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An attempt is made to explain the behavior of the magneto-hydrodynamic (MHD) instabilities observed at values of the edge safety factor 3<q(a)<4, on the HT-7 superconducting tokamak. For the poloidal-magnetic-field fluctuations observed at the Mirnov coils, Mirnov-coil analysis shows that the MHD activity consists predominantly of m=2 mode. Estimates are given for the characteristic growth time...
A moveable graphite limiter has been developed in order to investigate the influence of the horizontal plasma position on the density limit in the HT-7 tokamak. The local recycling and density limit behaviour has been studied in this Letter, which shows that if plasma is shifted outwards the recycling is low, for inwards shift is high. For these set of ohmic discharges a maximum Greenwald number,...
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