P. Quigley, J. Sears, V. Veshcherevich
    Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
  • B.H. Choi, J. Joo, J.W. Kim, W.K. Kim, J. Lee, I. Shin
    IBS, Daejeon, Republic of Korea
  
  The half-wave-resonators (HWRs) for the RAON project require a slow frequency tuner that can provide >80 kHz tuning range. Cornell University is currently in the process of designing, prototyping, and testing this HWR tuner. In this paper, we present the optimized tuner design, prototype fabrication, test insert preparation, and cryogenic test results. The performance of the tuner is analysed in detail.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB087  
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MOPB090 Sub-micro-Tesla Magnetic Shielding Design for Cryomodules in the High-gradient Program at CERN ion, shielding, cavity, simulation 278
 
  • S. Papadopoulos, L. Dassa, F. Gerigk, F. Pillon, S. Ramberger, P. Yilmazer
    CERN, Geneva, Switzerland
  • J. Dequaire
    Intitek, Lyon, France
  
  In the framework of the High-Gradient R\&D program at CERN a cryomodule, consisting of four superconducting 5-cell cavities, has been designed. In order to reduce flux trapping in the surface of the superconductor and to minimize Q degradation during a quench, highly effective magnetic shielding is needed. The solution proposed includes cold and warm passive shielding enhanced by four compensating coils. In this paper the magneto-static simulation results are presented illustrating different design considerations that led to a final design. Finally the shielding ability of the vacuum vessel is investigated experimentally through ambient magnetic field measurements.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB090  
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MOPB097 Degradation and Recovery of Cavity Performances in Compact-ERL Injector Cryomodule ion, cavity, operation, radiation 289
 
  • E. Kako, T. Konomi, T. Miura, H. Sakai, K. Umemori
    KEK, Ibaraki, Japan
  
  Injector cryomodule for cERL consists of three 2-cell cavities equipped with double-feeds input couplers, five antenna-type HOM couplers and a slide-jack tuner with two piezo actuators. After cryomodule assembly and first cool-down tests in 2012, the cERL injector cryomodule has been stably operated with beam for four years. Gradual increases of x-ray radiation levels due to field emission were observed during long term beam operation. High power pulsed RF conditioning as a cure method was applied in the cool-down period in 2016 and 2017, so that degraded cavity performances have almost recovered up to the original levels. Performance recovery status in three 2-cell cavities will be reported in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB097  
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MOPB099 Design of C-ADS Injector-I Cryomodule for 325MHz Cavities ion, cavity, linac, 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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MOPB101 Cryomodule Fabrication and Modification for High Current Operation at the Mainz Energy Recovering Superconducting Accelerator MESA ion, cavity, operation, experiment 297
 
  • T. Stengler, K. Aulenbacher, F. Hug, D. Simon
    IKP, Mainz, Germany
  • K. Aulenbacher, T. Kürzeder
    HIM, Mainz, Germany
  
  Funding: This work is supported by the German Research Foundation (DFG) under the Cluster of Excellence "PRISMA" EXC 1098/2014}
At Johannes Gutenberg-Universität Mainz, the Institute for Nuclear Physics is currently building the multiturn ERL 'Mainz Energy-Recovering Superconducting Accelerator' MESA. The §I{1.3}{\giga\hertz} cryomodules are based on the ELBE modules at Helmholtz Center Dresden-Rossendorf (HZDR) but are modified to suit the high current, energy recovering purposes of MESA. With two 9-cell TESLA cavities each, they shall provide §I{50}{\mega\electronvolt} energy gain per turn. The design and fabrication was done by Research Instruments GmbH, Bergisch Gladbach, Germany. The current status of the cryomodules, the test set up at the Helmholtz-Institute Mainz, the cavity properties and their tests will be discussed. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB101  
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MOPB102 Preliminary Design on the Cryomodule of the HWR for the Secondary Particle Generation at KOMAC ion, proton, linac, 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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MOPB104 Development of a Novel Supporting System for High Luminosity LHC SRF Crab Cavities ion, cavity, SRF, interface 304
 
  • T.J. Jones
    STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
  • K. Artoos, R. Calaga, O. Capatina, T. Capelli, M. Sosin, J.S. Swieszek, C. Zanoni
    CERN, Geneva, Switzerland
  • G. Burt
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • T.J. Jones
    Lancaster University, Lancaster, United Kingdom
  
  Compact SRF Crab Cavities are integral to the HL-LHC upgrade. This paper details the design of support structures within the SPS (Super Proton Synchrotron) Crab Cavity Cryomodule. For ease of alignment each cavity is supported with the mechanical tuner and RF Fundamental Power Coupler (FPC) via a common support plate. To reduce heat leak and remove bellows in the FPC it was determined that this would be the fixed support for the cavity (V. Parma, 2013). In addition, novel flexural blades were designed to give increased stiffness yet allow for thermal contraction of the cavity towards the fixed point of the FPC. This approach was superior when compared via simulation to several alternative techniques. A detailed simulation model was used for optimisation of directional stiffness, identification of vibration modes and minimising thermal stresses. A transmission matrix was developed in MS Excel to assess modal deflection for given ground vibration conditions. The spreadsheet gives an instantaneous yet comparable result to time consuming random vibration FE Analyses. The final engineering design of the supporting system is now complete and will also be described in this paper.
References
V. Parma, R. B. (2013). Status of the Superconducting Proton Linac (SPL) Cryomodule. SRF2013.
 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB104  
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MOPB105 Thermosiphon Cooling Loops for ARIEL Cryomodules ion, cavity, TRIUMF, linac 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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MOPB106 Test Results of the European XFEL Serial-production Accelerator Modules ion, cavity, FEL, operation 312
 
  • K. Kasprzak, M. Wiencek, A. Zwozniak
    IFJ-PAN, Kraków, Poland
  • D. Kostin, D. Reschke, N. Walker
    DESY, Hamburg, Germany
  
  The serial-production tests of 100 cryomodules for the European XFEL have been finished. In this paper the statistics of the cold RF measurements in the AMTF (Accelerator Module Test Facility) are reported for all the modules. In addition comparison between the cavity vertical test results and module test results are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB106  
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MOPB109 LCLS-II Cryomodule Transport System Testing ion, cavity, vacuum, ISOL 317
 
  • N.A. Huque, E. Daly
    JLab, Newport News, Virginia, USA
  • M.W. McGee
    Fermilab, Batavia, Illinois, USA
  
  The Cryomodules (CM) for the Linear Coherent Light Source II (LCLS-II) will be shipped to SLAC (Menlo Park, California) from JLab (Newport News, Virginia) and FNAL (Batavia, Illinois). A transportation system has been designed and built to safely transport the CMs over the road. It uses an array of helical isolator springs to attenuate shocks on the CM to below 1.5g in all directions. The system rides on trailers equipped with Air-Ride suspension, which attenuates vibration loads. The prototype LCLS-II CM (pCM) was driven 750 miles to test the transport system; shock loggers recorded the shock attenuation on the pCM and vacuum gauges were used to detect any compromises in beamline vacuum. Alignment measurements were taken before and after the trip to check whether cavity positions had shifted beyond the ± 0.2mm spec. Passband frequencies and cavity gradients were measured at 2K at the Cryomodule Test Facility (CMTF) at JLab to identify any degradation of CM performance after transportation. The transport system was found to have safely carried the CM and is cleared to begin shipments from JLab and FNAL to SLAC.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB109  
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MOPB110 Results of Accelerated Life Testing of LCLS-II Cavity Tuner Motor ion, cavity, operation, SRF 323
 
  • N.A. Huque, E. Daly
    JLab, Newport News, Virginia, USA
  • Y.M. Pischalnikov
    Fermilab, Batavia, Illinois, USA
  
  An Accelerated Life Test (ALT) of the Phytron stepper motor used in the LCLS-II cavity tuner has been conducted at JLab. Since the motor will reside inside the cryomodule, any failure would lead to a very costly and arduous repair. As such, the motor was tested for the equivalent of 30 lifetimes before being approved for use in the production cryomodules. The 9-cell LCLS-II cavity is simulated by disc springs with an equivalent spring constant. Plots of the motor position vs. tuner position ' measured via an installed linear variable differential transformer (LVDT) ' are used to measure motor motion. The titanium spindle was inspected for loss of lubrication. The motor passed the ALT, and is set to be installed in the LCLS-II cryomodules.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-MOPB110  
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TUXAA01 CEPC SRF System Design and Challenges ion, cavity, SRF, HOM 332
 
  • J.Y. Zhai, Y.L. Chi, J. Dai, J. Gao, R. Ge, D.J. Gong, R. Han, T.M. Huang, S. Jin, Z.Q. Li, B. Liu, Z.C. Liu, Q. Ma, F. Meng, Z.H. Mi, G. Pei, Q. Qin, P. Sha, Q.Y. Wang, T.X. Zhao, H.J. Zheng
    IHEP, Beijing, People's Republic of China
  • C. Pagani
    Università degli Studi di Milano & INFN, Segrate, Italy
  
  Funding: Work supported by National Key Programme for S&T Research and Development of China (Grant NO.: 2016YFA0400400)
CEPC is a 100 km circular electron positron collider operating at 90-240 GeV center-of-mass energy of Z, W and Higgs bosons. CEPC and its successor SPPC, a 100 TeV center-of-mass super proton-proton collider, will ensure the elementary particle physics a vibrant field for decades to come. The conceptual design report (CDR) of CEPC will be completed in the end of 2017 as an important step to move the project forward. In this contribution, CEPC SRF system CDR design and challenges will be introduced, including the system layout and parameter choices, configuration at different operation energies, transient beam loading and its compensation, cavity fundamental mode (FM) and higher order mode (HOM) induced coupled bunch instabilities (CBI) and the beam feedback requirement, etc. The SRF technology R&D plan and progress as well as the SRF infrastructure and industrialization plan are discussed at last. 		 
slides icon Slides TUXAA01 [9.124 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUXAA01  
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TUXAA02 HIE Isolde Cavity Production & Cryomodule Commissioning, Lessons Learned ion, cavity, ISOL, linac 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, SRF, linac 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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TUPB014 In-situ Bulk Residual Resistivity Ratio Measurement on Double Quarter Wave Crab Cavities cavity, ion, niobium, luminosity 415
 
  • N.C. Shipman, A. Castilla, K.G. Hernández-Chahín, A. Macpherson
    CERN, Geneva, Switzerland
  • I. Ben-Zvi
    BNL, Upton, Long Island, New York, USA
  • G. Burt, N.C. Shipman
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • K.G. Hernández-Chahín
    Universidad de Guanajuato, División de Ciencias e Ingenierías, León, Mexico
  • J.A. Mitchell
    Lancaster University, Lancaster, United Kingdom
  • N.C. Shipman
    UMAN, Manchester, United Kingdom
  
  A four wire measurement was used to measure the bulk RRR on two DQW Crab Cavities. The measurement procedure is explained and the values obtained for each cavity are compared together with the values obtained from Niobium samples of the same stock from which the cavities were manufactured. Measurement errors and carefully analysed and further improvements to the measurement procedure are suggested.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB014  
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TUPB021 First Considerations on HZB High Frequency Elliptical Resonator Stiffening ion, cavity, simulation, SRF 428
 
  • E.N. Zaplatin
    FZJ, Jülich, Germany
  • H.-W. Glock, J. Knobloch, A. Neumann, A.V. Vélez
    HZB, Berlin, Germany
  
  There are two projects that currently are under development and construction at HZB which utilize high frequency elliptical resonators ' Energy Recovery Linac Prototype (BERLinPro, 7-cell, 1300 MHz, β=1) and BESSY Variable pulse-length Storage Ring (VSR, 5-cell, 1500/1750 MHz, β=1). A critical issue of both projects is small effective beam loading in cavities operating at high CW fields (Eacc of 20 MV/m) with a narrow band width. This necessitates precise tuning and therefore good compensation of microphonics and coupled Lorentz-force detuning driven instabilities. Here we present a conceptual study of an integrated SRF resonator and helium vessel structure design to ensure a reduced resonance frequency dependence on pressure and Lorentz forces to minimize their impact on the accelerating field profile.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB021  
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TUPB036 R&D of CEPC Cavity cavity, ion, SRF, experiment 463
 
  • P. Sha
    Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing, People's Republic of China
  • B. Liu, Z.H. Mi, J.Y. Zhai, X.Y. Zhang, H.J. Zheng
    IHEP, Beijing, People's Republic of China
  
  Funding: This study was supported by National Key Programme for S&T Research and Development (Grant NO.: 2016YFA0400400) and National Natural Science Foundation of China (Grant NO.: 11505197)
CEPC will use 650 MHz cavities for the collider (Main Ring) and 1.3 GHz cavities for the Booster. Each booster cryomodule contains eight 1.3 GHz 9-cell cavities, which is similar as LCLS-II. Each collider cryomodule contains six 650 MHz 2-cell cavities, which is totally new. So our R&D of CEPC cavity mainly focuses on the 650 MHz 2-cell cavity. A cryomodule which consists of two 650 MHz 2-cell cavities has began in early 2017. In this thesis, the RF and mechanical design is displayed with Helium Vessel. Besides, multipacting is analyzed. In order to achieve high Q, N-doping is also studied. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB036  
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TUPB096 SRF Cavity Assembly in Clean Room with Horizontal Laminar Flow ion, cavity, GUI, SRF 620
 
  • A. Miyamoto, H. Hara, K. Sennyu, T. Yanagisawa
    MHI-MS, Kobe, Japan
  
  Mitsubishi Heavy Industries Mechatronics Systems(MHI-MS) has developed manufacturing process of superconducting cavitis for a long time. In this presentation, recent progress will be reported.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-TUPB096  
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TUPB106 Standardized Beamline Particulate Characterization Analysis: Initial Application to CEBAF and LCLS-II Cryomodule Components ion, cavity, SRF, linac 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, linac, 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, linac, ISOL 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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WEYA05 Progress Toward 2 K High Performance Half-wave Resonators and Cryomodule ion, cavity, cryogenics, SRF 692
 
  • Z.A. Conway, B.M. Guilfoyle, M. Kedzie, M.P. Kelly, T. Reid
    ANL, Argonne, Illinois, USA
  • H. Guo
    IMP/CAS, Lanzhou, People's Republic of China
  
  Funding: This material is based upon work supported by the U.S. DOE, Office of Science's Office of Nuclear Physics and Office of High Energy Physics, contract numbers DE-AC02-06CH11357 and DE-AC02-76CH03000.
Argonne National Laboratory is implementing a novel 2.0 K superconducting cavity cryomodule operating at 162.5 MHz. This cryomodule is designed for the acceleration of 2 mA H-/proton beams from 2.1 to 10.3 MeV as part of the Fermilab Proton Improvement Project-II (PIP-II). The 2.0 K cryomodule is comprised of 8 half-wave cavities operated in the continuous wave mode with 8 superconducting magnets, one in front of each cavity. In this paper we will review recent cavity results which demonstrate continuous-wave operated cavities with low-field residual resistances of 2.5 nΩ which achieve peak surface fields up to 134 MV/m and 144 mT, electric and magnetic respectively, with field emission onset fields greater than 70 MV/m in the production cavities following the prototyping effort. 		 
slides icon Slides WEYA05 [1.967 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-WEYA05  
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THXA03 Crab Cavities for the High-luminosity LHC ion, cavity, luminosity, HOM 695
 
  • R. Calaga
    CERN, Geneva, Switzerland
  
  Funding: This work has been supported by the HL-LHC project (and by DOE or any other collaborating institutes, when applicable).
As a first step towards the realization of crab crossing for HL-LHC, two superconducting crab cavities are foreseen to be tested with proton beams for the first time in the SPS. The progress on the cavity fabrication, RF test results, cryomodule development and integration into the SPS are presented. Some aspects of the beam tests with crab cavities in the SPS are outlined. 		 
slides icon Slides THXA03 [12.629 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THXA03  
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THYA01 Performance Testing of FRIB Early Series Cryomodules ion, cavity, linac, 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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THYA02 Achievement of Stable Pulsed Operation at 36 MV/m in STF-2 Cryomodule at KEK ion, cavity, operation, accelerating-gradient 722
 
  • Y. Yamamoto, T. Dohmae, M. Egi, K. Hara, T. Honma, E. Kako, Y. Kojima, T. Konomi, T. Kubo, T. Matsumoto, T. Miura, H. Nakai, K. Nakanishi, G.-T. Park, T. Saeki, H. Shimizu, T. Shishido, T. Takenaka, K. Umemori
    KEK, Ibaraki, Japan
  
  In the Superconducting RF Test Facility (STF) in KEK, the cooldown test for the STF-2 cryomdoule with 12 cavities has been done totally three times since 2014. In 2016, the 3rd cooldown test for the STF-2 cryomodule including the capture cryomodule with 2 cavities was successfully carried out. The main achievement is the vector-sum operation with 8 cavities at average accelerating gradient of 31 MV/m as the ILC specification (2 of 8 cavities achieved 36 MV/m with piezo compensation), and the others are the measurement for Lorenz Force Detuning (LFD) and unloaded Q value, and Low Level RF (LLRF) study, etc. In this paper, the result for the STF-2 cryomodule in three cooldown tests will be presented in detail.  
slides icon Slides THYA02 [4.042 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THYA02  
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THYA05 Developments and Progress with ESS Elliptical Cryomodules at CEA-Saclay and IPN-orsay ion, cavity, cryogenics, vacuum 729
 
  • F. Peauger, C. Arcambal, F. Ardellier, S. Berry, P. Bosland, A. Bouygues, E. Cenni, J.-P. Charrier, G. Devanz, F. Éozénou, A. Gaget, D. Gevaert, A. Gomes, T. Hamelin, X. Hanus, P. Hardy, V.M. Hennion, T.J. Joannem, C. Marchand, O. Piquet, J.P. Poupeau, B. Renard, P. Sahuquet, T. Trublet
    CEA/DRF/IRFU, Gif-sur-Yvette, France
  • C. Darve
    ESS, Lund, Sweden
  • G. Olivier
    IPN, Orsay, France
  
  CEA Saclay in collaboration with IPN Orsay is in charge of the ESS elliptical cavities cryomodule design, prototyping and series production. Two cryomodule prototypes are being developed and will be tested at CEA Saclay before starting the series production. The main cryomodule design features are first reminded. We present the cavities and couplers test results and the achieved assembly sequences of the first medium beta cavities cryomodule demonstrator M-ECCTD. The progress on the preparation of the CEA cryomodule test station is given. The procurement status and development plan of the second high beta demonstrator H-ECCTD are also reported. Finally we give the components procurement progress and the assembly strategy of the 30 series cry-omodules to be integrated at CEA before delivery to ESS at Lund.  
slides icon Slides THYA05 [11.226 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-SRF2017-THYA05  
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THYA06 Long-term Operation Experience with Beams in Compact ERL Cryomodules ion, cavity, operation, linac 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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FRXAA01 Production Status of Superconducting Cryomodules for the Facility for Rare Isotope Beams ion, cavity, linac, 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, linac, 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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