Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Characterization of Novel Thin N-in-P Planar Pixel Modules for the ATLAS
  Inner Tracker Upgrade   The ATLAS experiment will undergo a major upgrade of the tracker system in
view of the high luminosity phase of the LHC (HL-LHC) to start operation in
2026. The most severe challenges are to be faced by the innermost layers of the
pixel detector which will have to withstand a radiation fluence of up to
$1.4\times10^{16}\,$n$_\text{eq}$/cm$^{2}$. Thin planar pixel modules are
promising candidates to instrument these layers, thanks to the small material
budget and their high charge collection efficiency after irradiation. Sensors
of $100-200\,\mu$m thickness, interconnected to FE-I4 read-out chips, are
characterized with radioactive sources as well as testbeams at the CERN-SPS and
DESY. The performance of sensors irradiated up to a fluence of $5\times
10^{15}\,$n$_\text{eq}$/cm$^{2}$ is compared in terms of charge collection and
hit efficiency. Highly segmented sensors are a challenge for the tracking in
the forward region of the pixel system at the HL-LHC. To reproduce the
performance of $50$x$50\,\mu$m$^2$ pixels at high pseudo-rapidities, FE-I4
compatible planar pixel sensors are studied before and after irradiation in
beam tests at high incidence angle ($80^\circ$) with respect to the short pixel
direction. Results on cluster shape and hit efficiency will be shown.

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The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
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The categories of this paper are: cs
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The categories of this paper are: math