Fast wave current drive at high ion cyclotron harmonics on DIII-D
Fast wave current drive at high ion cyclotron harmonics on DIII-D
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DOI：
10.1088/0741-3335/43/12/308
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发表时间：
2001-12
影响因子：
2.2
通讯作者：
C. Petty;F. Baity;J. Degrassie;T. Mau;R. Pinsker;M. Porkolab;R. Prater
中科院分区：
文献类型：
--
作者：
C. Petty;F. Baity;J. Degrassie;T. Mau;R. Pinsker;M. Porkolab;R. Prater
在 DIII-D 托卡马克的相同等离子体中，以氘离子回旋加速器频率的第四和第八谐波测量由快速阿尔文波驱动的电流。在采用中性束注入加热的非锯齿放电中，快波电流驱动 (FWCD) 的径向分布由环路电压分布对同天线和反天线定相的响应决定。与四次谐波情况相比，八次谐波情况的无量纲电流驱动效率高出两倍。使用射线追踪代码对快波吸收进行建模表明，后一种情况下 FWCD 效率的降低可以通过高能离子上快波的高次谐波阻尼来解释。
Current driven by the fast Alfven wave is measured at the fourth and eighth harmonics of the deuterium ion cyclotron frequency in identical plasmas on the DIII-D tokamak. In non-sawtoothing discharges with neutral beam injection heating, the radial profile of the fast wave current drive (FWCD) is determined by the response of the loop voltage profile to co- and counter-antenna phasings. The dimensionless current drive efficiency is a factor of two greater for the eighth harmonic case compared to the fourth harmonic case. Modelling of the fast wave absorption using a ray tracing code shows that the decrease in FWCD efficiency for the latter situation can be explained by high harmonic damping of the fast waves on energetic ions.