Abstract
Plasmas were produced by an electron beam (600 kV, 10 kA peak, 3 ns FWHM) in a drift tube filled with neutral gas (He, H2, Ne, N2, Ar, Kr, or Xe) over a wide range (0.1–100 Torr) of pressure without an external field. The beam current at the end of the drift tube and the current of the high-energy beam and plasma electrons expelled to the drift-tube wall were measured with Faraday cups, the total (beam plus plasma) current with magnetic loop coils; and the light emission from the plasma with an open-shutter camera and a spectrograph. It was found that the plasma consists of bright center (high-conductivity) and dark outer (low-conductivity) regions and that the plasma current after passage of the beam, which persists for a characteristic time of (2 µs max.) depending on the gas pressure, retains a configuration similar to that of the total current established during passage of the beam.
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