Theoretical research on Ni-like Ag X-ray laser by grazing incidence in 1.2×1013 W·cm-2

Using our series codes, quasi-stable Ni-like Ag collisional excitation scheme driven by laser with grazing incidence was studied. Comparing with that with normal incidence, at low drive intensity of 1.2×1013 W·cm-2, the laser energy is mainly deposited around gain region, and the electronic temperature on the gain region can be dramatically increased, as well as gain coefficients. The delay time and the grazing incidence angle were optimized. If the delay time of 10.5 ns and grazing incidence angle of 16 degree are adopted, the effective gain of grazing incident scheme reaches 23.8 cm-1, which is 84% higher than that of normal incidence. Using driving laser energy of only 13 J, deeply saturated gain with gain length product being 23.8 can be obtained.