Keyword: cryogenics
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TUPO019 SPIRAL2 Cryogenic System Thermodynamic Behavior Prediction Through Dynamic Modeling cryomodule, cavity, controls, experiment 366
 
  • A.V. Vassal, P.-E. Bernaudin, A. Ghribi
    GANIL, Caen, France
  • P.-E. Bernaudin
    CEA/DSM/IRFU, France
  • P. Bonnay, F. Bonne
    CEA/INAC, Grenoble Cedex 9, France
  • F. Millet
    CEA, Grenoble, France
 
  SPIRAL 2 (Caen, France) is a state of the art superconducting linear accelerator composed of 26 quarter wave accelerating cavities. Each cavity is plunged in a liquid helium bath at 4.4 K itself surrounded by a thermal shield at 70 K. In this paper, a dynamic model of the cryogenic systemof the LINAC is proposed. Thismodel simulates the dynamic behaviour of the 19 cryomodules and their respective valves box connected through the cryodistribution. Model accuracy is evaluated through a comparison between simulation and experimental data. Using the model we should be able to predict the behaviour of the cryogenic system for different beam operating conditions of the accelerator. The model also highlights the link between the cryogenic system and the cavity RF losses through a dynamic estimator of those RF losses in the cavity walls. The latter could be used as a rough estimator of the quality factor of a cavity.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO019  
About • paper received ※ 13 September 2018      issue date ※ 18 January 2019  
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TUPO053 Fabrication of Nb Mushroom Shaped Cavity for Evaluation of Multi-layer Thin-film Superconductor cavity, vacuum, electromagnetic-fields, superconducting-cavity 454
 
  • H. Oikawa
    Utsunomiya University, Utsunomiya, Japan
  • K. Enami, H. Hayano, H. Inoue
    KEK, Ibaraki, Japan
  • T. Higashiguchi
    Center for Optical Research and Education, Utsunomiya University, Utsunomiya, Japan
 
  The accelerating gradient of the Nb superconducting RF cavity seems to reach the limit due to the RF critical magnetic field of the Nb material. To obtain more higher gradient, there has been proposed a method of increasing an RF critical magnetic field of the cavity inner surface by coating of multi-layer thin-film superconductor. It is needed to demonstrate improvement RF critical magnetic field of the RF cavity coated with multi-layer thin-film superconductor. To optimize thin-film superconductor, sample tests are required. A cavity for sample test is necessary to produce a strong RF magnetic field parallel to the surface of the sample for evaluating RF critical magnetic field. For such a cavity, we designed a mushroom shaped cavity made of Nb which is operated in cryogenic temperature. Input and pick up antenna coupler are also designed electrically and mechanically. The connection design of sample plate and cavity bottom plate in superconducting state is also designed. The Nb mushroom shaped cavity is under fabrication. Fabrication method and status are reported in this paper.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-TUPO053  
About • paper received ※ 17 September 2018      issue date ※ 18 January 2019  
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THPO067 Control System and Experiment for RAON HWR Cryomodules cryomodule, cavity, controls, PLC 845
 
  • H. Kim, J.W. Choi, C.O. Choi, H. Jang, Y.W. Jo, H.C. Jung, Y. Jung, J.W. Kim, M.S. Kim, Y. Kim, D.Y. Lee, M. Lee, S. Lee, K.T. Seol, K.T. Son
    IBS, Daejeon, Republic of Korea
 
  A prototype of half-wave resonator (HWR) cryomodules is fabricated and tested. Cables and tray are installed for horizontal test. The design and the piping and instrumentation diagram (P&ID) of the HWR cryomodule are presented. The HWR cryomodule is tested with developed programmable logic controller (PLC) and experimental physics and industrial control system (EPICS) control systems. The heat loads of the HWR cryomodule for static and dynamic are measured.  
poster icon Poster THPO067 [0.631 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO067  
About • paper received ※ 10 September 2018      issue date ※ 18 January 2019  
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THPO072 Cryogenic Tests of the Superconducting β=0.069 CH-cavities for the HELIAC-project cavity, heavy-ion, linac, accelerating-gradient 855
 
  • 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
 
  In the future the existing UNILAC (UNIversal Linear Accelerator) at GSI will be most exclusively used as an injector for FAIR to provide short pulse high intensity heavy ion beams at low repetition rates [Barth3]. A new superconducting (sc) continuous wave (cw) high intensity heavy ion Linac should provide ion beams with max. duty factor above the coulomb barrier for the Super Heavy Element (SHE) program at GSI. The fundamental Linac design comprises a low energy beam transport (LEBT)-section followed by a sc Drift Tube Linac (DTL) consisting of sc Crossbar-H-mode (CH) structures for acceleration up to 7.3 MeV/u [*]. After the successful test and commissioning of the first demonstrator section with heavy ion beam from the HLI in 2017 [**], the next two sc CH-structures have been constructed and the first one has been extensively tested at cryogenic temperatures at the Institute for Applied Physics (IAP) at Goethe University Frankfurt (GUF). The results of the final cold test of the first CH-structure as well as the next steps realizing a new sc cw heavy ion LINAC at GSI will be presented.
[*]W. Barth et al., "Further investigations for a superconducting cw-Linac at GSI"
[**]W. Barth et al., "First high intensity heavy ion beam tests with a superconducting multi gap CH-cavity"
 
poster icon Poster THPO072 [1.150 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2018-THPO072  
About • paper received ※ 11 September 2018      issue date ※ 18 January 2019  
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