i have absolutely no authority to speculate, but i would guess you'd vent plasma to a heat exchanger by diverting only part of the stream with a controlled EM f

i have absolutely no authority to speculate, but i would guess you'd vent plasma to a heat exchanger by diverting only part of the stream with a controlled EM field, either periodically or continuously. You'd have to do it anyway to remove the helium and inject some fresh tritium and deuterium, right?