Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of electron scattering from registration detector in a MAC-E
  type spectrometer   There is a proposal to search for a sterile neutrino in a few keV mass range
by the "Troitsk nu-mass" facility. In order to estimate sterile neutrino mixing
one needs to make precision spectrum measurements well below the endpoint using
the existing electrostatic spectrometer with a magnetic adiabatic collimation,
or MAC-E filter. The expected signature will be a kink in the electron energy
spectrum in tritium beta-decay. In this article we consider the systematic
effect of electron backscattering on the detector used in the spectrometer. For
this purpose we provide a set of Monte-Carlo simulation results of electron
backscattering on a silicon detector with a thin golden window with realistic
electric and magnetic fields in the spectrometer. We have found that the
probability of such an effect reaches up to 20-30\%. The scattered electron
could be reflected backwards to the detector by electrostatic field or by
magnetic mirror. There is also a few percent probability to escape from the
spectrometer through its entrance. A time delay between the scattering moment
on the detector and the return of the reflected electron can reach a couple of
microseconds in the Troitsk spectrometer. Such estimations are critical for the
planning upgrades of the detector and the registration electronics.

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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: hep-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: stat
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph