The interaction of high-power femtosecond laser pulses with matter has now become an important field of study, as the advent of high-power short-pulse laser systems offers the chance of studying a completely new and very complex regime of laser plasma generation. In this paper the results on conversion efficiency into X-ray are presented for a broad range of experimental parameters. The situation is studied, when the contrast of laser pulse is sufficiently high, i.e. the prepulse is eliminated. The results are then compared with the experimental data. We pay the main attenuation on the regime of normal skin-effect in contrary of our previous report.
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