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- W1505728181 abstract "At the Prague Asterix Laser System Center (PALS) the Asterix laser delivering up to 700 J in 0.5 ns is used as a pump source for x‐ray laser experiments and applications. The prepulse technique was applied which is known to improve the neon‐like x‐ray laser at the J = 0 – 1 transition dramatically. Since Zn slab targets were used the output wavelength was 21.2 nm. A prepulse having up to 20 J precedes the main pulse by 10 ns. The main beam and the prepulse beam are focussed by two different optical systems separately and their foci are superimposed at the target surface. By implementing a half‐cavity for double‐pass amplification using a Mo/Si multilayer mirror ‐ which can be used for 100 shots ‐ the x‐ray laser output was more than 10 times stronger than at the single pass in a 3 cm long plasma. Double‐pass amplification was observed to be most efficient when the pump pulse was at least 150 ps longer than the round trip time (≈ 260 ps) in the half‐cavity. Under this fundamental condition the x‐ray laser reached saturation in the double‐pass regime containing ∼4mJ energy which was proved to be enough for applications. In this contribution, the x‐ray laser features like divergence in two dimensions, the beam quality (symmetry), and the pointing angle are investigated over 110 shots. To characterize the stability of the x‐ray laser the shot distribution, the mean value and the standard deviation for these parameters are evaluated. For 18 shots of a one‐day‐series these values are given, and a statistical analysis carrying out a chi‐squared test characterize the Zn x‐ray laser as a robust tool suitable for future applications." @default.
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- W1505728181 date "2002-01-01" @default.
- W1505728181 modified "2023-09-27" @default.
- W1505728181 title "On the stability of the zinc x-ray laser beam quality using a half cavity" @default.
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- W1505728181 doi "https://doi.org/10.1063/1.1521016" @default.
- W1505728181 hasPublicationYear "2002" @default.
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