Continuous-wave x-ray exposure was first used as a preionizer on a pulsed-discharge HF laser. We investigated experimentally the preionization effect of this cw x-ray preionizer on a pulsed HF laser. Although the cw x-ray preionizer resulted in a characteristic performance similar to that of the flash x-ray preionizer, the cw x-ray generator has a much larger dose than a flash x-ray generator. Applicability of a cw x-ray preionizer to a high-repetition-rate pulsed laser was discussed.
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