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Effect of the q(r) profile on electron transport barrier formation in the T-10 tokamak

K A Razumova, V F Andreev, A A Borshchegovskii, V V Chistyakov, S A Grashin, A M Kakurin, A Ya Kislov, D A Krupin, S E Lysenko, V G Merezhkin2003年Plasma Physics and Controlled FusionIF 2.2出版社

The effect of the q(r) profile on transport barrier formation has been investigated in the T-10 tokamak using rapid current ramp-up with electron cyclotron resonance heating (ECRH). The enhanced core confinement (formation of the internal transport barrier (ITB)) arises earlier than the additional current penetrates in the core region. It is suggested that this process takes place due to decrease of magnetic surface density in the region of the rational q = 2 surface due to βp decrease, which is equivalent to dq/dr decrease near q = 2 surface. At various q-profiles, internal and external barriers were observed. Transient confinement improvement inside the ITB after the ECRH switch-off was also observed.

日本語訳

q(r) プロファイルが輸送障壁形成に及ぼす影響が、電子サイクロトロン共鳴加熱 (ECRH) を用いた急速電流立ち上げによって T-10 トカマクにおいて調査された。強化されたコア閉じ込め(内部輸送障壁 (ITB) の形成)は、追加電流がコア領域に浸透するよりも早く発生する。この過程は、βp の減少による有理 q = 2 面領域における磁気面密度の減少に起因して発生することが示唆され、これは q = 2 面近傍での dq/dr の減少に相当する。様々な q プロファイルにおいて、内部および外部障壁が観測された。ECRH 停止後の ITB 内部における過渡的な閉じ込め改善も観測された。

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