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Two color multichannel heterodyne interferometer set up for high spatial resolution electron density profile measurements in TJ-II

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URI: https://hdl.handle.net/10016/16367
ISSN: 0034-6748 (Print)
ISSN: 1089-7623 (Online)
DOI: 10.1063/1.3475729
UXXI: AR/0000011442
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two_RSI_2012.pdf (651.51 KB)
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2010-10-05
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American Institute of Physics
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Abstract
Expanded-beam multichannel heterodyne interferometer has been installed on the TJ-II stellarator. Careful design of the optical system has allowed complete control on the evolution of both Gaussian beams along the interferometer, as well as the evaluation and optimization of the spatial resolution to be expected in the measurements. Five CO2 (measurement) channels and three Nd:YAG (vibration compensation) channels have been used to illuminate the plasma with a probe beam of 100 mm size. An optimum interpolation method has been applied to recover both interferometric phasefronts prior to mechanical vibration subtraction. The first results of the installed diagnostic are presented in this paper.
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Proceedings of: 18th Topical Conference on High-Temperature Plasma Diagnostics, Wildwood, New Jersey (USA), 16-20 May 2010.
Keywords
Asma density, Plasma diagnostics, Stellarator TJ-II
Bibliographic citation
Review of Scientific Instruments, (2010), 81(10), 10D517.
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