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Electron cyclotron emission in Alcator tokamak

I.H. Hutchinson, D.S. Komm1977年被引用 88Nuclear FusionIF 3出版社

Radial observations of emission in the vicinity of the electron cyclotron frequency and its harmonics show the radiation to be polarized; ratio of extraordinary to ordinary mode intensity of about 2:1. In the thermal spectra the effects of cold-plasma resonances upon propagation of the radiation from emission layer to observation point are evident: (i) The extraordinary mode first harmonic is always suppressed by the upper hybrid resonance layer; (ii) The ordinary-mode first harmonic is suppressed when the plasma frequency exceeds the cyclotron frequency; (iii) For sufficiently high density the second harmonic is also affected by the hybrid cut-off. In the non-thermal spectrum the broad-band emission is polarized at high frequency but not at lower. The feature in the vicinity of the plasma frequency at intermediate density is broader than previously observed and almost entirely above ωpe. Internal sawtooth relaxations have been observed in the central temperature even up to peak densities of 7 × 1020 m−3. Temperature profiles deduced from second harmonic cyclotron emission and Thompson scattering data are compared.

日本語訳

電子サイクロトロン周波数およびその高調波近傍における放射の動径方向観測は、放射が偏光していることを示している。異常波と正常波の強度比は約2:1である。熱スペクトルにおいて、放射層から観測点までの放射伝播に対する冷プラズマ共鳴の影響が明らかである:(i) 異常波の第1高調波は常に上部混成共鳴層によって抑制される。(ii) 正常波の第1高調波は、プラズマ周波数がサイクロトロン周波数を超えると抑制される。(iii) 十分に高い密度では、第2高調波も混成遮断の影響を受ける。非熱スペクトルでは、広帯域放射は高周波数では偏光するが、低周波数では偏光しない。中間密度におけるプラズマ周波数近傍の特徴は、これまで観測されたものよりも広く、ほぼ完全にωpeを超えている。内部の鋸歯状緩和は、ピーク密度が7×10^20 m^-3に達するまで中心温度に観測されている。第2高調波サイクロトロン放射から推定された温度分布と、トムソン散乱データから推定された温度分布を比較する。

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AlcatorElectron cyclotron emission
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