2009
DOI: 10.1063/1.3238509
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A magneto-optic probe for magnetic fluctuation measurements

Abstract: Results from a proof-of-principle experiment are presented that demonstrate it is possible to construct a completely optical, robust, and compact probe capable of spatially resolved measurements of magnetic field fluctuations smaller than 1 G over a frequency range of 1 Hz-8 MHz in a plasma. In contrast to conventional coil probes, the signal strength is independent of fluctuation frequency and the measurement technique is immune to electrostatic pickup. The probe consists of a high Verdet constant crystal, tw… Show more

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“…In presence of smaller magnetic fields, Faraday rotation measurements are still possible, but they require the use of a small birefringent crystal placed within the plasma to increase the rotation. Magneto-optical probes, relying on this enhancement of the Faraday rotation, have been tested with large current-driven magnetic fields [19][20][21]. However, to our knowledge, they have not yet been used to measure smaller fluctuating magnetic fields within a plasma, nor tested against other diagnostics methods.…”
Section: Jinst 12 P12001mentioning
confidence: 99%
“…In presence of smaller magnetic fields, Faraday rotation measurements are still possible, but they require the use of a small birefringent crystal placed within the plasma to increase the rotation. Magneto-optical probes, relying on this enhancement of the Faraday rotation, have been tested with large current-driven magnetic fields [19][20][21]. However, to our knowledge, they have not yet been used to measure smaller fluctuating magnetic fields within a plasma, nor tested against other diagnostics methods.…”
Section: Jinst 12 P12001mentioning
confidence: 99%