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Application of precise phase detector for density profile and fluctuation measurements using CO2 imaging heterodyne interferometer on LHD

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8 Author(s)
Vyacheslavov, L.N. ; Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia ; Khilchenko, A.D. ; Zubarev, P.V. ; Tanaka, K.
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The two-color CO2/YAG laser imaging heterodyne interferometer was recently equipped with a precise digital phase counter (eight channels, 0.5 mrad resolution, 1 MHz carrier frequency and sampling rate, 500 kHz bandwidth, ±250 rad recording range, and a maximum data record of 8.4×106 samples/channel). This modification enables detailed measurements of plasma density dynamics during pellet ablation and, in addition, observations of density fluctuations. Examples of fast rising density peaks in pellet discharges as well as spatial and spectral characteristics of plasma density fluctuations obtained with the heterodyne interferometer are presented.

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Review of Scientific Instruments  (Volume:77 ,  Issue: 10 )