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Current Control System for Superconducting Coils of LHD (H JP9705042 " •• * ISSN 0915 5348 JP9705042 NIFS-PR0C--28 NATIONAL INSTITUTE FOR FUSION SCIFXCE Proceedings of the Symposium on Cryogenic Systems for Large Scale Superconducting Applications May 27 - 29, 1996 Ceratopia - Toki and NIFS Toki, Japan T. Mito (Ed.) (Received- Sep. 2, 1996 ) NIFS-PROC-28 Sep. 1996 2 8 N! 1 6 National Laboratory for High Energy Physics, 1996 KEK Reports are available from: Technical Information & Library National Laboratory for High Energy Physics 1-1 Oho, Tsukuba-shi Ibaraki-ken, 305 JAPAN Phone: 0298-64-5136 Telex: 3652-534 (Domestic) (0)3652-534 (International) Fax: 0298-64-4604 Cable: KEK OHO E-mail: [email protected] (Internet Address) Internet: http://www.kek.jp Proceedings of the Symposium on Cryogenic Systems for Large Scale Superconducting Applications Edited by Toshiyuki Mito May 27-29, 1996 Ceratopia-Toki and NIFS Toki, Japan Supported by NIFS Symposium and JSPS-DFG Seminar Keywords; Cryogenic system, Superconducting Application, Large Helical Device, Fusion Device, High Energy Physics "•V. A commemorative Photo of participants on the Symposium at the evening of the first day (May 27, 1996). Organizers Chairman Junya Yamamoto (NIFS) Members SadaoSatoh(NlFS) Toshiyuki Mito (NIFS) Peter Komarck (FZK) Collaborating Staffs T. Baba Y. Kato M. Shoji H. Chikaraishi R. Maekawa K. Sugiyama M. lima S. Moriuchi K. Takahata S. imagawa A. Nishimura H. Tamura A. Iwamoto K. Ohba S. Yamada S. Kato H. Sckiguchi N. Yanagi PREFACE It was twenty years ago that a high field superconducting magnet using a novel pressurized supcrfluid helium cryostat was dramatically reported by a cryogenics group of CEN Grenoble at the Sixth International Cryogenic Engineering Conference in Grenoble, France. This research report verified that cryogenic systems were the key technology for the improvement of the applied superconductivity. In these twenty years, along with material development and innovation of machine operation engineering, a lot of new technologies in the field of cryogenic engineering had been developed. In the field of fusion research, high energy particle physics and space physics, long time operation of cryogenic system have been achieved. In accordance with the recent high performance of superconductivity and the tendency of research orientation to unrcachablc parameter region, quite a few big projects using superconductivity have been undertaking. NIFS symposium "Cryogenic Systems for Large Scale Superconducting Application" was planned to present operation experience of existing apparatus, to show the planning of projects which involve the construction of the cryogenic system for superconducting applications and to give new information of supcrfluid helium technology, with the limited number of specialist of the field. The symposium was held in Toki-city. where the NIFS (National Institute for Fusion Science) is located, from May 27 to 29, 1996, just after the 16th International Cryogenic Engineering Conference. It was financially supported by NIFS and the Japanese-German Cooperative Science Promotion Program (Japan side sponsor organization is Japan Society for the Promotion of Science - JSPS and Germany side is Deutsche Forschungsgcmcinschaft - DFG). Total number of attendants was 97. The program of the Symposium was composed of 33 oral presentations and 14 poster presentations. The oral presentation was classified into (l)Cryogcnic Systems for Experimental Fusion Devices. (2)Tcst Facilities for Large Scale Superconducting Application. (3)Largc Scale Cryogenic System for High Energy Physics, (4)Cryogcnic Systems for Large Scale Superconducting Applications, (5)Large Helical Device, (6)Opcration Experiences and Research Works on Large Scale Cryogenic Systems, (7)Dcsign and Numerical Simulation of Cryogenic Systems. Details of the Large Hcliatl Device (LHD) was mostly presented in poster sessions at NIFS Main Hall, together with the site tour in NIFS. Since the Symposium was a single session type and limited in cryogenic systems, we could make the discussion deeper and more fruitful than in large conference. As a symposium planner, I would like to extend my hearty appreciation to all speakers, audience. NIFS staffs. JSPS and DFG. Junya Yamamoto, Symposium chairman Contents Cryogenic Systems for Large Scale Superconducting Applications (NIFS symposium and JSPS-DFG Seminar) 1. Cryogenic Systems for Experimental Fusion Devices. Cryogenics in the Large Helical Device. 1 (J. Yamamoto; NIFS) 10 Years of Operation of the Tore Supra Cryogenic System. 8 (B. Gravil, B. Jager, F. Minot; CEA/Cadarache) Operation of the Nb3Sn Superconducting Toroidal Magnet System on 12 TRIAM-1M. (S. Itoh, K. Nakamura, M. Sakamoto, K. Makino, E. Jotaki; Advanced Fusion Research Center, Kyushu Univ.) JET Experience with the Large Scale Cryogenic System. 16 (W. Obert; JET joint Undertaking) 2. Test Facilities for Large Scale Superconducting Application. FZK - Experiences of Cooling Large S.C. Systems. 20 (W. Lehmann; FZK) Thermomechanical Pumps for Cooling with Forced Flow of Superfluid 25 Helium. (A. Hofmann; FZK) 21 T Superconducting Magnet System with Saturated Superfluid Helium 29 Cooling. (T. Kiyoshi, M. Kosuge, F. Matsumoto, H. Nagai, A. Sato, K. Inoue, H. Maeda and H. Wada; NRIM) Cryogenic System for CS Test Facility. 33 (T. Kato, K. Hamada, K. Kawano, K. Matsui, T. Hiyama, T. Honda, K. Nishida, S. Sekiguchi, K. Ootsu and H. Tsuji; JAERT) 3. Large Scale Cryogenic System for High Energy Physics. Cryogenic System for TRISTAN RF Cavities. 37 (K. Hosoyama*, K. Hara*, A. Kabe*, Y. Kojima*, T. Ogitsu*, Y. Sakamoto*, Y. Morita*, T. Fujita** and T. Kanekiyo**; *KEK, **Hitachi Ltd.) The HERA Cryogenic System as an Example for a Large Scale Cryogenic 41 System with High Availability and Reliability. (H. Lierl; DESY) Helium Cryogenic Systems for the LEP2 and LHC Projects at CERN. 47 (Ph. Lebrun; CERN) Cryogenic System for the Tevatron. 53 (M.G. Geynisman, B.L. Norris, J.N. Makara, J.C. Theilacker; Fermi National Accelerator Laboratory) C - 1 Cryogenic System for the Muon g-2 Superconducting Magnet. 57 (L.'X. Jia*,~G. Buncc*, J.R. Cullcn*, M.A. Green**, C. Pai*. 1,. Snydstrup* and T. Tallerico*: *Brookhaven National Laboratory, **E. (). Lawrence Berkeley National Laboratory) 4a. Cryogenic Systems for Large Scale Superconducting Applications (I). Cooling System for Wendclstein 7-X. 61 (F. Schaucr; Max-Planck-lnstitut fur Plasmaphysik) investigation of the Supcrfluid Helium Cooling Scheme for the LHC 65 Superconducting Magnets. (B. Rousset; CEA-Grenoble/DRFMC/SBT) The Cryogenic System for the NHMFL Hybrid Magnet. 69 (S.W. Van Scivcr, K. Bartholomew and S.J. Wclton; NHMFL) 4b. Cryogenic Systems for Large Scale Superconducting Applications (II). Cryogenic Design of 70MW Class Superconducting Generators. 73 (T. Ichikawa; Super-GM) Cryogenics for Magnetic Levitating Train. 77 (H. Nakashima, Railway Technical Research Institute) A Cryogenic System for HT-7 Tokamak. 81 (Y. Bi; Institute of Plasma Physics) 4c. Cryogenic Systems for Large Scale Superconducting Applications (III). The Cryogenic System for the Superconducting eV Linear Collider 85 TESLA (G. Horlitz; DESY) Reference Design for the TESLA Refrigerators. 90 (H. Quack, M. Kauschkc, Ch. Haherstroh; Technische Universittit Dresden) Cryogenic System of the ELBF. LINAC in Dresden. 94 (Ch. Hahcrstroh. H. Quack; Technische Universitdt Dresden) 5. Large Helical Device (LHD). Large Helical Device Project for SC Steady-State Fusion Experiment. 98 (O. Motojima; NIFS) Cryogenic System for the Large Helical Device. 104 (X Mito; NIFS) LHD Poster Sessions at the LHD Experimental Building. 1) Present Status of the Large Helical Device (T. Satow). 108 2) Helical Coils for LHD (S. Imagawa). 112 3) Poloidal Coils for the Large Helical Device (LHD) (K. Takahata). 116 C 2 4) Superconducting Current Feeder System for the LHD 120 (S. Yamada). 5) Coil Power Supplies for LHD and Reliability Test of OV Coil 124 Protection System (S. Tanahashi). 6) Current Control System for Superconducting Coils of LHD (H. 128 Chikaraishi). 7) Mechanical Test Results for Coil Packs Simulating Superconducting 132 Coils in LHD (H. Tamura). 8) Fracture Toughness of Structural Material for LHD 136 (A. Nishimura). 9) Heat Transfer Measurements for the Stability Analyses of the Helical 140 Coil Superconductor (A. Iwamoto). 10) Design and Experiments on Component Hardwares for LHD 144 Cryogenic System (S. Satoh). 11) Design of Central Control System for Large Helical Device 148 (H. Yamada). 12) Cryogenic Control System for LHD (T. Mito). 152 13) Test Operation of the Helium Refrigeration System with a Dummy 156 Heat Load Apparatus (R. Maekawa). 14) Quench Analysis of the Helical Coils of the Large Helical Device 160 (N. Yanagi). 6. Operation Experiences and Research Works on Large Scale Cryogenic Systems. Operations Experience in Cryogenic Measurement Techniques and 164 Process Control During Testing S.C. Magnets at the FZK TOSKA Facility. (M. SiiBer; FZK) Construction and Operation of a 10 kW Class Helium Refrigerator for 168 LHD. (S. Satoh; N1FS) Cooling and Excitation Tests of a Single Inner Vertical Poloidal Coil. 172 (K. Takahata; NIFS) Cryogenic Mechanical Test Facilities and Test Results. 176 (A. Nishimura; NIFS) Research Works on Large Scale Cryogenic Systems at SWIP. 180 (H. Li, M. Pu; Southwestern Institute of Physics) 7. Design and Numerical Simulation of Cryogenic Systems. Cryogenics of the K500 Superconducting Cyclotron at VEC Center 184 Calcutta. (N. Bhattacharya; Variable Energy Cyclotron Centre) Design of Supcrfluid-coolcd
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