Abstract
A gas injection system that provides three independent gas sources has been developed for the Advanced Toroidal Facility (ATF). Each of the three gas injection lines can supply hydrogen gas at flow rates of 1 to 100 Torr l/s (nitrogen at flow rates of 1.5 to 15 Torr l/s). A feedback control system allows gas injection pulse shaping, with a flow rate rise-time response of <3 ms and a fall-time response of <15 ms. In addition, an autozeroing system removes long-term (>500 ms) temperature drifts in the feedback sensor and reduces effects caused by changes in the magnetic field. A pressure-measuring system provides an absolute measurement of the amount of gas injected into the ATF vacuum vessel as a function of time. The components used in the gas injection lines are discussed, and compromises are elucidated. Flow limits, time constants, and other pertinent points are presented.
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