Destabilization of ellipticity-induced Alfvén eigenmodes during ICRF heating and stabilization by negative-ion-based neutral beam injection in JT-60U

Y. Kusama, G. Y. Fu, G. J. Kramer, M. Saigusa, T. Oikawa, T. Ozeki, S. Moriyama, F. V. Tchernychev, M. Nemoto, T. Kondoh, T. Hatae, K. Tobita, M. Kuriyama, C. Z. Cheng, H. Kimura

研究成果: Article査読

5 被引用数 (Scopus)

抄録

High-frequency modes in the 525-550 kHz range with toroidal mode numbers n = 3-7 were excited after the sawtooth crash during ion cyclotron range of frequency (ICRF) heating. Based on the stability analysis using the NOVA-K code, these modes were found to be consistent with ellipticity-induced Alfvén eigenmodes (EAEs) excited in the EAE gap located at the q = 1 surface. A change in the safety factor after the sawtooth crash was essential for the excitation of EAEs in the core region of the plasma. The high-frequency modes were stabilized by the neutral beam injection at 350 keV using negative-ion-based neutral beam (NNB) injectors. Stability analysis using the NOVA-K code has shown that NNB-injected ions enhance the damping of the EAEs and tend to stabilize them.

本文言語English
ページ(範囲)1167-1177
ページ数11
ジャーナルPlasma Physics and Controlled Fusion
41
9
DOI
出版ステータスPublished - 1999 9月 1
外部発表はい

ASJC Scopus subject areas

  • 原子力エネルギーおよび原子力工学
  • 凝縮系物理学

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