The electron cyclotron current drive (ECCD) with extraordinary mode at the second cyclotron harmonic launched from the high-field-side (HFS) is investigated in W7-AS stellarator. Trapped particle effects and quasi-linear effects are taken into account in linear ray-tracing and quasi-linear bounceaveraged Fokker–Planck computations of the driven current. The results for both low-field-side (LFS) and HFS injection in W7-AS are compared with the experimental results. A slightly lower current drive efficiency is obtained, both theoretically and experimentally, in the case of HFS injection, confirming the LFS launch as the preferred mode of operation for ECCD.
Comparison of high-field-side and low-field-side launch ECCD in the W7-AS Stellarator / M. Romé, V. Erckmann, H. P. Laqua, H. Maassberg, N. B. Marushchenko. - In: PLASMA PHYSICS AND CONTROLLED FUSION. - ISSN 0741-3335. - 45:5(2003), pp. 783-792. [10.1088/0741-3335/45/5/318]
Comparison of high-field-side and low-field-side launch ECCD in the W7-AS Stellarator
M. Romé;
2003
Abstract
The electron cyclotron current drive (ECCD) with extraordinary mode at the second cyclotron harmonic launched from the high-field-side (HFS) is investigated in W7-AS stellarator. Trapped particle effects and quasi-linear effects are taken into account in linear ray-tracing and quasi-linear bounceaveraged Fokker–Planck computations of the driven current. The results for both low-field-side (LFS) and HFS injection in W7-AS are compared with the experimental results. A slightly lower current drive efficiency is obtained, both theoretically and experimentally, in the case of HFS injection, confirming the LFS launch as the preferred mode of operation for ECCD.
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