Experimental survey of HT-7 superconducting tokamak

The operating plan for HT-7 Superconducting tokamak considers the staging of its hardware capabilities after finished its construction. Superconducting magnet of toroidal coils enters upon the superconducting phase after cooling down in 4 days, and then it is charged to 2.4 tesla., but it is reduced to 1.4 tesla or so when operation of ohmic discharge. Two experimental items, in this operation, are performed as following. A) increasing flux swing by bias-magnetism for getting longer pulses ohmic plasma is conducted. A 1s flat-top duration discharge is achieved with a lower safety factor qa (∼2). Plasma current is up to 0.16 MA, loop voltage ∼1V, chord-average density 1.3 x 1019 m-3, Te(0) > 1 keV and Ti = 0.3 keV without any auxiliary heating; B) plasma current modulation for investigations both of plasma current feedback controlling and plasma current profile with LHCD and ICRF which will be preformed in the next experiment. The details physical investigation, in this operation, is less because of some technological troubles. (author)