Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hard X-Ray Phase-Contrast Laboratory Microscope Based on Three-Block
  Fresnel Zone Plate Interferometer   A device based on a three-block Fresnel zone plate interferometer is proposed
for hard X-ray phase-contrast imaging. The device combines a low requirement
for the coherence of the initial radiation (the interferometer operates in the
amplitude division mode) with an optical magnification of the image. A
numerical simulation of the image formation is carried out, taking into account
the limited source-interferometer distance, the size and spectral width of the
X-ray source. The calculations show that the proposed set-up can be used as a
phase-contrast microscope using laboratory hard X-ray sources.

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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: chao-dyn
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: nucl-ex
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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: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ph