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Measurements of Plasma Jets and Collimated Flux Tubes that are the Precursors of Spheromak Self-organization

Bellan, P. M. and You, S. and Yun, G. S. (2007) Measurements of Plasma Jets and Collimated Flux Tubes that are the Precursors of Spheromak Self-organization. Journal of Fusion Energy, 26 (1-2). pp. 25-29. ISSN 0164-0313. doi:10.1007/s10894-006-9048-z.

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A magnetized planar coaxial plasma gun is used to study the physics of spheromak formation. Eight magnetic flux tubes spanning from the cathode to the anode electrode are first filled with plasma by a rapid MHD pumping mechanism which ingests plasma from nozzles at the wall. The ingested plasma convects toroidal flux and the pile-up of this flux in the flux tube causes the flux tube to become collimated. The eight collimated flux tubes first have the shape of spider legs, but then merge to form a central column jet. This jet lengthens, continuing to ingest plasma from the wall sources, and becomes kink unstable. At a later stage the root of the jet can break off from the electrode and this detachment has been identified as being associated with a sausage instability. The sausage instability takes place during the nonlinear stage of the kinking. The above statements are based on experimental observations and have been reconciled with MHD models.

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Bellan, P. M.0000-0002-0886-8782
Additional Information:© 2006 Springer Science+Business Media, LLC. Published online: 6 December 2006.
Subject Keywords:spheromak; magnetohydrodynamic jet; collimation; kink; sausage
Issue or Number:1-2
Record Number:CaltechAUTHORS:20100503-092637729
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:18095
Deposited By: Tony Diaz
Deposited On:05 May 2010 03:47
Last Modified:08 Nov 2021 23:41

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