Pulse Power Considerations For The Generation of 45 µs, 200 keV Electron Beams For CO[sub]2[/sub] Lasers

R. D. Curry; P. Champney; L. Demeter; S. Lyons; D. Morton; H. Nishimoto; R. Sears; L. Schlitt; W. Weseloh

doi:10.1117/12.951344

10 April 1989 Pulse Power Considerations For The Generation of 45 µs, 200 keV Electron Beams For CO₂ Lasers

R. D. Curry, P. Champney, L. Demeter, S. Lyons, D. Morton, H. Nishimoto, R. Sears, L. Schlitt, W. Weseloh

Proceedings Volume 1046, Pulse Power for Lasers II; (1989) https://doi.org/10.1117/12.951344
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

A two module electron beam source operating over a wide range of output parameters has been designed and fabricated to be used in conjunction with a pair of electron beam sustained CO2 lasers. Each module comprised a grid-controlled thermionic electron beam gun including a compact grid pulser for control of the electron beam, a 250 kV thyratron switched modulator for acceleration of the electron beam, a 1 kHz filament heater and a complex computerized control system. The system was designed to reliably produce 45 μs is wide electron pulses of 150-200 keV energy, operate at repetition rates of 1-10 pps and current densities of 5-20 mA/cm2. Additional parameters are listed in Table 1. The high voltage cathode assembly employs 132 thoriated tungsten filaments distributed over the area of the 250 cm x 10 cm output window. The cathode assembly including the control grids is supported by two high voltage ceramic bushings in a stainless steel vacuum chamber. For acceleration of the electron beam, a pulsed 150-250 kV voltage is applied by a thyratron switched modulator, between the cathode and anode window. The fiber optically controlled grid pulser located in the modulator tank is floated at the applied cathode potential.

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R. D. Curry, P. Champney, L. Demeter, S. Lyons, D. Morton, H. Nishimoto, R. Sears, L. Schlitt, and W. Weseloh "Pulse Power Considerations For The Generation of 45 µs, 200 keV Electron Beams For CO₂ Lasers", Proc. SPIE 1046, Pulse Power for Lasers II, (10 April 1989); https://doi.org/10.1117/12.951344

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