Michael, C. A.; Tanaka, K.; Vyacheslavov, L. N.; Sanin, A.; Kharchev, N. K.; Akiyama, T.; Kawahata, K.; Okajima, S.
High k turbulence, up to 30 cm(-1), can be measured using the two dimensional CO₂ laser phase contrast imaging system on LHD. Recent hardware improvements and experimental results are presented. Precise control over the lens positions in the detection system is necessary because of the short depth of focus for high k modes. Remote controllable motors to move optical elements were installed, which, combined with measurements of the response to ultrasound injection, allowed experimental...[Show more]
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