Sawtooth modulation of fast wave transmission on alcator C-mod
- MIT Plasma Science and Fusion Center, Cambridge, Massachusettes 02139 (United States)
A new array of loop probes has been installed behind the inner wall tiles, opposite one of the RF antennas. These probes measure the power transmitted through the plasma core. During fundamental minority fast-wave heating in D(H), the transmission factor decreases with increasing minority concentration (scanned shot-to-shot), in agreement with the predictions of a simple analytic theory and of the FELICE full wave code. During a shot the transmission is observed to vary synchronously with the sawtooth instability in the plasma center. The sense of this variation is observed to reverse as the minority concentration is raised. Both observations are consistent with the ejection of minority ions from the core during a sawtooth crash.
- OSTI ID:
- 21210442
- Journal Information:
- AIP Conference Proceedings, Vol. 485, Issue 1; Conference: 13. topical conference on radio frequency power in plasmas, Annapolis, MD (United States), 12-14 Apr 1999; Other Information: DOI: 10.1063/1.59725; (c) 1999 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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