Some estimates of mirror plasma startup by neutral beam heating of pellet and gas cloud targets

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Hot plasma buildup by neutral beam injection into an initially cold solid or gaseous target is found to be conceivable in large mirror machine experiments such as 2XIIB or MFTF. A simple analysis shows that existing neutral beam intensities are sufficient to ablate suitable targets to form a gas or vapor cloud. An approximate rate equation model is used to follow the subsequent processes of ionization, heating, and hot plasma formation. Solutions of these rate equations are obtained by means of the ''GEAR'' techniques for solving ''stiff'' systems of differential equations. These solutions are in rough agreement with the 2XIIB ... continued below

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Pages: 35

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Shearer, J.W. & Willmann, P.A. July 7, 1978.

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Hot plasma buildup by neutral beam injection into an initially cold solid or gaseous target is found to be conceivable in large mirror machine experiments such as 2XIIB or MFTF. A simple analysis shows that existing neutral beam intensities are sufficient to ablate suitable targets to form a gas or vapor cloud. An approximate rate equation model is used to follow the subsequent processes of ionization, heating, and hot plasma formation. Solutions of these rate equations are obtained by means of the ''GEAR'' techniques for solving ''stiff'' systems of differential equations. These solutions are in rough agreement with the 2XIIB stream plasma buildup experiment. They also predict that buildup on a suitable nitrogen-like target will occur in the MFTF geometry. In 2XIIB the solutions are marginal; buildup may be possible, but is not certain.

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Pages: 35

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Dep. NTIS, PC A03/MF A01.

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  • Report No.: UCID-17845
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/6677270 | External Link
  • Office of Scientific & Technical Information Report Number: 6677270
  • Archival Resource Key: ark:/67531/metadc1191970

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • July 7, 1978

Added to The UNT Digital Library

  • July 3, 2018, 8:14 a.m.

Description Last Updated

  • Nov. 6, 2018, 1:15 p.m.

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Shearer, J.W. & Willmann, P.A. Some estimates of mirror plasma startup by neutral beam heating of pellet and gas cloud targets, report, July 7, 1978; United States. (digital.library.unt.edu/ark:/67531/metadc1191970/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.