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Journal Article

Wall conditioning for Wendelstein 7-X by glow discharge

MPS-Authors
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Spring,  A.
W7-X: Construction, Max Planck Institute for Plasma Physics, Max Planck Society;

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Brakel,  R.
Experimental Plasma Physics 3 (E3), Max Planck Institute for Plasma Physics, Max Planck Society;

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Niedermeyer,  H.
W7-X: Construction, Max Planck Institute for Plasma Physics, Max Planck Society;

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Citation

Spring, A., Brakel, R., & Niedermeyer, H. (2003). Wall conditioning for Wendelstein 7-X by glow discharge. Fusion Engineering and Design, 66-68, 371-375. doi:10.1016/S0920-3796(03)00245-X.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-3F14-B
Abstract
The basic design of a reliable and robust glow discharge cleaning (GDC) system for Wendelstein 7-X is presented. Preliminary experiments at the DEMO cryostat, a full size prototype sector of W7-X, result in conclusions about the operating range, power consumption and discharge stability of a GDC in W7-X dimensions. Ten electrodes are planned to be integrated into the first wall of W7-X, thus avoiding complex manipulators. A spherical calotte anode made of graphite mounted in a shielding trough was found as the optimum electrode design assuring stable discharge operation without active cooling, even when exposed to steady state stellarator discharges.