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Lower hybrid wave scattering and turbulent electron heating at the WIIA-stellarator

L Schmitz, G Derra, G Luthen, H Schluter1986年Plasma Physics and Controlled FusionIF 2.2出版社

The propagation of lower hybrid waves in the presence of large amplitude drift wave fluctuations has been investigated in a 1=2 stellarator (B<or=0.3 T, ne<or=5.1017 m-3, delta ne/ne<or=0.6). Severe decorrelation of the wave as well as considerable broadening of the perpendicular wavenumber spectrum with a nearly isotropic distribution is found. Strong damping of the LH-wave is observed, which cannot be attributed to collisions or electron Landau damping. High power LH-waves are shown to heat the electrons efficiently. The energy transfer from the turbulent LH-spectrum to the electrons is accounted for by an effective collision frequency nu eeff(kperpendicular to )=Dtperpendicular to kperpendicular to 2. An electron energy balance demonstrates that turbulent heating is by far dominant. Reasonable agreement between the observed heating and the power transfer from the turbulent spectrum is obtained if Dtperpendicular to is estimated from the properties of the drift wave spectra.

日本語訳

低混成波の伝播が、大きな振幅のドリフト波ゆらぎの存在下で、1=2ステラレータ(B≤0.3 T、ne≤5.1017 m-3、δne/ne≤0.6)において調査された。波の著しい非相関化と、ほぼ等方的な分布を伴う垂直波数スペクトルのかなりの広がりが見出された。LH波の強い減衰が観測されたが、これは衝突または電子ランダウ減衰に帰することはできない。高パワーLH波は電子を効率的に加熱することが示された。乱流的LHスペクトルから電子へのエネルギー移動は、実効衝突周波数νe^eff(k⊥)=Dt⊥k⊥²によって説明される。電子エネルギー収支は、乱流加熱が圧倒的に支配的であることを示している。観測された加熱と乱流スペクトルからのパワー移動との間には、Dt⊥がドリフト波スペクトルの特性から推定される場合、合理的な一致が得られる。

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StellaratorLower hybridElectron heating
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