Laser Faraday rotation measurement of current density fluctuations and electromagnetic torque (invited)

W. X. Ding; D. L. Brower; B. H. Deng; D. Craig; S. C. Prager; V. Svidzinski

doi:10.1063/1.1785275

Laser Faraday rotation measurement of current density fluctuations and electromagnetic torque (invited)

W. X. Ding, D. L. Brower, B. H. Deng, D. Craig, S. C. Prager, V. Svidzinski

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

Far-infrared laser polarimetry with time response up to ∼1 μs and spatial resolution ∼8 cm has been successfully implemented on the Madison Symmetric Torus reversed-field pinch. Internal magnetic field and current density fluctuations are nonperturbatively measured. This is accomplished by taking parallel polarimetry chords which measure the line-integrated magnetic field fluctuations via Faraday rotation. With suitable analysis we are able to obtain information on spatial profiles of magnetic field fluctuations and current density fluctuations. Coherent interaction between these fluctuations is also measured and observed to generate an electromagnetic fluctuation-induced torque 〈δJ × δB〉.

Original language	English (US)
Pages (from-to)	3387-3392
Number of pages	6
Journal	Review of Scientific Instruments
Volume	75
Issue number	10 II
DOIs	https://doi.org/10.1063/1.1785275
State	Published - Oct 2004

All Science Journal Classification (ASJC) codes

Instrumentation

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10.1063/1.1785275

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title = "Laser Faraday rotation measurement of current density fluctuations and electromagnetic torque (invited)",

abstract = "Far-infrared laser polarimetry with time response up to ∼1 μs and spatial resolution ∼8 cm has been successfully implemented on the Madison Symmetric Torus reversed-field pinch. Internal magnetic field and current density fluctuations are nonperturbatively measured. This is accomplished by taking parallel polarimetry chords which measure the line-integrated magnetic field fluctuations via Faraday rotation. With suitable analysis we are able to obtain information on spatial profiles of magnetic field fluctuations and current density fluctuations. Coherent interaction between these fluctuations is also measured and observed to generate an electromagnetic fluctuation-induced torque 〈δJ × δB〉.",

author = "Ding, {W. X.} and Brower, {D. L.} and Deng, {B. H.} and D. Craig and Prager, {S. C.} and V. Svidzinski",

year = "2004",

month = oct,

doi = "10.1063/1.1785275",

language = "English (US)",

volume = "75",

pages = "3387--3392",

journal = "Review of Scientific Instruments",

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publisher = "American Institute of Physics",

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T1 - Laser Faraday rotation measurement of current density fluctuations and electromagnetic torque (invited)

AU - Ding, W. X.

AU - Brower, D. L.

AU - Deng, B. H.

AU - Craig, D.

AU - Prager, S. C.

AU - Svidzinski, V.

PY - 2004/10

Y1 - 2004/10

N2 - Far-infrared laser polarimetry with time response up to ∼1 μs and spatial resolution ∼8 cm has been successfully implemented on the Madison Symmetric Torus reversed-field pinch. Internal magnetic field and current density fluctuations are nonperturbatively measured. This is accomplished by taking parallel polarimetry chords which measure the line-integrated magnetic field fluctuations via Faraday rotation. With suitable analysis we are able to obtain information on spatial profiles of magnetic field fluctuations and current density fluctuations. Coherent interaction between these fluctuations is also measured and observed to generate an electromagnetic fluctuation-induced torque 〈δJ × δB〉.

AB - Far-infrared laser polarimetry with time response up to ∼1 μs and spatial resolution ∼8 cm has been successfully implemented on the Madison Symmetric Torus reversed-field pinch. Internal magnetic field and current density fluctuations are nonperturbatively measured. This is accomplished by taking parallel polarimetry chords which measure the line-integrated magnetic field fluctuations via Faraday rotation. With suitable analysis we are able to obtain information on spatial profiles of magnetic field fluctuations and current density fluctuations. Coherent interaction between these fluctuations is also measured and observed to generate an electromagnetic fluctuation-induced torque 〈δJ × δB〉.

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JO - Review of Scientific Instruments

JF - Review of Scientific Instruments

IS - 10 II

ER -

Laser Faraday rotation measurement of current density fluctuations and electromagnetic torque (invited)

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