Abstract
The mathematical model presented as the numerical simulation of a relativistic electron beam in a drift tube with finite external magnetic field consists of the system of Maxwell's equations and the equations of motion of the relativistic electrons in a vacuum. The values of current density and space charge required to complete the system are calculated by the ''current tube'' method. It follows from the calculations performed that in numerical simulation of a steady-state relativistic electron beam at input currents above the limit value in metallic drift tubes at B /sup e/ /sub z/ greater than or equal to 5 kG calculations with monoenergetic input beams can be recommended, while in the opposite case to insure stability of the iteration process it is necessary to use an energetic or angular distribution of the input current.
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