Abstract
A low impedance electron beam system has been developed to pump a 70 ns, 200 J-class Kr F laser in a face to face configuration. The laser was designed as a power amplifier of a tera-watt picosecond excimer laser system. Two modules of 2 ohm impedance electron beam gun were driven by double parallel plate Blumlein circuits with 500 k V rail-gaps as main switches to pump gain medium uniformly from both sides with the guide magnetic field of 1 k Gauss. The energy deposited in the 42 litter laser gain region was measured by several diagnostics to determine the energy transfer efficiency and the spatial uniformity of energy deposition. The 500 k V rail-gap was triggered by a compact Kr F laser with reduced switching time and jitter of 20 ns and 1.9 ns, respectively. The laser triggering of the rail-gap enabled the exact synchronization of amplifier chain as well as improved operation of this system.
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