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Nakamura, Hirofumi; Higashijima, Satoru; Isobe, Kanetsugu; Kaminaga, Atsushi; Horikawa, Toyohiko*; Kubo, Hirotaka; Miya, Naoyuki; Nishi, Masataka; Konishi, Satoshi*; Tanabe, Tetsuo*
Fusion Engineering and Design, 70(2), p.163 - 173, 2004/02
Times Cited Count：19 Percentile：75.17(Nuclear Science & Technology)In order to establish the effective and conventional in-vessel tritium removal method, glow discharge methods, usually used as wall conditioning, have been applied and examined in vacuum vessel of JT-60U for tritium removal characteristics and kinetics. Release rates of all hydrogen isotopes as well as hydrocarbons from JT-60U vacuum vessel induced by Glow Discharge Cleaning (GDC) with He and H
were measured. Release characteristics of hydrogen isotopes were classified into three different release processes each of which is well described by a simple exponential decay with time. It was found that H GDC showed the superior hydrogen isotope release characteristics than the He GDC, probably because chemical processes, such as isotope exchanges assisted by the chemical sputtering process between discharged hydrogen and hydrogen isotopes plasma facing carbon tiles are enhanced by the H glow discharge. Based on the release kinetics observed in the present work, it is estimated that it will take several days to reduce tritium inventory in the surface area of JT-60U to a half by continuous H GDC at 573 K.
Takeuchi, Suehiro; Nakanoya, Takamitsu; Kabumoto, Hiroshi; Yoshida, Tadashi
Nuclear Instruments and Methods in Physics Research A, 513(3), p.429 - 438, 2003/11
Times Cited Count：3 Percentile：27.66(Instruments & Instrumentation)At the JAERI Tandem accelerator, an acceleration tube replacing plan is proceeding to increase the acceleration voltage toward 20 MV. Lengthy conditioning is generally necessary for a large tube system. We had an idea to clean the tubes with high-pressure water-jet rinsing before installation. We cleaned tubes and tested them at 1 MV and 3 MV. The both results exhibited that the voltages went beyond the rated voltages and discharge activities were much less than the old records. During the test of new tubes at 3 MV, the conditioning proceeded well and an extremely stable condition was fulfilled within 24 hours. In conclusion, the cleaning was found to be a very promising way to improve high-voltage performance of the tubes in a large tube system.
Ushigusa, Kenkichi; Seki, Masami; Suganuma, Kazuaki; Toyoshima, Noboru; Ikeda, Yoshitaka
Fusion Engineering and Design, 45(2), p.137 - 144, 1999/05
Times Cited Count：19 Percentile：78.49(Nuclear Science & Technology)no abstracts in English
Hiroki, Seiji; *; *; Abe, Tetsuya; Murakami, Yoshio
Journal of Nuclear Materials, 224, p.293 - 298, 1995/00
Times Cited Count：7 Percentile：59.15(Materials Science, Multidisciplinary)no abstracts in English
*; Yoshida, Hidetoshi; *; Yamashita, Osamu; Nagashima, Akira; Matoba, Toru
JAERI-M 90-167, 44 Pages, 1990/09
no abstracts in English
