Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Time-dependent dynamical Bragg diffraction in crystals by beam
  propagation method (BPM)   In this paper we describe how to solve time dependent x-ray dynamic
diffraction problems in distorted crystal using a beam propagation method
(BPM). We will show examples of using the BPM method to simulate propagation of
x-ray beams in deformed crystals in space an time domain which are relevant to
performance of x-ray optics at x-ray Free Electron Lasers

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The categories of this paper are: cond-mat
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The categories of this paper are: q-bio
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The categories of this paper are: hep-th
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: hep-ex
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The categories of this paper are: chem-ph