Abstract
MHD activity and turbulence near the plasma edge are studied on the JIPP T-IIU tokamak using a new high-speed visible-light image-converter video-camera system. Different from conventional cinefilm and photo-diode array systems, this system is convenient for the instantaneous display of the high-speed optical plasma images after plasma discharges.The effectiveness of this instrument for research on the plasma-wall interaction is demonstrated in this experiment. The observed characteristics of the edge-plasma behavior are as follows: (1) The helical mode structure of the luminous plasma boundary suggesting plasma-surface interaction is identified in the case of OH or ICRF-heated discharge. (2) In the LH-current drive case, no clear large-scale coherent modes are identified, however, on the initial stage a medium-scale turbulence (λ ~ a few cm, f ~10 kHz) is found. (3) Before current disruptions, an m = 2 or m = 3 helical mode is found and up-down asymmetric light emissions are often observed during disruptions.
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