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Heating experiments in the ion cyclotron range of frequencies on EBT-S

T.L. Owens, J.H. Mullen, F.W. Baity, W.A. Davis, O.C. Eldridge, D.L. Hillis1983年被引用 21Nuclear FusionIF 3出版社

Heating experiments in EBT-S have been conducted in steady-state plasmas at continuous wave power levels up to 20 kW in the ion cyclotron range of frequencies (15–30 MHz). Power coupling efficiencies and wave propagation measurements have been obtained at reduced power levels over the frequency range 15–50 MHz. Wave dispersion properties are in qualitative agreement with simplified theory. Substantial ion heating is obtained in deuterium plasmas above 25 MHz, the point at which wave propagation begins. At this frequency, only the 3rd-10th ion cyclotron harmonics of deuterium are present in the core plasma. Ion heating under these circumstances is considerably greater than theoretically predicted for EBT-S parameters. A residual proton component is also heated. However, collisional energy transfer from the protons to the deuterons is too small to account for the deuteron heating. The stored energy of the relativistic electron annuli increases substantially with the application of wave power. Near the antenna, the stored energy more than doubles at a power level of 15 kW. The mechanism producing this dramatic effect is not well understood at present. A small reduction in the ambipolar electric field is also observed during wave heating.

日本語訳

EBT-Sにおける加熱実験は、イオンサイクロトロン周波数帯域(15~30 MHz)の連続波電力レベル最大20 kWの定常状態プラズマにおいて実施された。電力結合効率と波動伝播測定は、15~50 MHzの周波数範囲において低減された電力レベルで得られた。波動分散特性は、簡略化された理論と定性的に一致している。波動伝播が始まる25 MHz以上で、重水素プラズマにおいて実質的なイオン加熱が得られた。この周波数では、重水素の第3次から第10次イオンサイクロトロン高調波のみがコアプラズマ中に存在する。この状況下でのイオン加熱は、EBT-Sパラメータに対して理論的に予測されたものよりかなり大きい。残留陽子成分も加熱される。しかし、陽子から重陽子への衝突エネルギー移動は、重陽子加熱を説明するには小さすぎる。相対論的電子リングの蓄積エネルギーは、波動電力の印加により大幅に増加する。アンテナ近傍では、蓄積エネルギーは15 kWの電力レベルで2倍以上になる。この劇的な効果を生み出すメカニズムは、現在のところ十分に理解されていない。波動加熱中に、両極性電場のわずかな減少も観測される。

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Ion cyclotron heating
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