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Calculation of RF sheath properties from surface wave-fields: a post-processing method

J R Myra, H Kohno2019年Plasma Physics and Controlled FusionIF 2.2出版社

In ion cyclotron range of frequency (ICRF) experiments in fusion research devices, radio frequency (RF) sheaths form where plasma, strong RF wave fields and material surfaces coexist. These RF sheaths affect plasma material interactions such as sputtering and localized power deposition, as well as the global RF wave fields themselves. RF sheaths may be modeled by employing a sheath boundary condition (BC) in place of the more customary conducting wall (CW) BC; however, there are still many ICRF computer codes that do not implement the sheath BC. In this paper we present a method for post-processing results obtained with the CW-BC. The post-processing method produces results that are equivalent to those that would have been obtained with the RF sheath BC, under certain assumptions. The post-processing method is also useful for verification of sheath BC implementations and as a guide to interpretation and understanding of the role of RF sheaths and their interactions with the waves that drive them.

日本語訳

核融合研究装置におけるイオンサイクロトロン周波数帯(ICRF)実験では、強力なRF波場と材料表面が共存する領域において、高周波(RF)シースが形成される。これらのRFシースは、スパッタリングや局所的な電力堆積などのプラズマ・材料相互作用、さらにはグローバルなRF波場自体に影響を及ぼす。RFシースは、より一般的な導体壁(CW)境界条件の代わりにシース境界条件(BC)を採用することでモデル化され得るが、シースBCを実装していないICRF計算コードは依然として数多く存在する。本論文では、CW-BCを用いて得られた結果を後処理する手法を提示する。この後処理手法は、特定の仮定の下で、RFシースBCを用いて得られたであろう結果と等価な結果を生成する。また、この後処理手法は、シースBC実装の検証や、RFシースとそれを駆動する波との相互作用の解釈・理解のための指針としても有用である。

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