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High-harmonic ICRF heating experiments in JT-60

H Kimura, T Fujii, M Saigusa, S Moriyama, K Hamamatsu, M Nemoto, K Tobita1993年Plasma Physics and Controlled FusionIF 2.2出版社

A review of the results from JT-60 ICRF heating experiments is presented. The JT-60 ICRF experiments (120 and 131 MHz) are characterized by higher-harmonic heating with phase control of the compact 2*2 loop antenna array. Second-harmonic heating is most intensively investigated with antenna phase control for various cases where the resonant species (hydrogen) are either a majority component or a minority component, and with or without hydrogen HBI heating. It is found that antenna phase control plays a key role in optimizing antenna power injection characteristics as well as heating efficiency. The out-of-phase mode (( pi ,0) mode) can avoid RF sheath and parametric decay instabilities which cause harmful effects on antenna power injection capability with the in-phase mode ((0,0 ) mode) is some operating conditions. The incremental energy confinement time ( tau Einc) of the ( pi ,0) mode is about 50% better than that of the (0,0) mode. Minority hydrogen second-harmonic heating with ( pi ,0) phasing in helium discharges shows the best results over a wide range of electron densities (ne=2.5-6.5*1019 m-3) and plasma currents (Ip=1.5-2.4 MA (qa=4.2-2.6)). The best confinement enhancement factor ( tau E/ tau E(L-mode)) is 1.3, which is obtained with ohmic target plasmas. Higher-harmonic beam ion acceleration is observed up to fourth harmonics in a combined ICRF (( pi ,0) mode) and NBI heating scenario. Strong central-electron heating associated with beam ion acceleration is observed in combined third-harmonic ICRF and NBI heating.

日本語訳

JT-60 ICRF加熱実験の結果についてのレビューを提示する。JT-60 ICRF実験(120および131 MHz)は、コンパクトな2×2ループアンテナアレイの位相制御を伴う高次高調波加熱を特徴とする。第2高調波加熱は、共鳴種(水素)が主成分または少数成分であるさまざまな場合について、アンテナ位相制御を用いて最も集中的に調査された。アンテナ位相制御は、アンテナ電力入射特性および加熱効率の最適化において重要な役割を果たすことが見出された。逆位相モード((π,0)モード)は、同位相モード((0,0)モード)において特定の運転条件下で有害な影響を引き起こすRFシースおよびパラメトリック崩壊不安定性を回避することができる。(π,0)モードの増分エネルギー閉じ込め時間(τ_E_inc)は、(0,0)モードよりも約50%優れている。ヘリウム放電における(π,0)位相での少数水素第2高調波加熱は、広範囲の電子密度(n_e=2.5-6.5×10^19 m^-3)およびプラズマ電流(I_p=1.5-2.4 MA(q_a=4.2-2.6))にわたって最良の結果を示す。最良の閉じ込め改善係数(τ_E/τ_E(Lモード))は1.3であり、これはオーミック標的プラズマで得られた。高調波ビームイオン加速は、ICRF((π,0)モード)とNBI加熱の組み合わせシナリオにおいて第4高調波まで観測された。ビームイオン加速に伴う強い中心電子加熱は、第3高調波ICRFとNBI加熱の組み合わせにおいて観測された。

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Ion cyclotron heatingJT-60
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