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Proceedings Paper

Simulations of ASE and seeded transient x-ray lasers using the COLAX code
Author(s): Annie Klisnick; Olivier Larroche; François de Dortan; Jamil Habib; Olivier Guilbaud
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Paper Abstract

We present recent calculations performed with the Maxwell-Bloch COLAX code. We investigate several features of transient X-ray lasers pumped with grazing incidence geometry and operated either with or without seeding by a highorder harmonics pulse. We show that the spontaneous emission source term included in the code accounts well for the speckle patterns observed in near-field and far-field images of the amplification of spontaneous emission (ASE) beams. Our calculations confirm the predictions of a simpler model based on the properties of spatial and temporal coherence of the source. We study the role of varying the level of the harmonic pulse seeded in the X-ray laser plasma. We show that the amplification factor and the contrast with respect to the ASE background cannot be maximized simultaneously. Finally we describe a recent upgrade of the code in which a time-dependent description of the populations of the lasing states has been implemented. This more rigorous treatment allows us to investigate the small-scale temporal behaviour of seeded X-ray lasers. The new version of the COLAX code was recently tested and preliminary results will be presented.

Paper Details

Date Published: 28 September 2009
PDF: 9 pages
Proc. SPIE 7451, Soft X-Ray Lasers and Applications VIII, 74510U (28 September 2009); doi: 10.1117/12.825511
Show Author Affiliations
Annie Klisnick, CNRS, LIXAM, Univ. Paris-Sud 11 (France)
Olivier Larroche, DIF, Commissariat à l'Énergie Atomique (France)
François de Dortan, CNRS, LIXAM, Univ. Paris-Sud 11 (France)
Jamil Habib, CNRS, LIXAM, Univ. Paris-Sud 11 (France)
Olivier Guilbaud, CNRS, LIXAM, Univ. Paris-Sud 11 (France)

Published in SPIE Proceedings Vol. 7451:
Soft X-Ray Lasers and Applications VIII
James Dunn; Gregory J. Tallents, Editor(s)

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