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Review of Scientific Instruments / Volume 61 / Issue 11

Rev. Sci. Instrum. 61, 3552 (1990); http://dx.doi.org/10.1063/1.1141569 (5 pages)

Motional Stark effect polarimetry for a current profile diagnostic in DIII‐D

D. Wróblewski1, K. H. Burrell2, L. L. Lao2, P. Politzer2, and W. P. West2

1Lawrence Livermore National Laboratory, Livermore, California 94550
2General Atomics, San Diego, California 92186‐9084

(Received 8 May 1990; accepted 8 June 1990)

Motional Stark effect produces large net linear polarization of Hα emission from neutral beams in tokamaks. Measurement of the polarization direction permits determination of the local magnetic field pitch angle. Design of a single point, spatially scannable, high‐sensitivity polarimeter installed on DIII‐D is described. Excellent signal‐to‐noise ratio with good temporal and spatial resolution was obtained in preliminary measurements of magnetic field pitch angle.

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KEYWORDS and PACS

Keywords

LINEAR POLARIZATION, H−ALPHA LINES, TOKAMAK DEVICES, PLASMA DIAGNOSTICS, STARK EFFECT, POLARIMETRY, SIGNAL−TO−NOISE RATIO, SPATIAL RESOLUTION, EMISSION SPECTRA, CURRENT DENSITY

PACS

  • 52.55.Fa

    Tokamaks, spherical tokamaks

  • 52.70.Ds

    Electric and magnetic measurements

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.1141569

PUBLICATION DATA

ISSN

0034-6748 (print)  
1089-7623 (online)

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    References

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    L. K. Huang, D. Wróblewski, M. Finkenthal, and H. W. Moos, Phys. Rev. A 40, 5224 (1989).


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