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ICRF heating and profile control techniques in TFTR

Journal Article · · Nuclear Fusion
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  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Mission Research Corperation, Newington, Virginia (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. A.F. loffe Physical-Technical lnstitute, St. Petersburg (Russian Federation)
+ Show Author Affiliations
In fast wave to ion Bernstein wave mode conversion experiments in DT supershot plasmas, localized efficient ion heating rather than electron heating was observed, which was due to Doppler broadened tritium cyclotron resonance overlap into the mode conversion region. The ion temperature heat pulse associated with RF power modulation in this regime could provide a diagnostic tool for measuring the local ion thermal conductivity in various confinement regimes. In direct launch ion Bernstein wave heating experiments, core power coupling was limited by the excitation of parasitic edge modes. However, a sheared poloidal flow was observed that is consistent in both magnitude and direction with theoretical models based on RF driven Reynolds stress. With the modest power coupled to the core (~360 kW), the magnitude of the shear in the observed flow was estimated to be a factor of 3-4 too low to trigger transport barrier formation through localized shear suppression of turbulence.
Research Organization:
Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC02-76CH03073
OSTI ID:
1183566
Journal Information:
Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 3Y Vol. 40; ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English

References (6)

Theory of shear suppression of edge turbulence by externally driven radio-frequency waves journal September 1991
Influence of sheared poloidal rotation on edge turbulence journal January 1990
Direct Observation of Ion-Bernstein-Wave-Induced Poloidal Flow in TFTR journal January 1999
Ion cyclotron range of frequencies heating and flow generation in deuterium–tritium plasmas journal May 1998
Tokamak fusion test reactor poloidal rotation diagnostic (invited) journal January 1999
Active core profile and transport modification by application of ion Bernstein wave power in the Princeton Beta Experiment-Modification journal March 1995

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