Some characteristics of pulsed nozzle beams

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Abstract
Some characteristic properties of pulsed nozzle beams produced with an automobile fuel injector were observed. A commercial fuel injector was modified to produce a beam pulse of a regular square shape. The beam pulse of 5 ms is again chopped by a slotted disk chopper to make a shorter burst at an arbitrary portion of the original pulse. Rotation of the disk chopper and actuation of the injector are synchronized by a microcomputer. Time-of-flight measurements were performed using beams of 15.6-μs width formed in this way. Beam fluxes were measured with a flow-through detector. The maximum beam fluxes and terminal speed ratios obtained for several gases in this work are comparable to the values published by other workers. Recoils of beam molecules from the skimmer and its vicinity significantly affect the quality of the pulsed beams.