Measurement of internal magnetic field fluctuations in a reversed-field pinch by Faraday rotation |
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Authors: | Ding W X Brower D L Terry S D Craig D Prager S C Sarff J S Wright J C |
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Institution: | Electrical Engineering Department, University of California-Los Angeles, Los Angeles, California 90095, USA. |
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Abstract: | Magnetic field fluctuations (and the associated current perturbation) have been measured in the core of a high-temperature reversed-field pinch using a newly developed fast-polarimetry system. Radial magnetic field fluctuation levels of approximately 1% are measured in standard-reversed-field pinch discharges which increase to approximately 4% during the sawtooth crash (enhanced dynamo). The fluctuation level is reduced fourfold for high-confinement plasmas where the core-resonant tearing modes are suppressed. |
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