Cotton-Mouton polarimeter with HCN laser on CHS

Journal Article · Sun Oct 15 00:00:00 EDT 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2229275· OSTI ID:20861316

Akiyama, T; Kawahata, K; Ito, Y; Okajima, S; Nakayama, K; Okamura, S; Matsuoka, K; Isobe, M; Nishimura, S; Suzuki, C; Yoshimura, Y; Nagaoka, K; Takahashi, C ^[1]

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1. National Institute for Fusion Science, 322-6 Oroshi-cho, Toki-shi, Gifu 509-5292 (Japan)

Polarimeters based on the Cotton-Mouton effect hold promise for electron density measurements. We have designed and installed a Cotton-Mouton polarimeter on the Compact Helical System. The Cotton-Mouton effect is measured as the phase difference between probe and reference beams. In this system, an interferometric measurement can be performed simultaneously with the same probe chord. The light source is a HCN laser (wavelength of 337 {mu}m). Digital complex demodulation is adopted for small phase analysis. The line averaged density evaluated from the polarimeter along a plasma center chord is almost consistent with that from the interferometer.

• OSTI ID: 20861316
• Journal Information: Review of Scientific Instruments, Vol. 77, Issue 10; Other Information: DOI: 10.1063/1.2229275; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0034-6748
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CONFINEMENT
ELECTRON DENSITY
INTERFEROMETERS
LASERS
LIGHT SOURCES
LIGHT TRANSMISSION
PHASE STUDIES
PLASMA
PLASMA DENSITY
PLASMA DIAGNOSTICS
POLARIMETERS
PROBES
STELLARATORS
VOIGT EFFECT