Electron cyclotron current drive in low collisionality limit: On parallel momentum conservation
Electron cyclotron current drive in low collisionality limit: On parallel momentum conservation
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DOI：
10.1063/1.3558584
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发表时间：
2011-03
影响因子：
2.2
通讯作者：
N. Marushchenko;C. Beidler;S. Kasilov;W. Kernbichler;H. Maassberg;R. Prater;R. Harvey
中科院分区：
文献类型：
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作者：
N. Marushchenko;C. Beidler;S. Kasilov;W. Kernbichler;H. Maassberg;R. Prater;R. Harvey
本文根据漂移动力学方程中出现的碰撞算子和Vlasov算子的伴随性质，采用伴随技术，对射线和束流跟踪程序中计算电子回旋电流驱动（ECCD）的模型进行了全面的处理。特别注意的是仔细解决伴随漂移动力学方程（广义斯皮策问题）与平行动量守恒的类粒子碰撞。该问题的公式对任意的磁位形都是有效的。这里只考虑低碰撞性的极限，这与高温等离子体有关。结果表明，精确的解决方案的伴随漂移动力学方程与平行动量守恒显着不同（除了超热电子部分），从计算中的高速限制，这是最常用的文献。对于高温等离子体与显着的相对论效应，所得到的数值模型的准确性证明了射线追踪计算和基准结果。结果发现，与平行动量守恒的ITER计算的ECCD效率显着超过与高速极限模型得到的预测。
A comprehensive treatment of the models used in ray- and beam-tracing codes to calculate the electron cyclotron current drive (ECCD) by means of the adjoint technique, based on the adjoint properties of the collision and Vlasov operators appearing in the drift-kinetic equation, is presented. Particular attention is focused on carefully solving the adjoint drift-kinetic equation (generalized Spitzer problem) with parallel momentum conservation in the like-particle collisions. The formulation of the problem is valid for an arbitrary magnetic configuration. Only the limit of low collisionality is considered here, which is of relevance for high-temperature plasmas. It is shown that the accurate solution of the adjoint drift-kinetic equation with parallel momentum conservation significantly differs (apart from the suprathermal electron portion) from that calculated in the high-speed-limit, which is most commonly used in the literature. For high-temperature plasmas with significant relativistic effects, the accuracy of the resulting numerical models is demonstrated by ray-tracing calculations and benchmark results are presented. It is found that the ECCD efficiency calculated for ITER with parallel momentum conservation significantly exceeds the predictions obtained with the high-speed-limit model.