A Triode Electron Gun of Linear Accelerator LUE-200, IREN Facility, FLNP, JINR

The electron injector (electron gun) is a triode system (cathode-control grid-anode with a second grid 'wall') with a grounded anode and an isolated filament shielded cathode, which is supplied with high-voltage (up to −200 kV) pulse from the thyratron modulator through a pulse transformer. A triode gun is an electron injector with the heated oxide-barium cathode and a controlled startup on the grid cathode-grid node from the microwave lamp GS-34. Starting the grid with adjustable delay to adjust the pulse duration from 40 to 400 ns injected from the cathode beam is made from the starting pulse of the cathode node from the first channel of the synchronizer. From the second channel, the thyratron modulator is launched. As a result of adjustment, a beam 5 mm in diameter with a current pulse of 5 A at a current of focusing solenoid ML1 of 3.1 A, voltage of 200-220 kV and frequency of 25 Hz was obtained.