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Recent results of LH experiments on the JT-60 tokamak

N Akaoka, H Akasaka, M Akiba, N Akino, T Ando, K Annou, T Aoyagi, T Arai, K Arakawa, M Araki1990年Plasma Physics and Controlled FusionIF 2.2出版社

Recent lower hybrid current drive (LHCD), and heating (LHH) experiments on JT-60 are reported. The current drive product of neRpIRF approximately 12.5*1019 m-2 MA was achieved at the LH power of approximately 4.5 MW, and the CD efficiency, the energy confinement, the global power balance and the heat load on divertor plates were investigated in high power LHCD plasmas. Nearly steady state H-mode discharges were found during LHCD with two different frequency injections. Sawtooth suppression in NB heated plasmas by LHCD have shown an improvement in confinement near the plasma center. Parametric instabilities in LH heating experiments were significantly reduced by increasing the plasma current, and the stored energy increased linearly with heating power of up to approximately 9 MW at ne approximately 7*1019 m-3 and Ip=2.75 MA. Parametric instabilities near the plasma edge in the ion heating regime were also reduced in peaked density plasmas produced by pellet injection and LH waves increased the central plasma pressure at ne(0) > 1.4*1020 m-3.

日本語訳

最近のJT-60における低混成波電流駆動(LHCD)および加熱(LHH)実験について報告する。約4.5 MWの低混成波パワーにおいて、neRpIRF ≈ 12.5×10^19 m^-2・MAの電流駆動積が達成され、高パワーLHCDプラズマにおける電流駆動効率、エネルギー閉じ込め、全体のパワーバランス、およびダイバータ板への熱負荷が調べられた。2つの異なる周波数でのLHCD中に、ほぼ定常状態のHモード放電が見出された。LHCDによるNB加熱プラズマ中の鋸歯状振動の抑制は、プラズマ中心部近傍での閉じ込めの改善を示した。LH加熱実験におけるパラメトリック不安定性は、プラズマ電流の増加により大幅に低減され、蓄積エネルギーは、ne ≈ 7×10^19 m^-3、Ip = 2.75 MAにおいて、最大約9 MWの加熱パワーまで線形に増加した。イオン加熱領域におけるプラズマ端部のパラメトリック不安定性も、ペレット入射により生成されたピーク密度プラズマ中で低減され、LH波は、ne(0) > 1.4×10^20 m^-3において中心プラズマ圧力を増加させた。

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