Measurement of internal magnetic field fluctuations in a reversed-field pinch by Faraday rotation.
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.
Ding
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Electrical Engineering Department, University of California-Los Angeles, Los Angeles, California 90095, USA.
Brower
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DL
Terry
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Craig
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Prager
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Sarff
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Wright
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JC