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Abstract. The low voltage startup plasma has been studied in the HT-7
(
R = 1.22m,
a = 0.27m) tokamak with Ion Cyclotron Range of Frequency
(ICRF) wave and Lower Hybrid Wave (LHW) for pre-ionization. Successful low
loop voltage startup experiment results had been obtained with ICRF (about
150kW) and LHW (about 200kW), for example,
E 
0.5V/m (with),
E 2.5V/m (without). The ICRF and LHW assisted startup
experiments on HT-7 have been successful in showing the positive effect on
plasma pre-ionization and target plasma formation; reduction of the
volt-second consumption during the period of the breakdown and the ramp-up;
reduction of the loop voltage in the breakdown; and setting of a beneficial
ramp-up rate for the whole superconducting tokamak.
IAEA 2001
