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Lower hybrid experiments in the ASDEX tokamak

F Leuterer, F Soldner, D Eckhartt, A Eberhagen, A Giuliana, H Murmann, F Ryter, R Bartiromo, G Becker, K Bernhardi1985年Plasma Physics and Controlled FusionIF 2.2出版社

Interaction of lower hybrid waves at 1.3 GHz with ions and electrons was studied in the density range 0.2-5*1013 cm-3 in the ASDEX tokamak. At high densities, ne>or approximately=4*1013 cm-3, fast ions with mainly perpendicular velocities are produced by the RF power at the plasma periphery. They are not well confined and do not lead to any bulk plasma heating. At lower densities, 2*1013<or approximately=ne<or approximately=4*1013 cm-3, electron and ion heating is observed. The heating is better in deuterium than in hydrogen plasmas. At very low densities, ne<or approximately=2*1013 cm-3, the discharge becomes suprathermal as soon as the RF power is switched on. Launching an asymmetric spectrum of waves in a low density plasma leads to the generation of an RF-driven DC-plasma current.

日本語訳

1.3 GHzの低混成波とイオンおよび電子との相互作用を、ASDEXトカマクにおいて密度範囲0.2〜5×10¹³ cm⁻³で研究した。高密度域(ne≧約4×10¹³ cm⁻³)では、主として垂直速度成分を持つ高速イオンがプラズマ周辺部でRFパワーにより生成される。これらのイオンは良好に閉じ込められず、バルクプラズマの加熱には寄与しない。低密度域(2×10¹³≦ne≦約4×10¹³ cm⁻³)では、電子加熱とイオン加熱の両方が観測される。加熱は水素プラズマよりも重水素プラズマにおいてより効果的である。極低密度域(ne≦約2×10¹³ cm⁻³)では、RFパワーが投入されると直ちに放電は超熱的(非熱的)状態となる。低密度プラズマにおいて非対称な波スペクトルを入射すると、RF駆動による直流プラズマ電流の生成がもたらされる。

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