Spectroscopic Study of Molybdenum Impurity Generation in LHW Sustained Plasmas on TST-2 Spherical Tokamak

被引：0

作者：

Tian Y. ^{[1
]}

Ejiri A. ^{[1
]}

Tsujii N. ^{[1
]}

Lin Y. ^{[1
]}

Shinohara K. ^{[1
]}

Jang S. ^{[1
]}

Peng Y. ^{[1
]}

Iwasaki K. ^{[1
]}

Adachi F. ^{[1
]}

机构：

[1] Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa

来源：

Plasma and Fusion Research | 2024年 / 19卷

基金：

日本学术振兴会;

关键词：

fast electron; impurity; lower hybrid current drive; RF sheath;

D O I：

10.1585/PFR.19.1402010

中图分类号：

学科分类号：

摘要：

Impurity generation mechanisms including RF sheath sputtering and heating from fast electrons were explored in LHW sustained plasmas on TST-2 spherical tokamak. Molybdenum impurity was measured with a high-resolution spectrometer and the heating effect on a molybdenum target plate was estimated with a fast camera system. The LHW power modulation experiment indicates that the RF sheath sputtering dominated impurity generation from the antenna limiters (molybdenum) under the current plasma parameters. In addition, the target plate insertion experiment shows that molybdenum atoms were released from the target when heated by fast electrons accelerated by LHW. Although the heating effect was negligible for the antenna limiters, it could become significant under higher plasma parameters or during longer pulses. © 2024 The Japan Society of Plasma Science and Nuclear Fusion Research

引用

共 42 条

[21] Development of a Compact Hard X-Ray Camera on the TST-2 Spherical Tokamak
Ejiri, Akira
Aoi, Yuki
Yamazaki, Hibiki
Tsujii, Naoto
Takase, Yuichi
Watanabe, Osamu
Ko, Yongtae
Rice, James H. P.
Peng, Yi
Iwasaki, Kotaro
Matsuzaki, Kyohei
Osawa, Yuki
Yoshimura, Yasuo
PLASMA AND FUSION RESEARCH, 2020, 15 (15): : 1 - 2
[22] Electron Bernstein wave emission diagnostic assisted by reflectometry on TST-2 spherical tokamak
Shiraiwa, S
Nagashima, Y
Ushigome, M
Yamada, T
Taniguchi, T
Ohara, S
Yamagishi, K
Kasahara, H
Iijima, D
Kobori, Y
Nishi, T
Aramasu, M
Ejiri, A
Takase, Y
REVIEW OF SCIENTIFIC INSTRUMENTS, 2003, 74 (03): : 1453 - 1456
[23] Measurements of edge plasma parameters during internal reconnection events in the TST-2 spherical tokamak
Furui, H.
Ejiri, A.
Nagashima, Y.
Takase, Y.
Sonehara, M.
Tsujii, N.
Roidl, B.
Shinya, T.
Togashi, H.
Homma, H.
Nakamura, K.
Takeuchi, T.
Yajima, S.
Yoshida, Y.
Toida, K.
Takahashi, W.
Yamazaki, H.
PHYSICS OF PLASMAS, 2017, 24 (06)
[24] Development of a hard X-Ray profile measurement system in the TST-2 spherical tokamak
Togashi H.
Yamazaki H.
Ejiri A.
Takase Y.
Tsujii N.
Yajima S.
Yoshida Y.
Plasma and Fusion Research, 2017, 12
[25] Measurement of the Lower Hybrid Wave Using RF Magnetic Probes on the TST-2 Spherical Tokamak
Ko, Yongtae
Tsujii, Naoto
Yajima, Satoru
Takase, Yuichi
Ejiri, Akira
Watanabe, Osamu
Yamazaki, Hibiki
Moeller, Charles P.
Yoshimura, Yasuo
Yoshida, Yusuke
Iida, Yusuke
Iwasaki, Kotaro
Kawamata, Yuya
Sakamoto, Sho
Aoi, Yuki
Oishi, Teruki
Matsuzaki, Kyohei
Rice, James
PLASMA AND FUSION RESEARCH, 2019, 14
[26] Measurement of the lower hybrid wave using RF magnetic probes on the TST-2 spherical tokamak
Ko Y.
Tsujii N.
Yajima S.
Takase Y.
Ejiri A.
Watanabe O.
Yamazaki H.
Moeller C.P.
Yoshimura Y.
Yoshida Y.
Iida Y.
Iwasaki K.
Kawamata Y.
Sakamoto S.
Aoi Y.
Oishi T.
Matsuzaki K.
Rice J.
Plasma and Fusion Research, 2019, 14
[27] Calculation of beam trajectories of a heavy ion beam probe diagnostic in the TST-2 spherical tokamak
Nagashima, Yoshihiko
Ejiri, Akira
Fujisawa, Akihide
Takase, Yuichi
IEEJ Transactions on Fundamentals and Materials, 2009, 129 (09) : 575 - 579
[28] Plasma current start-up using the lower hybrid wave on the TST-2 spherical tokamak
Takase, Y.
Ejiri, A.
Inada, T.
Moeller, C. P.
Shinya, T.
Tsujii, N.
Yajima, S.
Furui, H.
Homma, H.
Imamura, K.
Nakamura, K.
Nakamura, K.
Sonehara, M.
Takeuchi, T.
Togashi, H.
Tsuda, S.
Yoshida, Y.
RADIOFREQUENCY POWER IN PLASMAS, 2015, 1689
[29] Plasma current start-up experiments without the central solenoid in the TST-2 spherical tokamak
Takase, Y.
Ejiri, A.
Shiraiwa, S.
Adachi, Y.
Ishii, N.
Kasahara, H.
Nuga, H.
Ono, Y.
Oosako, T.
Sasaki, M.
Shimada, Y.
Sumitomo, N.
Taguchi, I.
Tojo, H.
Tsujimura, J.
Ushigome, M.
Yamada, T.
Hanada, K.
Hasegawa, M.
Idei, H.
Nakamura, K.
Sakamoto, M.
Sasaki, K.
Sato, K. N.
Zushi, H.
Nishino, N.
Mitarai, O.
NUCLEAR FUSION, 2006, 46 (08) : S598 - S602
[30] Non-inductive plasma initiation and plasma current ramp-up on the TST-2 spherical tokamak
Takase, Y.
Ejiri, A.
Kakuda, H.
Oosako, T.
Shinya, T.
Wakatsuki, T.
Ambo, T.
Furui, H.
Hashimoto, T.
Hiratsuka, J.
Kasahara, H.
Kato, K.
Kumazawa, R.
Moeller, C. P.
Mutoh, T.
Nakanishi, A.
Nagashima, Y.
Saito, K.
Sakamoto, T.
Seki, T.
Sonehara, M.
Shino, R.
Togashi, H.
Watanabe, O.
Yamaguchi, T.
NUCLEAR FUSION, 2013, 53 (06)

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