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Proceedings Paper

Propagation of coherent light pulses with PHASE
Author(s): J. Bahrdt; U. Flechsig; W. Grizolli; F. Siewert
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Paper Abstract

The current status of the software package PHASE for the propagation of coherent light pulses along a synchrotron radiation beamline is presented. PHASE is based on an asymptotic expansion of the Fresnel-Kirchhoff integral (stationary phase approximation) which is usually truncated at the 2nd order. The limits of this approximation as well as possible extensions to higher orders are discussed. The accuracy is benchmarked against a direct integration of the Fresnel-Kirchhoff integral. Long range slope errors of optical elements can be included by means of 8th order polynomials in the optical element coordinates w and l. Only recently, a method for the description of short range slope errors has been implemented. The accuracy of this method is evaluated and examples for realistic slope errors are given. PHASE can be run either from a built-in graphical user interface or from any script language. The latter method provides substantial flexibility. Optical elements including apertures can be combined. Complete wave packages can be propagated, as well. Fourier propagators are included in the package, thus, the user may choose between a variety of propagators. Several means to speed up the computation time were tested - among them are the parallelization in a multi core environment and the parallelization on a cluster.

Paper Details

Date Published: 5 September 2014
PDF: 18 pages
Proc. SPIE 9209, Advances in Computational Methods for X-Ray Optics III, 920908 (5 September 2014); doi: 10.1117/12.2065228
Show Author Affiliations
J. Bahrdt, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)
U. Flechsig, Paul Scherrer Institut (Switzerland)
W. Grizolli, Lund Univ. (Sweden)
F. Siewert, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (Germany)

Published in SPIE Proceedings Vol. 9209:
Advances in Computational Methods for X-Ray Optics III
Manuel Sanchez del Rio; Oleg Chubar, Editor(s)

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