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Enhancement of confinement in tokamaks

H P Furth1986年Plasma Physics and Controlled FusionIF 2.2出版社

A plausible interpretation of the experimental evidence is that energy confinement in tokamaks is governed by two separate considerations: (1) the need for resistive MHD kink-stability, which limits the permissible range of current profiles-and therefore normally also the range of temperature profiles; and (2) the presence of strongly anomalous microscopic energy transport near the plasma edge, which calibrates the amplitude of the global temperature profile, thus determining the energy confinement time tau E. The present analysis begins by identifying a hypothetical model of tokamak confinement that is designed to take into account the conflict between Te(r)-profile shapes arising from microscopic transport and J(r)-profile shapes required for gross stability. On the basis of this model, a number of hypothetical lines of advance are developed. Some TFTR experiments that may point the way to a particularly attractive type of tokamak reactor regime are discussed.

日本語訳

トカマクにおけるエネルギー閉じ込めが、二つの別個の考慮事項によって支配されているという実験的証拠の妥当な解釈は、次の通りである:(1) 抵抗性MHDキンク安定性の必要性。これは電流分布—したがって通常は温度分布も—の許容範囲を制限する;(2) プラズマ端部近傍における強い異常エネルギー輸送の存在。これは全体の温度分布の振幅を較正し、したがってエネルギー閉じ込め時間τ_Eを決定する。本解析は、トカマク閉じ込めの仮説モデルを同定することから始まる。このモデルは、巨視的安定性に要求されるJ(r)分布形状と、微視的輸送から生じるT_e(r)分布形状との間の矛盾を考慮に入れるように設計されている。このモデルに基づき、いくつかの仮説的な前進経路が展開される。特に魅力的なトカマク炉心領域への道筋を示す可能性のあるいくつかのTFTR実験について議論する。

装置

tftr中精度(概要文一致)
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