CENTRIFUGAL PELLET INJECTOR WITH DIRECT SOLID-DEUTERIUM FEED

Pellet injectors are used for ablation and refuelling experiments in plasma machines. A centrifugal injector with direct feed at rotation frequencies of up to 500 Hz for quasi-continuous refuelling of the ASDEX tokamak by pellet injection is described. The centrifuge slices 1. 2 mm long pellets from a cylindrical, solid D//2 filament 1 mm in diameter and then accelerates them. The synchronised and intermittent filament ejection allows a rate of up to 50 pellets per second. After travelling an angle of 98 degree pellets leave the rotor with an exit scattering angle of plus or minus 1. 4 degree and a speed of up to 720 m s** minus **1, which is twice the circumferential speed.