Overview of steady state tokamak plasma experiments on TRIAM-1M

An overview of steady state tokamak (SST) studies including current ramp-up scenario without using center solenoid coils on TRIAM-1M (R0=0.8 m, axb=0.12mx0.18m and B=8 T) is presented. The following experiments have been carried out to advance the SST concept. 1) Establishment of the current ramp-up scenario, 2) physics understanding for the enhanced current drive (ECD) mode, 3) particle control and heat deposition measurements during the steady state discharge, and 4) investigation of the effects of hydrogen/helium bombardment on the material surface. By installing an ECRH system with a gyrotron of 200 kW and pulse width of 5 s at 170 GHz variety of experiments could be extended in combination with 2.45 GHz (<50 kW), 8.2 GHz (<400 kW) LHCD and ECRH systems. (author)