We present results of experimental studies of plasma generation in a long, narrow metal tube by electron beam injection into the tube and simultaneous application of a negative potential to the tube. We show that the threshold electron beam current for plasma initiation increases with decreasing pressure, decreasing tube diameter, and increasingly negative tube potential.
We have investigated the formation features and measured the electrical and optical parameters of aluminum oxide films fabricated by electron-beam evaporation in oxygen in the range of elevated fore-vacuum pressures. On the basis of the proposed physical model and numerical estimates, a consistent
explanation of experimental dependences is given.
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