Soft X-Ray Computer Tomography of Tokamak Plasma in Control Experiment of Locked-Mode Disruption by Electron Cyclotron Heating

A locked-mode disruption is artificially induced by lower hybrid current drive on a tokamak. By applying electron cyclotron heating (ECH), the disruption can be avoided. The time evolution of plasma internal structure during ECH is investigated with soft X-ray computer tomography. We have found that the mode locking and the growth of
$m = 1$
and
$m = 2$
modes are suppressed during ECH.