Control of internal profiles via LHCD on Alcator C-Mod

  • J. R. Wilson
  • , R. R. Parker
  • , P. T. Bonoli
  • , A. E. Hubbard
  • , J. W. Hughes
  • , A. Ince-Cushman
  • , C. Kessel
  • , J. S. Ko
  • , O. Meneghini
  • , M. Porkolab
  • , M. Reinke
  • , J. E. Rice
  • , A. E. Schmidt
  • , S. Shiraiwa
  • , S. Scott
  • , G. M. Wallace
  • , J. C. Wright

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

LHCD on Alcator C-Mod is being used in plasmas with parameters similar to those expected on ITER for the purpose of tailoring the plasma current profile. LHCD experiments have also produced intriguing results related to momentum transport and edge pedestal physics that affect the toroidal rotation profile and the temperature and density profiles. Quantitative comparisons between local measurements and theory/simulation have been performed, confirming the off-axis localization of the current drive, as well as its magnitude and location dependence on the launched n spectrum and electron temperature. Applying LHCD during the current ramp saves volt-seconds and delays the peaking of the current profile. Counter current toroidal rotation during LHCD has been observed in both L and H-mode plasmas. In H-mode plasmas the edge pedestal collisionality is reduced while the overall pressure in the pedestal increases slightly.

Original languageEnglish (US)
Title of host publicationRadio Frequency Power in plasmas - Proceedings of the 18th Topical Conference
Pages327-330
Number of pages4
DOIs
StatePublished - 2009
Externally publishedYes
Event18th Topical Conference on Radio Frequency Power in plasmas - Gent, Belgium
Duration: Jun 24 2009Jun 26 2009

Publication series

NameAIP Conference Proceedings
Volume1187
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference18th Topical Conference on Radio Frequency Power in plasmas
Country/TerritoryBelgium
CityGent
Period6/24/096/26/09

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

Keywords

  • Lower hybrid current drive
  • Rotation in toroidal plasmas

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