Eight-shot pneumatic pellet injector for the Advanced Toroidal Facility

An eight-shot pneumatic pellet injector has been developed for routine plasma fueling and optimization studies on short-pulse fusion experiments. Such experiments will require injection sequences of several pellets of various size over the discharge period. Two eight-shot injectors that are capable of producing and firing hydrogen and deuterium pellets have been built. The injectors are based on the pipe-gun concept, which generates deuterium and hydrogen pellets by direct condensation in the barrel. One injector is in operation on the Princeton Beta Experiment, and the other is operational on the Advanced Toroidal Facility (ATF). A general overview of the gun, the ATF injection line, and the ATF diagnostic systems is given