Abstract
We report on our investigations of the distribution of diameter of a focused electron beam along the propagation direction at the forevacuum pressures as a function of beam parameters and working gas pressure. The influence of electron beam parameters on the fraction of current transported through a narrow, extended tube is considered. We find that the angles of convergence and divergence of the focused beam depend on the position of the beam crossover point, and that maximum beam transmission through the tube is ensured at lower gas pressure and higher beam accelerating voltage. Up to 90% beam transmission efficiency is obtained for beam transport through a metal tube with diameter 8 mm and length 30 cm.
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