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Bright Ar K-shell x-ray with very little background has been generated usingan Ar clustering gas jet target irradiated with an 800 mJ, 30 fs ultra-highcontrast laser, with the measured flux of 1.1 x 10^4 photons/mrad^2/pulse. Thisintense x-ray source critically depends on the laser contrast and the laserenergy and the optimization of this source with interaction is addressed.Electron driven by laser electric field directly via nonlinear resonant isproved in simulation, resulting in effective electron heating and theenhancement of x-ray emission. The x-ray pulse duration is demonstrated to beonly 10 fs, as well as a source size of 20 um, posing great potentialapplication for single-shot ultrafast x-ray imaging.

Intense high contrast femtosecond K-shell x-ray source from laser-driven Ar clusters