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Active control of type-I edge localized modes on JET

Y Liang, H R Koslowski, P R Thomas, E Nardon, S Jachmich, B Alper, P Andrew, Y Andrew, G Arnoux, Y Baranov2007年Plasma Physics and Controlled FusionIF 2.2出版社

The operational domain for active control of type-I edge localized modes (ELMs) with an n = 1 external magnetic perturbation field induced by the ex-vessel error field correction coils on JET has been developed towards more ITER-relevant regimes with high plasma triangularity, up to 0.45, high normalized beta, up to 3.0, plasma current up to 2.0 MA and q95 varied between 3.0 and 4.8. The results of ELM mitigation in high triangularity plasmas show that the frequency of type-I ELMs increased by a factor of 4 during the application of the n = 1 fields, while the energy loss per ELM, ΔW/W, decreased from 6% to below the noise level of the diamagnetic measurement (<2%). No reduction of confinement quality (H98Y) during the ELM mitigation phase has been observed. The minimum n = 1 perturbation field amplitude above which the ELMs were mitigated increased with a lower q95 but always remained below the n = 1 locked mode threshold. The first results of ELM mitigation with n = 2 magnetic perturbations on JET demonstrate that the frequency of ELMs increased from 10 to 35 Hz and a wide operational window of q95 from 4.5 to 3.1 has been found.

日本語訳

JETにおける外部真空容器誤差磁場補正コイルによって誘起されるn = 1外部磁場摂動を用いたI型ELMの能動制御のための運転領域は、よりITERに関連した領域、すなわち高三角形度(最大0.45)、高規格化ベータ(最大3.0)、プラズマ電流(最大2.0 MA)、およびq95を3.0から4.8の範囲で変化させた領域へと拡張されてきた。高三角形度プラズマにおけるELM緩和の結果は、n = 1磁場印加中にI型ELMの周波数が4倍に増加し、一方でELMあたりのエネルギー損失ΔW/Wは6%からダイアモンド磁気測定のノイズレベル(<2%)以下に減少したことを示している。ELM緩和期間中、閉じ込め品質(H98Y)の低下は観測されなかった。ELMが緩和されるための最小n = 1摂動磁場振幅は、q95が低くなるにつれて増加したが、常にn = 1ロックドモード閾値以下に留まった。JETにおけるn = 2磁場摂動を用いたELM緩和の最初の結果は、ELMの周波数が10 Hzから35 Hzに増加し、q95が4.5から3.1に及ぶ広い運転窓が存在することを示している。

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