High beta results in ISX-B with intense neutral beam injection

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Experiments on the ISX-B device show a deterioration in confinement at high beam power. In particular the electron energy confinement time falls catastrophically with increasing beam power. The maximum volume averaged beta values achieved are <2.5%; this is much less than would be predicted by extrapolating the low power data. Elongation has not been observed to have any significant effect on the maximum attainable beta, perhaps due to the limited range of both internal and external elongation. The electron energy confinement time does not follow Alcator scaling at high injection powers. There are two likely candidates for the loss of ... continued below

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Pages: 12

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Edmonds, P.H.; Bates, S.C. & Bell, J.D. January 1, 1982.

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Experiments on the ISX-B device show a deterioration in confinement at high beam power. In particular the electron energy confinement time falls catastrophically with increasing beam power. The maximum volume averaged beta values achieved are <2.5%; this is much less than would be predicted by extrapolating the low power data. Elongation has not been observed to have any significant effect on the maximum attainable beta, perhaps due to the limited range of both internal and external elongation. The electron energy confinement time does not follow Alcator scaling at high injection powers. There are two likely candidates for the loss of confinement. The phenomena may be ..beta../sub p/ specific and caused by the gradual onset of resistive MHD pressure driven modes producing deteriorating confinement through fluctuations in the poloidal magnetic field. Alternatively the phenomena may be specific to the method of heating, neutral injection, being caused, for example, by plasma rotation, where the rotation speed approaches the ion thermal velocity. Experiments are in progress to investigate both of these possibilities.

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Pages: 12

Notes

NTIS, PC A02/MF A01.

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  • Symposium on heating in toroidal plasmas, Grenoble, France, 22 Mar 1982

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  • Other: DE82011966
  • Report No.: CONF-820345-5
  • Grant Number: W-7405-ENG-26
  • Office of Scientific & Technical Information Report Number: 5455666
  • Archival Resource Key: ark:/67531/metadc1070980

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Office of Scientific & Technical Information Technical Reports

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  • January 1, 1982

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • April 2, 2018, 1:12 p.m.

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Edmonds, P.H.; Bates, S.C. & Bell, J.D. High beta results in ISX-B with intense neutral beam injection, article, January 1, 1982; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1070980/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.