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Cross-beam energy transfer saturation: ion heating and pump depletion

A M Hansen, K L Nguyen, D Turnbull, B J Albright, R K Follett, R Huff, J Katz, D Mastrosimone, A L Milder, L Yin2022年Plasma Physics and Controlled FusionIF 2.2出版社

Cross-beam energy transfer (CBET) was measured in two regimes where the energy transfer saturation mechanism was determined by the plasma and laser beam conditions. Linear kinetic CBET theory agrees well with the measured energy transfer in all experimental configurations and at all probe beam intensities when accounting for pump depletion and the plasma conditions measured using Thomson-scattering. Simultaneous CBET and Thomson-scattering measurements enabled uncertainties in the plasma conditions to be isolated from CBET theory, which allowed the saturation mechanisms to be identified. In the perpendicular-beam configuration the saturation mode was through ion heating, which resulted from ion trapping in the driven waves and subsequent ion-ion collisional heating. In the co-propagating beam configuration there was minimal ion heating and the saturation mode was through pump depletion.

日本語訳

交差ビームエネルギー輸送(CBET)は、エネルギー飽和機構がプラズマ条件とレーザービーム条件によって決定される2つの領域で測定された。線形CBET理論は、ポンプ波の消耗とトムソン散乱を用いて測定されたプラズマ条件を考慮した場合、すべての実験構成およびすべてのプローブビーム強度において、測定されたエネルギー輸送とよく一致する。CBETとトムソン散乱の同時測定により、プラズマ条件の不確かさをCBET理論から分離することが可能となり、飽和機構の特定が可能となった。垂直ビーム構成では、飽和機構はイオン加熱であり、これは駆動波におけるイオン捕捉と、それに続くイオン-イオン衝突による加熱に起因する。共伝播ビーム構成では、イオン加熱は最小限であり、飽和機構はポンプ波の消耗であった。

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Ion heating
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