Abstract

Design and experimental results of the vacuum interface in the 3-kJ-class KrF-laser amplifier in our laboratory are reported. With the uniform field distribution throughout the disk-shaped interface, electrical stress on the diaphragm is alleviated with no grading rings and the inductance due to the insulator is reduced. High-voltage pulses (600 kV/270 ns) can be handled with stability. Application of this interface design to still larger amplifiers is also discussed.

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