Stability of TAE modes in DIII-D

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TAE modes driven by neutral beam injection have been observed in DIII-D. The measured frequency agrees very well with theoretical predictions for DIII-D discharges. At large amplitude these instabilities can lead to loss of over 50% of the beam power, as well as large loss of non-resonant MeV fusion products. The threshold value of fast ion beta for destabilization and the observed range of unstable mode numbers are in reasonable agreement with predictions for the mode growth rate. Continuum damping dominates at low mode numbers, while damping by electron kinetic effects dominates at high mode numbers. Preliminary experiments suggest that ... continued below

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8 p.

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Strait, E. J.; Chu, M. S.; Lao, L. L.; Turnbull, A. D.; Heidbrink, W. W. & Duong, H. H. September 1, 1992.

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  • General Atomic Company
    Publisher Info: General Atomics, San Diego, CA (United States)
    Place of Publication: San Diego, California

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Description

TAE modes driven by neutral beam injection have been observed in DIII-D. The measured frequency agrees very well with theoretical predictions for DIII-D discharges. At large amplitude these instabilities can lead to loss of over 50% of the beam power, as well as large loss of non-resonant MeV fusion products. The threshold value of fast ion beta for destabilization and the observed range of unstable mode numbers are in reasonable agreement with predictions for the mode growth rate. Continuum damping dominates at low mode numbers, while damping by electron kinetic effects dominates at high mode numbers. Preliminary experiments suggest that TAB modes can be stabilized by current profile control.

Physical Description

8 p.

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OSTI; NTIS; INIS; GPO Dep.

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  • 14. international conference on plasma physics and controlled nuclear fusion research,Wurzburg (Germany),30 Sep - 7 Oct 1992

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  • Other: DE93002677
  • Report No.: GA-A--21045
  • Report No.: CONF-920913--23
  • Grant Number: AC03-89ER51114
  • Grant Number: FG03-89ER51121
  • Office of Scientific & Technical Information Report Number: 10103283
  • Archival Resource Key: ark:/67531/metadc1277125

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  • September 1, 1992

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  • Oct. 12, 2018, 6:44 a.m.

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  • Nov. 8, 2018, 4:12 p.m.

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Strait, E. J.; Chu, M. S.; Lao, L. L.; Turnbull, A. D.; Heidbrink, W. W. & Duong, H. H. Stability of TAE modes in DIII-D, article, September 1, 1992; San Diego, California. (https://digital.library.unt.edu/ark:/67531/metadc1277125/: accessed March 19, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.