Abstract: Disclosed is an electron beam current stabilizing device comprising a sensing element (12) responsive to the beam current deviation from the predetermined value, a saw-tooth voltage shaper (14) connected to a high-voltage transformer (2) of an acceleration voltage source and providing periodic saw-tooth voltage, smoothly sloping portions thereof being shaped starting from the moment when the voltage at the high-voltage transformer (2) crosses zero, an adder (13) whose one input is connected to the output of the sensing element (12), and the other input, to the output of the shaper (14), a threshold element (15) connected to the output of the adder (13), a differentiator (16) connected to the output of the threshold element (15) to shape the electric driving pulses when the smoothly sloping portions of the saw-tooth voltage cross at the output of the adder (13) the threshold level of the threshold element (15), a light source connected to the output of the differentiator (16) to convert the electric driving pu

Abstract: A device for scanning a beam of charged particles comprises longitudinal and cross-sectional scanning electromagnets (1,4) to deflect the beam, respectively, lengthwise and crosswise over the exit window (2), longitudinal and cross-sectional scanning current generators (5, 6) to energize the respective electromagnets (1, 4), and a variable delayer (7) connected between the longitudinal scanning current generator (5) and the synchronizing input of the cross-sectional scanning current generator (6) so that pulses arrive at the input of the variable delayer (7) at the moments when current in the windings of the electromagnet (1) reaches its peak. The variable delayer (7) provides N delay times different from each other by a value of .DELTA. t and set in succession as the pulses arrive at its input, the values N and .DELTA. t being determined from the following relationships:.DELTA.t.ltoreq.d/2f.sub.1 L; N.gtoreq.1/f.sub.2 .DELTA.twhered--diameter of the charged particle beam,f.sub.