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Ohmic H-modes in the TCV tokamak

H Weisen, F Hofmann, M J Dutch, Y Martin, A Pochelon, J-M Moret, B P Duval, A Hirt, J B Lister, Ch Nieswand1996年Plasma Physics and Controlled FusionIF 2.2出版社

The TCV tokamak has obtained ohmic H-modes in virtually all diverted plasmas with the ion drift directed towards an X-point and in several elongated limiter plasmas. Troyon factors up to 2 and line average densities up to , corresponding to Ithe Greenwald limit, have been obtained in diverted ELM-free H-modes. Quasi-stationary H-modes lasting for the entire current flat top (1.5 s) have been obtained in the presence of regular ELMs. The occurrence and magnitude of ELMs have been found to depend on configurational parameters such as the position of the `active' X-point in unbalanced double-null discharges and the plasma - wall separation in single-null discharges. These dependencies have permitted active control of ELM behaviour in TCV. A continuous spectrum of ELM amplitudes and frequencies has been observed, ranging from clearly identifiable type III ELMs to large, low-frequency ELMs which expel up to 12% of the stored energy and up to 7% of the particle content and are reminiscent of type I ELMs. A previously unknown, benign kind of ELM, with a maximum amplitude in the divertor region, has also been observed.

日本語訳

TCVトカマクは、イオンのドリフトがX点に向かうほぼすべてのダイバータ配位、およびいくつかのリミター配位において、オーミックHモードを達成した。トロイオン係数は最大2、線平均密度はグリーンワルド限界に相当する値まで達成され、これらはELMフリーのダイバータHモードにおいて得られた。準定常Hモードは、電流フラットトップ全体(1.5秒)にわたって、規則的なELMの存在下で維持された。ELMの発生と大きさは、非平衡ダブルヌル配位における「活性」X点の位置や、シングルヌル配位におけるプラズマ・壁間距離などの配位パラメータに依存することが見出された。これらの依存性により、TCVにおけるELM挙動の能動制御が可能となった。ELMの振幅と周波数には連続的なスペクトルが観測され、明確に識別可能なタイプIII ELMから、蓄積エネルギーの最大12%および粒子含有量の最大7%を放出する、タイプI ELMを思わせる大きな低周波ELMまで及んだ。さらに、ダイバータ領域で最大振幅を示す、これまで知られていなかった無害なタイプのELMも観測された。

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TCVOhmic heating
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