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Adverse Consequences of a Moving Vacuum-Plasma Boundary on Axisymmetric ac Helicity Injection

Bellan, P. M. (1986) Adverse Consequences of a Moving Vacuum-Plasma Boundary on Axisymmetric ac Helicity Injection. Physical Review Letters, 57 (19). pp. 2383-2386. ISSN 0031-9007. doi:10.1103/PhysRevLett.57.2383.

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The recent prediction of Liewer, Gould, and Bellan that a moving plasma-vacuum boundary significantly lowers the effectiveness of ac helicity injection is generalized by resolution of the apparent discrepancy between the helicity-conservation equations of Jensen and Chu and of Moffatt. It is shown that, if there are axisymmetric circular flux surfaces and a moving vacuum-plasma boundary, then the helicity injected by oscillating fields (if net injection occurs) is simply consumed by an increase in helicity dissipation due to the same oscillating fields.

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Bellan, P. M.0000-0002-0886-8782
Additional Information:© 1986 The American Physical Society. Received 18 June 1986. It is a pleasure to acknowledge useful discussions with R.W. Gould, M.S. Schalit, and P.C. Liewer. This work was supported by the National Science Foundation under Grant No. ECS-8414541.
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Issue or Number:19
Record Number:CaltechAUTHORS:BELprl86
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ID Code:9346
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Deposited On:14 Dec 2007
Last Modified:08 Nov 2021 20:58

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