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Comparison of high-field-side and low-field-side launch ECCD in the W7-AS stellarator

MPS-Authors
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Romé,  M.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Erckmann,  V.
W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society;

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Maassberg,  H.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Marushchenko,  N. B.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Romé, M., Erckmann, V., Laqua, H. P., Maassberg, H., & Marushchenko, N. B. (2003). Comparison of high-field-side and low-field-side launch ECCD in the W7-AS stellarator. Plasma Physics and Controlled Fusion, 45, 783-792. doi:10.1088/0741-3335/45/5/318.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-3D23-A
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 bounce-averaged 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