Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ultra high energy resolution focusing monochromator for inelastic X-ray
  scattering spectrometer   A further development of a focusing monochromator concept for X-ray energy
resolution of 0.1 meV and below is presented. Theoretical analysis of several
optical layouts based on this concept was supported by numerical simulations
performed in the "Synchrotron Radiation Workshop" software package using the
physical-optics approach and careful modeling of partially-coherent synchrotron
(undulator) radiation. Along with the energy resolution, the spectral shape of
the energy resolution function was investigated. It was shown that under
certain conditions the decay of the resolution function tails can be faster
than that of the Gaussian function.

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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph