Progress Of Long Pulse Discharges By ECH In LHD - NASA/ADS

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Progress of long pulse discharges by ECH in LHD

• Yoshimura, Y.
;
• Kasahara, H.
;
• Tokitani, M.
;
• Sakamoto, R.
;
• Ueda, Y.
;
• Ito, S.
;
• Okada, K.
;
• Kubo, S.
;
• Shimozuma, T.
;
• Igami, H.
;
• Takahashi, H.
;
• Tsujimura, T. I.
;
• Makino, R.
;
• Kobayashi, S.
;
• Mizuno, Y.
;
• Akiyama, T.
;
• Ashikawa, N.
;
• Masuzaki, S.
;
• Motojima, G.
;
• Shoji, M.
;
• Suzuki, C.
;
• Tanaka, H.
;
• Tanaka, K.
;
• Tokuzawa, T.
;
• Tsuchiya, H.
;
• Yamada, I.
;
• Goto, Y.
;
• Yamada, H.
;
• Mutoh, T.
;
• Komori, A.
;
• Takeiri, Y.
;
• the LHD Experiment Group

Abstract

Using ion cyclotron heating and electron cyclotron heating (ECH), or solo ECH, trials of steady state plasma sustainment have been conducted in the superconducting helical/stellarator, large helical device (LHD) (Ida K et al 2015 Nucl. Fusion 55 104018). In recent years, the ECH system has been upgraded by applying newly developed 77 and 154 GHz gyrotrons. A new gas fueling system applied to the steady state operations in the LHD realized precise feedback control of the line average electron density even when the wall condition varied during long pulse discharges. Owing to these improvements in the ECH and the gas fueling systems, a stable 39 min discharge with a line average electron density n e_ave of 1.1  ×  1019 m-3, a central electron temperature T e0 of over 2.5 keV, and a central ion temperature T i0 of 1.0 keV was successfully performed with ~350 kW EC-waves. The parameters are much improved from the previous 65 min discharge with n e_ave of 0.15  ×  1019 m-3 and T e0 of 1.7 keV, and the 30 min discharge with n e_ave of 0.7  ×  1019 m-3 and T e0 of 1.7 keV.

Publication: Nuclear Fusion Pub Date: April 2016 DOI:

10.1088/0029-5515/56/4/046005

Bibcode: 2016NucFu..56d6005Y full text sources IOP | 🌓