1. Phase contrast imaging interferometer for edge density fluctuation measurements on LHD
- Author
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Leonid Vyacheslavov, Kazuo Kawahata, T. Tokuzawa, S. Okajma, Y. Ito, Shunji Tsuji-Iio, Andrei Sanin, Tsuyoshi Akiyama, and K. A. Tanaka
- Subjects
Physics ,Wavelength ,Large Helical Device ,Interferometry ,Optics ,business.industry ,Phase-contrast imaging ,Astronomical interferometer ,Wavenumber ,Plasma diagnostics ,Plasma ,business ,Instrumentation - Abstract
A phase contrast interferometer employing a CO_2 laser (wavelength lambda_i = 10.6 ?m) is designed and installed in order to study density fluctuations on a large helical device. A 250×50 mm slab beam passes the edge of the plasma, where rho= r/a>0.65, and provides observations of edge density fluctuations. A spatial image of the integrated fluctuations is measured by a multichannel detector array, of which the effective spacing is 5 mm in the plasma. Measured wave number components are dominated by radial components, and within the range of 7.2×10^?2
- Published
- 2003
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