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Aso, Tomokazu; Teshigawara, Makoto; Hasegawa, Shoichi; Aoyagi, Katsuhiro*; Muto, Hideki*; Nomura, Kazutaka*; Takada, Hiroshi; Ikeda, Yujiro
JAEA-Technology 2017-021, 75 Pages, 2017/08
JAEA-Technology-2017-021.pdf:33.03MB
Liquid hydrogen is employed as a cold neutron moderator material at the spallation neutron source of Materials and Life science experimental Facility of Japan Proton Accelerator Research Complex (J-PARC). From January 2015, it became observable that the differential pressure between heat exchangers and an 80 K adsorber (ADS) in a helium refrigerator system increased with operating time. In November 2015, the differential pressure rise became more significant, leading to degrade the refrigerating performance in cooling liquid hydrogen. In order to investigate the cause of the abnormal differential pressure rise between the heat exchangers and the ADS, we carried out visual inspection inside the heat exchangers and analyzed the impurities contained in the helium gas. Unfortunately, we could not identify the impurities causing the performance degradation, but observed a trace of oil in the inlet piping of the heat exchanger. Based on investigations of the abnormal events occurred in the refrigerators with similar refrigerating capacity at other facilities, we took measures that cleaning the heat exchangers with Freon and replacing the ADS with new one. As a result, the differential pressure rise phenomenon was removed to recover the performance. We have detected oil from the Freon used for cleaning the heat exchangers and at a felt supporting charcoal packed in the ADS. In particular, oil was accumulated in membranous form onto the felt at the entrance side in the ADS. The amount of oil contained in the helium gas was about 10 ppb or so, less than the design value, in the helium refrigerator. However, the oil accumulated onto the felt in the ADS through long operating period may cause abnormal differential pressure rise, leading to the performance degradation of the helium refrigerator. Further study is needed to specify the cause more clearly.
Ebisawa, Noboru; Kiuchi, Shigeki*; Kikuchi, Katsumi*; Kawano, Katsumi; Isono, Takaaki
JAEA-Testing 2014-003, 37 Pages, 2015/03
JAEA-Testing-2014-003.pdf:11.7MB
Objective of the ITER CS Model Coil Test Facility is to evaluate a large scale superconducting conductor for fusion using the Central Solenoid (CS) Model Coil, which can generate a 13-T magnetic field in the inner bore with a 1.5m diameter. The facility is composed of a helium refrigerator / liquefier system, a DC power supply system, a vacuum system and a data acquisition system. This report describes that maintenance of the helium refrigerator / liquefier system since the Great East Japan Earthquake in March 2011 until the first operation after the earthquake in December 2012.
Aso, Tomokazu; Tatsumoto, Hideki; Hasegawa, Shoichi; Ushijima, Isamu*; Otsu, Kiichi*; Kato, Takashi; Ikeda, Yujiro
AIP Conference Proceedings 823, p.763 - 770, 2006/05
no abstracts in English
Morii, Yukio; Koike, Yoshihiro; Igarashi, Takeshi*; Kubota, Minoru*; Hiresaki, Yu*; Tanida, Koji*
Physica B; Condensed Matter, 284-288(Part2), p.2014 - 2015, 2000/07
Times Cited Count：0 Percentile：0(Physics, Condensed Matter)no abstracts in English
Koike, Yoshihiro; Morii, Yukio
Hoshasen Kagaku, (68), p.22 - 25, 1999/00
no abstracts in English
Seki, Hiroshi*; Oga, Tokumichi; Akino, Noboru; Tanai, Yutaka*; *; Kuriyama, Masaaki; Ito, Takao; *
KEK Proceedings 99-17 (CD-ROM), 4 Pages, 1999/00
no abstracts in English
Koike, Yoshihiro*; Morii, Yukio; Igarashi, Takeshi*; Kubota, Minoru*; Hiresaki, Yu*; *
Proc. of Int. Cryogenic Engineering Conf. 1998 (ICEC17), p.263 - 266, 1998/00
no abstracts in English
Ushigusa, Kenkichi; Mori, Katsuharu*; *; Nagashima, Keisuke; ; ; Aoyagi, Tetsuo; Takahashi, Yoshikazu; Matsui, Kunihiro; Kikuchi, Mitsuru; et al.
JAERI-Research 97-027, 281 Pages, 1997/03
JAERI-Research-97-027.pdf:9.25MB
no abstracts in English
Katagiri, Masaki
Nihon Genshiryoku Gakkai-Shi, 38(9), p.726 - 727, 1996/00
no abstracts in English
Katagiri, Masaki; Ito, Hirokuni
Radiation Detectors and Their Uses,Proc of 8th Workshop; KEK Proc. 94-7, 0, p.174 - 178, 1994/00
no abstracts in English
; Shibata, Michihiro; Ishii, Tetsuro;
Proc. of the 9th Symp. on Accelerator Science and Technology, p.437 - 439, 1993/00
no abstracts in English
DESY-M-92-01 (Vol. 1), p.76 - 83, 1992/04
no abstracts in English
Shibanuma, Kiyoshi; ; Dairaku, Masayuki; *; Matsuda, Shinzaburo; Ouchi, Yutaka; *; Shibata, Takemasa
Nihon Genshiryoku Gakkai-Shi, 33(12), p.1171 - 1179, 1991/12
Times Cited Count：1 Percentile：19.9(Nuclear Science & Technology)no abstracts in English
Shibanuma, Kiyoshi; ; Dairaku, Masayuki; Ouchi, Yutaka; Shibata, Takemasa
JAERI-M 91-180, 39 Pages, 1991/10
no abstracts in English
Shibanuma, Kiyoshi; ; Dairaku, Masayuki; Kunieda, Shunsuke; Kuriyama, Masaaki; Matsuda, Shinzaburo; Ouchi, Yutaka; Shibata, Takemasa; Shirakata, Hirofumi
Nihon Genshiryoku Gakkai-Shi, 33(10), p.960 - 974, 1991/10
Times Cited Count：1 Percentile：19.9(Nuclear Science & Technology)no abstracts in English
; Ishii, Tetsuro; Ikezoe, Hiroshi; Tomita, Yoshiaki
Nuclear Instruments and Methods in Physics Research A, 287, p.257 - 262, 1990/00
Times Cited Count：12 Percentile：75.58(Instruments & Instrumentation)no abstracts in English
;
Teion Kogaku, 21(2), p.78 - 86, 1986/00
no abstracts in English
; ;
JAERI-M 85-188, 43 Pages, 1985/11
no abstracts in English
Aso, Tomokazu; Teshigawara, Makoto; Hasegawa, Shoichi; Muto, Hideki; Aoyagi, Katsuhiro; Nomura, Kazutaka; Takada, Hiroshi
no journal, ,
no abstracts in English
