Thermal barrier confinement experiments in TMX-U tandem mirror. Revision 1

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In our recent experiments on the TMX-U thermal-barrier device, we achieved the end plugging of axial ion losses up to a central cell density of n/sub c/ = 6 x 10/sup 12/ cm/sup -3/. During lower density experiments, we measured the axial potential profile characteristic of a thermal barrier and found an ion-confining potential greater than 1.5 kV and a potential depression of 0.45 kV in the barrier region. The average beta of hot end plug electrons has reached 15% and of hot central cell ions has reached 6%. In addition, we heated deuterium ions in the central cell with ... continued below

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Pages: 14

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Simonen, T.C.; Allen, S.L.; Baldwin, D.E.; Casper, T.A.; Clauser, J.F.; Coensgen, F.H. et al. July 26, 1984.

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In our recent experiments on the TMX-U thermal-barrier device, we achieved the end plugging of axial ion losses up to a central cell density of n/sub c/ = 6 x 10/sup 12/ cm/sup -3/. During lower density experiments, we measured the axial potential profile characteristic of a thermal barrier and found an ion-confining potential greater than 1.5 kV and a potential depression of 0.45 kV in the barrier region. The average beta of hot end plug electrons has reached 15% and of hot central cell ions has reached 6%. In addition, we heated deuterium ions in the central cell with ICRF to an average perpendicular energy of 2 keV. During strong end plugging at low density (7 x 10/sup 11/ cm/sup -3/), the axial ion confinement time tau/sub parallel to/ reached 50 to 100 ms while the nonambiopolar radial ion confinement time tau/sub perpendicular to/ was 14 ms - independent of end plugging. Electrically floating end walls doubled the radial ion confinement time. At higher densities and lower potentials, tau/sub parallel to/ was 6 to 12 ms and tau/sub perpendicular to/ exceeded 100 ms.

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Pages: 14

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NTIS, PC A02/MF A01.

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  • 10. international conference on plasma physics and controlled nuclear fusion research, London, UK, 12 Sep 1984

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  • Other: DE84017029
  • Report No.: UCRL-90396-Rev.1
  • Report No.: CONF-840910-8-Rev.1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6441174
  • Archival Resource Key: ark:/67531/metadc1207902

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  • July 26, 1984

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  • July 5, 2018, 11:11 p.m.

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  • Oct. 24, 2018, 11:46 a.m.

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Simonen, T.C.; Allen, S.L.; Baldwin, D.E.; Casper, T.A.; Clauser, J.F.; Coensgen, F.H. et al. Thermal barrier confinement experiments in TMX-U tandem mirror. Revision 1, article, July 26, 1984; United States. (digital.library.unt.edu/ark:/67531/metadc1207902/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.