Intense and reproducible Kr Kα X-rays (∼12.7 keV) have been generated via the interaction between a 3 TW laser pulse and a micron-sized Kr cluster target. A single-photon counting technique with an X-ray charge-coupled device (X-ray CCD) was used for measurements of the X-ray energy spectrum in a single shot. At a laser irradiance of 8 ×10 16 W/cm 2 , the averages and standard deviations of the total X-ray yield and Kα X-ray yield were equal to (6.6 ±1.1) ×10 7 and (6.8 ±2.6) ×10 5 photons/sr, respectively. When the X-ray energy spectrum was fit using a Maxwellian with an effective temperature, the temperature was estimated to be 1.62 ±0.08 keV. These results indicate that the X-ray energy spectrum was reproducible at 8 ×10 16 W/cm 2 .
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Hayashi et al. (2010) studied this question.
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