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Large density amplification measured on jets ejected from a magnetized plasma gun

Yun, Gunsu S. and You, Setthivoine and Bellan, Paul M. (2007) Large density amplification measured on jets ejected from a magnetized plasma gun. Nuclear Fusion, 47 (3). pp. 181-188. ISSN 0029-5515. doi:10.1088/0029-5515/47/3/003.

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Observation of a large density amplification in the collimating plasma jet ejected from a coplanar coaxial plasma gun is reported. The jet velocity is ~30 km s^-1 and the electron density increases from ~10^20 to 10^(22–23) m^-3. In previous spheromak experiments, electron density of the order 10^(19–21) m^-3 had been measured in the flux conserver region, but no density measurement had been reported for the source gun region. The coplanar geometry of our electrodes permits direct observation of the entire plasma dynamics including the source region. Analysis of Stark broadened spectral lines shows that the electron density increases by a factor of 100 as the jet collimates, with a peak density of up to 10^(22–23) m^-3. The observed density amplification is interpreted according to an MHD theory that explains collimation of current-carrying plasma-filled magnetic flux tubes. Issues affecting interpretation of Stark broadened line profiles and the possibility of using the high-density plasma jet for tokamak fuel injection are discussed.

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Bellan, Paul M.0000-0002-0886-8782
Additional Information:© Institute of Physics and IOP Publishing Limited 2007. Received 18 August 2006, accepted for publication 8 January 2007. Published 5 February 2007. Print publication: Issue 3 (March 2007). This work was supported by US DoE Grant DE-FG02-04ER54755.
Issue or Number:3
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7369
Deposited By: Archive Administrator
Deposited On:06 Feb 2007
Last Modified:12 Jul 2022 19:40

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