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The effects of the scattering by edge plasma density fluctuations on lower hybrid wave propagation

N Bertelli, G Wallace, P T Bonoli, R W Harvey, A P Smirnov, S G Baek, R R Parker, C K Phillips, E J Valeo, J R Wilson2013年Plasma Physics and Controlled FusionIF 2.2出版社

Scattering effects induced by edge density fluctuations on lower hybrid (LH) wave propagation are investigated. The scattering model used here is based on the work of Bonoli and Ott (1982 Phys. Fluids25 361). It utilizes an electromagnetic wave kinetic equation solved by a Monte Carlo technique. This scattering model has been implemented in GENRAY, a ray-tracing code which explicitly simulates wave propagation, as well as collisionless and collisional damping processes, over the entire plasma discharge, including the scrape-off layer that extends from the separatrix to the vessel wall. A numerical analysis of the LH wave trajectories and the power deposition profile with and without scattering is presented for Alcator C-Mod discharges. Comparisons between the measured hard x-ray emission on Alcator C-Mod and simulations of the data obtained from the synthetic diagnostic included in the GENRAY/CQL3D package are shown, with and without the combination of scattering and collisional damping. Implications of these results on LH current drive are discussed.

日本語訳

端部密度揺らぎが低域混成(LH)波伝播に及ぼす散乱効果を調査する。ここで用いる散乱モデルは、Bonoli と Ott(1982 Phys. Fluids 25 361)の研究に基づくものである。これは、モンテカルロ法により解かれる電磁波の運動論的方程式を利用する。この散乱モデルは、セパラトリックスから真空容器壁まで及ぶスクレイプオフ層を含むプラズマ全体にわたり、波の伝播ならびに無衝突減衰および衝突減衰過程を明示的にシミュレートする光線追跡コード GENRAY に実装されている。Alcator C-Mod 放電について、散乱の有無による LH 波の軌道と電力堆積分布の数値解析を示す。GENRAY/CQL3D パッケージに含まれる合成診断から得られたデータのシミュレーションと、Alcator C-Mod における測定硬 X 線放射との比較を、散乱と衝突減衰の組み合わせの有無について示す。これらの結果が LH 電流駆動に及ぼす影響について議論する。

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alcator-c-mod中精度(概要文一致)

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Lower hybridEdge plasmaDensity fluctuation
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