Theory of edge plasma in a spheromak

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Properties of the edge plasma in the SSPX spheromak during the plasma formation and sustainment phases are discussed. For the breakdown and formation phase, the main emphasis is on the analysis of possible plasma contamination by impurities from the electrodes of the plasma gun (helicity injector). The issue of an azimuthally uniform breakdown initiation is also discussed. After the plasma settles down in the main vacuum chamber, one has to sustain the current between the electrodes, in order to continuously inject helicity. We discuss properties of the plasma on the field lines intersecting the electrodes. We conclude that the thermal ... continued below

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Hooper, E.B., LLNL May 1, 1998.

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Description

Properties of the edge plasma in the SSPX spheromak during the plasma formation and sustainment phases are discussed. For the breakdown and formation phase, the main emphasis is on the analysis of possible plasma contamination by impurities from the electrodes of the plasma gun (helicity injector). The issue of an azimuthally uniform breakdown initiation is also discussed. After the plasma settles down in the main vacuum chamber, one has to sustain the current between the electrodes, in order to continuously inject helicity. We discuss properties of the plasma on the field lines intersecting the electrodes. We conclude that the thermal balance of this plasma is maintained by Joule heating competing with parallel heat losses to the electrodes. The resulting plasma temperature is in the range of 15 - 30 eV. Under the expected operational conditions, the ``current`` velocity of the electrons is only slightly below their thermal velocity. Implications of this observation are briefly discussed.

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Medium: P; Size: 17 p.; Other: FDE: PDF; PL:

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INIS; OSTI as DE98058849

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  • 13. international conference on plasma surface interactions, San Diego, CA (United States), 18-22 May 1998

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  • Other: DE98058849
  • Report No.: UCRL-JC--130767
  • Report No.: CONF-980560--
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 292445
  • Archival Resource Key: ark:/67531/metadc679785

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  • May 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • Feb. 23, 2016, 12:39 p.m.

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Hooper, E.B., LLNL. Theory of edge plasma in a spheromak, article, May 1, 1998; California. (digital.library.unt.edu/ark:/67531/metadc679785/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.