Efficient laser-plasma line X-ray source was developed. X-ray generation was optimized by the laser pulse duration alteration and using the local helium blowing into the microplasma region on a copper target located in atmospheric conditions. Measured Kα x-ray flux of 2·107 ph/pulse/2π sr and conversion efficiency of 10-5 were achieved correspondingly. Keywords: femtosecond laser pulses, X-rays.
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