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Influence of radial electric fields on the heating efficiency of neutral beam injection in the W7-AS stellarator

A Teubel, F -P Penningsfeld1994年Plasma Physics and Controlled FusionIF 2.2出版社

A version of the FAFNER neutral beam injection code that takes a radial electric field into account is applied to the W7-AS stellarator. The influence of the strength and radial profile of an assumed electric field is studied with respect to heating profiles and global efficiency. The resulting profiles decisively depend on the electric field profile in contrast to the global efficiency. With increasing electric potential (from -5 kV to +5 kV) the heating efficiency decreases for co-injection and increases for counter-injection. This is different to the corresponding ODIN results obtained for the W7-A stellarator, where the confinement of fast ions was strongly enhanced by negative as well as positive electric potentials. These differences are mainly caused by the different beam injection geometries in these devices: perpendicular in W7-A and tangential in W7-AS.

日本語訳

動径電場を考慮したFAFOR中性粒子ビーム入射コードの一バージョンをW7-ASステラレータに適用した。仮定した電場の強度と動径分布が、加熱プロファイルと全体効率に及ぼす影響を調べた。得られたプロファイルは、全体効率とは対照的に、電場プロファイルに決定的に依存する。電位を増加させる(-5 kVから+5 kV)と、加熱効率はコインジェクションでは減少し、カウンターインジェクションでは増加する。これは、W7-Aステラレータで得られた対応するODIN結果とは異なる。そこでは、高速イオンの閉じ込めは負および正の電位によって強く増強された。これらの違いは、主にこれらの装置におけるビーム入射幾何学の違い、すなわちW7-Aでは垂直入射、W7-ASでは接線入射によるものである。

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StellaratorNeutral beamNeutral beam injectionRadial electric fieldW7-AS
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