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Control of plasma profiles in DIII-D discharges

P Gohil, T E Evans, J R Ferron, R A Moyer, C C Petty, K H Burrell, T A Casper, A M Garofalo, A W Hyatt, R J Jayakumar2006年Plasma Physics and Controlled FusionIF 2.2出版社

Active control of plasma profiles is an essential requirement for operating within plasma stability limits, for steady-state operation and for optimization of the plasma performance. In DIII-D, plasma profiles have been actively controlled using various actuators in the following manner: (a) real time closed loop control of the q profile evolution using electron cyclotron heating and neutral beam injection as actuators; (b) active control of the density and pressure profiles in quiescent H-mode and quiescent double barrier plasmas using electron cyclotron current drive (ECCD) and pellet injection; (c) active control of the edge profiles to suppress edge localized modes using resonant magnetic perturbation with toroidal mode number n = 3, (d) real time control of the current density profile to suppress neoclassical tearing modes using localized deposition of co-ECCD.

日本語訳

プラズマ分布の能動制御は、プラズマ安定性限界内での運転、定常運転、およびプラズマ性能の最適化にとって不可欠な要件である。DIII-Dでは、プラズマ分布は以下の方法で様々なアクチュエータを用いて能動制御されてきた:(a) 電子サイクロトロン加熱と中性粒子ビーム入射をアクチュエータとして用いたq分布時間発展のリアルタイム閉ループ制御;(b) 電子サイクロトロン電流駆動(ECCD)とペレット入射を用いたクエセントHモードおよびクエセント二重障壁プラズマにおける密度・圧力分布の能動制御;(c) トロイダルモード数n = 3の共鳴磁場摂動を用いた周辺局在モード抑制のための周辺分布の能動制御;(d) 共回転ECCDの局所堆積を用いた新古典テアリングモード抑制のための電流密度分布のリアルタイム制御。

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