A simple, fast, reliable diamagnetically driven gas puff valve is described. It offers an extremely quick rise time (sim;100 mgr;s) and a large pressure rise rate (sim;270 Pa/mgr;s at a distance of 13.5 cm) with an input energy of only 90 J (600 V on a 500 mgr;F capacitor). Because the valve can be operated with such a small input energy, solidhyphen;state switching devices are adequate and the operation of the valve will not produce the amount of electrical noise that other valves needing higher energy often do. Our valve achieves highhyphen;density puffs at relatively low plenum pressure (380 kPa, 3.8 atm), permitting it to be extremely simple in design and easy to operate. The entire package (valve plus driving circuit) is small in size; it can fit in a volume 4 in. in diameter by 8 in. long. The valve holds about 60 cm3of gas and has an outlet opening of 1/4 in. in diameter.
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