High power neutral beam experiments on the ISX-B tokamak

Results are presented of neutral beam injection experiments carried out in the ISX-B tokamak. Root-mean-square (rms) beta values of 3% have been achieved. No evidence of a beta limit has been observed. The ISX-B tokamak facility is described and results from the high beta injection experiments are presented. The theoretical calculations of ballooning mode instability thresholds are compared with experimental measurements, and observations of a phenomenon called density clamping that have been made during high power neutral beam injection are described and discussed