This study is devoted to investigation of femtosecond laser radiation parameters (intensity, contrast, polarization)
influence on properties of hot electron population of dense plasma created at the surface of melted metal target.
It was shown that metals such as gallium, indium and bismuth heated above melting temperature can be used as a
target for 10 Hz femtosecond laser plasma highly stable hard x-ray source.
Experimentally it was shown that liquid gallium can be used as a target for 10 Hz femtosecond laser plasma x-ray
source. X-ray measurements demonstrated that temperature of hot electrons in gallium plasma does not differ from plasma of
solid target and equal to 6.2±1.OkeV.
It was shown that liquid gallium heated up to 270°C can be used as a target for 10 Hz femtosecond laser plasma highly stable x-ray source. The decreasing of hard x-ray yield during 50000 laser shots is less then 25% and can be easy compensated by additional focusing of objective or temperature tuning.
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