The transit time of high current beams of relativistic electrons (40-50 kA, 350 keV) through an air filled (0.2-2.5 Torr) drift tube has been measured. It is longer than expected, even allowing for the loss of beam front electrons and for orbiting of the electrons in the beam self-magnetic field. Also, a pressure-dependent nonuniformity in the beam motion was observed which may account for this delay.
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