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High performance low and high q discharges in DIII-D

T H Osborne, K H Burrell, M S Chu, C B Forest, E A Lazarus, R J La Haye, C L Rettig, B W Rice, G M Staebler, E J Strait1996年Plasma Physics and Controlled FusionIF 2.2出版社

The high performance H-mode regime on DIII-D has been extended to both low q and high q (high ) operation. In high current operation, VH-mode discharges were obtained for the first time with . These discharges had , H = 2.9, , and %-sec. was improved by approximately 50% over previous results. These discharges were obtained with neutral beam injection during the plasma current ramp up which maintained the axial q above 1. In low current operation, neutral beam heated discharges with 100% of the plasma current from non-inductive sources were obtained at high , with , H = 3.1 and . These discharges represent an extension of the high performance regime to , which was made possible by reduction in the locked mode low density limit, as the result of improvements in the magnetic field error correcting coils. These low current discharges do not exhibit some of the standard signatures of VH-mode, but appear to represent a new regime of improved H-mode confinement. Similar, non-VH-mode, high energy confinement discharges were obtained at low density and moderate q.

日本語訳

DIII-Dにおける高閉じ込めモード(Hモード)領域は、低qおよび高qの両方の運転条件に拡張された。高電流運転では、VHモード放電が初めて実現され、その際、__、H=2.9、__、および__%・秒が達成された。これは従来の結果と比較して約50%の改善であった。これらの放電は、プラズマ電流立ち上げ中の中性粒子ビーム入射によって得られ、軸上q値を1以上に維持した。低電流運転では、非誘導電流がプラズマ電流の100%を占める中性粒子ビーム加熱放電が、高__、H=3.1、および__で達成された。これらの放電は、高性能領域の拡張を示すものであり、これは磁場誤差補正コイルの改善による、閉じ込めモードの低密度限界の低減の結果として可能となった。これらの低電流放電は、VHモードの標準的な特徴の一部を示さないが、改善されたHモード閉じ込めの新たな領域を表していると思われる。同様に、非VHモードではあるが、高エネルギー閉じ込め放電が、低密度かつ中程度のq値で得られた。

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diii-d高精度(タイトル一致)

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DIII-D
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