A fast valve which can inject gas pulses with durations from 25 to 400 IL~ int? a vacuum system is described. Quantities up to 5 Torrl can be injected .. A p~ess~re ns~ tIme of -?5 TorrlILs has been determined at th~ valv~ open~ng. A .fast. openmg tIme 1S ach1eved by havmg a magnetically accelerated ring colhde w1th a d1Sk Wh1Ch 1S used as a vacuum seal. Gas pulse parameters have been measured with a fast ionization gauge.
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