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Experimental investigation of the ripple induced losses of perpendicularly injected beam ions in the low aspect ratio helical system CHS

M. Isobe, M. Sasao, S. Okamura, T. Kondo, S. Murakami, T. Minami, S. Kado, K. Ida, A. Shimizu, M. Osakabe2001年被引用 18Nuclear FusionIF 3出版社

Confinement of perpendicularly injected beam ions has been investigated experimentallyboth in the standard configuration and in the drift optimized configuration of theCHS heliotron/torsatron by means of the neutron technique. The experimental resultsindicate that the confinement of trapped beam ions is poor in both configurations. Theobserved loss rate of trapped beam ions was very high and this high rate is not explainedby losses due to charge exchange or collisional scattering from the timescale perspective.Full gyro-motion following orbit calculations showed that in the peripheralregion of CHS plasmas, trapped beam ions are promptly lost because they immediatelyintersect the vacuum chamber wall due to their large Larmor radii. It also suggested thatin the core domain the collisionless transition behaviour is the key to understanding the rapid lossof beam ions. It was shown that the magnetic moment of perpendicularly injected beamions is not well conserved in CHS. The rapid losses of perpendicularly injected beamions are probably due to non-adiabatic effects resulting in the transition behaviour of energeticions.

日本語訳

CHSヘリオトロン/トルサトロンにおいて、標準配位およびドリフト最適化配位の両方で、垂直入射ビームイオンの閉じ込めが中性子法により実験的に調査された。実験結果は、捕捉ビームイオンの閉じ込めが両配位において不良であることを示している。観測された捕捉ビームイオンの損失率は非常に高く、この高い損失率は時間スケールの観点から電荷交換または衝突散乱による損失では説明されない。完全ジャイロ運動追跡軌道計算により、CHSプラズマの周辺領域では、捕捉ビームイオンはその大きなラーモア半径のために直ちに真空容器壁と交差するため、即座に失われることが示された。また、コア領域では、無衝突遷移挙動がビームイオンの急速な損失を理解する鍵であることが示唆された。垂直入射ビームイオンの磁気モーメントはCHSにおいて十分に保存されないことが示された。垂直入射ビームイオンの急速な損失は、おそらく高エネルギーイオンの遷移挙動をもたらす非断熱効果によるものである。

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Beam ionCompact Helical SystemHelical system
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