EXPERIMENTAL RESULTS ON TRAPPING A GUN PLASMA IN A TOROIDAL MAGNETIC CUSP EXPERIMENT

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A start-up method for producing a plasma in the bi-cusp field configuration of a toroidal magnetic cusp (TORMAC) is described. The method uses the radial injection and trapping of a toroidal gun plasma. Measurements of an injected plasma with a velocity of 17 {micro}sec{sup -1} and 4.5 x 10{sup 18} particles is presented. The plasma was observed to be stopped and trapped in an equilibrium position. A well-defined outer boundary remained stationary for 20 {micro}sec. Particle flux distribution emanating from the cusp field lines defined a sheath having a width of 1-1.5 ion gyroradii in the poloidial field. This translates ... continued below

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47 p.

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Pincosy, P.A.; Myers, B.R.; Levine, M.A.; Feinberg, B.; Niland, R.A. & Soroka, L. November 1, 1983.

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A start-up method for producing a plasma in the bi-cusp field configuration of a toroidal magnetic cusp (TORMAC) is described. The method uses the radial injection and trapping of a toroidal gun plasma. Measurements of an injected plasma with a velocity of 17 {micro}sec{sup -1} and 4.5 x 10{sup 18} particles is presented. The plasma was observed to be stopped and trapped in an equilibrium position. A well-defined outer boundary remained stationary for 20 {micro}sec. Particle flux distribution emanating from the cusp field lines defined a sheath having a width of 1-1.5 ion gyroradii in the poloidial field. This translates to a narrow outer boundary and a broad inner boundary based on the gradient of the poloidial field at the two radial positions. Measurements of Thomson scattering and interferometry give a T{sub e} of 15eV, a 15 {micro}sec density decay time, and a 5 {micro}sec energy decay time. These results show that this injection and trapping method is successful, and thus a higher gun plasma energy combined with a flux conserving barrier may lead to higher temperatures for testing containment in TORMAC.

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47 p.

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  • Journal Name: Journal of Plasma Physics; Journal Volume: 32; Journal Issue: 3

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  • Report No.: LBL-10453-Rev.
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1030587
  • Archival Resource Key: ark:/67531/metadc830226

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  • November 1, 1983

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  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 7:11 p.m.

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Pincosy, P.A.; Myers, B.R.; Levine, M.A.; Feinberg, B.; Niland, R.A. & Soroka, L. EXPERIMENTAL RESULTS ON TRAPPING A GUN PLASMA IN A TOROIDAL MAGNETIC CUSP EXPERIMENT, article, November 1, 1983; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc830226/: accessed November 12, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.