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Title: Sawtooth modulation of fast wave transmission on alcator C-mod

Abstract

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.

Authors:
; ; ;  [1]
  1. MIT Plasma Science and Fusion Center, Cambridge, Massachusettes 02139 (United States)
Publication Date:
OSTI Identifier:
21210442
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 485; Journal 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); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ABSORPTION; ALCATOR DEVICE; ANTENNAS; COMPUTERIZED SIMULATION; F CODES; HIGH-FREQUENCY HEATING; IONS; MODULATION; PLASMA; PLASMA DIAGNOSTICS; PLASMA INSTABILITY; PLASMA SIMULATION; RF SYSTEMS; SAWTOOTH OSCILLATIONS

Citation Formats

Reardon, J., Bonoli, P. T., Porkolab, M., and Wukitch, S. J. Sawtooth modulation of fast wave transmission on alcator C-mod. United States: N. p., 1999. Web. doi:10.1063/1.59725.
Reardon, J., Bonoli, P. T., Porkolab, M., & Wukitch, S. J. Sawtooth modulation of fast wave transmission on alcator C-mod. United States. doi:10.1063/1.59725.
Reardon, J., Bonoli, P. T., Porkolab, M., and Wukitch, S. J. Mon . "Sawtooth modulation of fast wave transmission on alcator C-mod". United States. doi:10.1063/1.59725.
@article{osti_21210442,
title = {Sawtooth modulation of fast wave transmission on alcator C-mod},
author = {Reardon, J. and Bonoli, P. T. and Porkolab, M. and Wukitch, S. J.},
abstractNote = {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.},
doi = {10.1063/1.59725},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 485,
place = {United States},
year = {1999},
month = {9}
}