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  A new plasma condensation phenomenon in the W7-AS island divertor

Wenzel, U., McCormick, K., Narayanan, R., Grigull, P., & König, R. (2003). A new plasma condensation phenomenon in the W7-AS island divertor. Journal of Nuclear Materials, 313-316, 1098-1102. doi:10.1016/S0022-3115(02)01545-3.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-232F-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-FE65-6
Genre: Journal Article

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 Creators:
Wenzel, U.1, Author              
McCormick, K.2, 3, Author              
Narayanan, R.4, Author              
Grigull, P.5, Author              
König, R.5, Author              
Affiliations:
1Plasma Diagnostics Group (HUB), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856324              
2Stellarator Scenario Development (E5), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856285              
3W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856310              
4Experimental Plasma Physics 4 (E4), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856293              
5W7-X: Physics (PH), Max Planck Institute for Plasma Physics, Max Planck Society, ou_1856305              

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Free keywords: 15th International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 15), Gifu, 2002-05-26 to 2002-05-31
 Abstract: In the W7-AS stellerator with island divertor very high densities can be achieved in the high-density H-mode. As a consequence, the plasma in the divertor detaches as previously shown by the reduction of the particle flux at some strike point positions and an upward movement of the ionisation front. Our spectroscopic measurements prove the simultaneous formation of a high-density (8×10²⁰ m⁻³), low temperature (0.2 eV) region at the detachment transition in the divertor on top. This plasma is strongly recombining, as a result a strong up/down pressure asymmetry develops. Since flux amplification at the strike points was not found in the island divertor, we suppose that a nonlinear thermal condensation instability leads to the observed high-density region.

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Language(s): eng - English
 Dates: 2003
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Degree: -

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Title: Journal of Nuclear Materials
  Alternative Title : J. Nucl. Mater.
Source Genre: Journal
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Publ. Info: Copyright © 2003 Elsevier Science B.V. All rights reserved
Pages: - Volume / Issue: 313-316 Sequence Number: - Start / End Page: 1098 - 1102 Identifier: -