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Start Over Author "K. Ohasa" Journal plasma physics and controlled fusion
2 results on '"K. Ohasa"'

1. Initial experiments in JT-60

Author

T Abe, H Aikawa, N Akaoka, H Akasaka, N Akino, T Akiyama, T Ando, K Anno, T Aoyagi, T Arai, K Arakawa, M Azumi, T Fukuda, H Furukawa, K Hammamatsu, T Haraguchi, K Hayashi, H Hiratsuka, T Hirayama, S Hiroki, K Hiruta, N Hitomi, R Hosoda, N Hosogane, H Ichige, S Iida, T Iijima, Y Ikeda, N Isaji, M Isaka, M Ishihara, Y Itoh, M Kaneko, Y Kawamata, K Kawasaki, M Kikuchi, T Kimura, H Kishimoto, K Kitahara, A Kitsunezaki, K Kodama, Y Koide, T Koike, I Kondo, S Konoshima, H Kubo, S Kunieda, K Kurihara, T Kuroda, H Maeda, M Maeno, M Matsukawa, T Matsukawa, M Matsuo, N Miya, K Miyachi, Y Miyo, M Mizuno, Y Murakami, M Mutoh, M Nagami, A Nagashima, K Nagashima, S Nagaya, H Nakamura, Y Nakamura, M Nemoto, Y Neyatani, S Niikura, H Ninomiya, T Nishitani, T Nishiyama, H Nomata, S Noshiroya, N Ogiwara, K Ohasa, M Ohkubo, K Ohmori, S Ohmori, Y Ohmori, Y Ohsato, T Ohshima, M Ohta, K Otsu, A Oikawa, T Ozeki, A Sakasai, S Sakata, M Sato, M Seimiya, S Seki, M Shiho, M Shitomi, R Shimada, K Shimizu, M Shimizu, Y Shimomura, S Shinozaki, H Shirai, T Sugie, H Sunaoshi, K Suzuki, M Suzuki, S Suzuki, Y Suzuki, S Tahira, M Takahashi, S Takahashi, T Takahashi, H Takatsu, Y Takayasu, S Takeda, H Takeuchi, T Takizuka, S Tamura, E Tanaka, T Tanaka, K Tani, T Terakado, K Tobita, T Tokutake, T Totsuka, N Toyoshima, T Tsugita, S Tsuji, Y Tsukahara, M Tsuneoka, K Ujiie, H Urakawa, Y Uramoto, K Ushigusa, J Yagyu, K Yamada, M Yamamoto, O Yamashita, Y Yamashita, K Yano, H Yokomizo, I Yonekawa, H Yoshida, M Yoshikawa, and R Yoshino

Subjects
Materials science, Nuclear Energy and Engineering, Divertor, Limiter, High density, Plasma, JT-60, Atomic physics, Condensed Matter Physics, Joule heating, Ohmic contact, Plasma current
Abstract

Initial ohmic heating experiments in JT-60 were performed for a three month period of April-June 1985. A maximum plasma current of 1.6 MA was obtained for both divertor and limiter discharges. Low-q discharges of qeff=2.5 and high density discharges of 4.8*1019 m-3 in line-averaged density were obtained in the divertor configuration. In divertor discharges radiated loss from the main plasma can be kept at 20-30% of the ohmic input.

Published
1986
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2. High power heating results on JT-60

Author

M Akiba, H Aikawa, N Akaoka, H Akasaka, N Akino, T Akiyama, T Ando, K Annoh, T Aoyagi, T Arai, K Arakawa, M Araki, M Azumi, S Chiba, M Dairaku, N Ebisawa, T Fujii, T Fukuda, A Funahashi, H Furukawa, K Hamamatsu, M Hanada, M Hara, K Haraguchi, H Hiratsuka, T Hirayama, S Hiroki, K Hiruta, M Honda, H Horiike, R Hosoda, N Hosogane, T Iijima, Y Ikeda, K Ikeda, T Imai, T Inoue, N Isaji, M Isaka, S Ishida, K Itami, N Ichige, T Itoh, T Kakizaki, A Kaminaga, T Katoh, M Kawai, M Kawabe, Y Kawamata, K Kawasaki, K Kikuchi, M Kikuchi, H Kimura, T Kimura, H Kishimoto, S Kitamura, A Kitsunezaki, K Kiyono, N Kobayashi, K Kodama, S Koide, Y Koide, T Kioke, M Komata, I Kondo, S Konoshima, H Kubo, S Kunieda, K Kurihara, M Kuriyama, T Kuroda, M Kusaka, Y Kusama, Y Mabuchi, S Maehara, K Maeno, T Matoba, S Matsuda, M Matsukawa, T Matsukawa, M Matsuoka, Y Miura, N Miya, K Miyachi, Y Mori, S Moriyama, M Mutoh, M Nagami, A Nagashima, K Nagashima, T Nagashima, S Nagaya, O Naitoh, H Nakamura, Y Nakamura, M Nemoto, Y Neyatani, H Ninomiya, N Nishino, T Nishitani, K Obara, H Obinata, Y Ogawa, N Ogiwara, T Ohga, Y Ohara, K Ohasa, H Oohara, T Ohshima, M Ohkubo, S Ohsawa, K Ohta, M Ohta, M Ohtaka, Y Ohuchi, A Oikawa, H Okumura, Y Okumura, K Omori, S Omori, Y Omori, T Ozeki, M Saegusa, N Saitoh, K Sakamoto, A Sakasai, S Sakata, T Sasajima, K Satou, M Satou, A Sakurai, M Sawahata, T Sebata, M Seimiya, M Seki, S Seki, K Shibanuma, R Shimada, T Shimada, K Shimizu, M Shimizu, Y Shimomura, S Shinozaki, H Shirai, H Shirakata, M Shitomi, K Suganuma, T Sugie, T Sugiyama, H Sunaoshi, K Suzuki, M Suzuki, N Suzuki, S Suzuki, Y Suzuki, M Takahashi, S Takahashi, T Takahashi, M Takasaki, H Takatsu, H Takeuchi, A Takeshita, T Takizuka, S Tamura, S Tanaka, T Tanaka, K Tani, M Terakado, T Terakado, K Tobita, T Tokutake, T Totsuka, N Toyoshima, F Tusda, T Tsugita, S Tsuji, Y Tsukahara, M Tsuneoka, K Uehara, M Umechara, Y Uramoto, H Usami, K Ushigusa, K Usui, J Yagyu, M Yamagiwa, M Yamamoto, T Yamamoto, O Yamashita, T Yamazaki, T Yasukawa, K Yokokura, H Yokomizo, K Yokoyama, K Yoshikawa, M Yoshikawa, H Yoshida, R Yoshino, Y Yoshioka, I Yonekawa, T Yoneda, K Watanabe, M G Bell, R J Bickerton, W Englehardt, R J Goldston, E Kallne, J Kallne, H W Jugel, P L Mondiono, F X Solnder, Y Takase, P R Thomas, and K L Wong

Subjects
Electron density, Fusion, Materials science, Nuclear Energy and Engineering, Divertor, Plasma, Atomic physics, JT-60, Condensed Matter Physics, Scaling, Ballooning, Ion
Abstract

From June to October 1987, JT-60 achieved fusion product (ne(0). tau E*.Ti(0)) of 6*1019 m-3.keV.s with hydrogen plasma at plasma current of 2.8 to 3.1 MA with neutral beam power of approximately 20 MW. The central electron density of 1.3*1020 m-3 was obtained at plasma current of 3 MA with 13 approximately 20 MW neutral beam power and the confinement time reached 0.14-0.18 s. An offset linear scaling law like the Shimomura-Odajima scaling on confinement time will be able to reproduce experimental data better than that of the Goldston type scaling. With low beam energy injection approximately 40 keV, confinement degradation was found. Many short periods (0.05 approximately 0.1 s) of H-mode phase were found in outside X-point divertor discharges with NB or NB+RF(LH or IC) heating power above 16 MW. However, improvement in energy confinement time was limited to 10 %. The ballooning/interchange stability analyses were also made for the outside X-point divertor equilibrium in connection with H0-phase capability. Heating powers of 9.5 MW and 1.9 MW were obtained by LHRF, ICRF injection, respectively. In combined LHRF and NB heating, the incremental energy confinement time of 0.064 s was obtained, which is the same level of that of NB heating only. In combined NB and on-axis ICRF heating of low ne discharge, an incremental energy confinement time of 0.21 s was obtained, which is three times as long as those of NB or ICRF heating only. High energy beam ions were accelerated by ICRF in the central region of the plasma.

Published
1988
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