Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling Charge Transfer Inefficiency in the Chandra Advanced CCD
  Imaging Spectrometer   The front-illuminated (FI) CCDs in the Advanced CCD Imaging Spectrometer
(ACIS) on the Chandra X-ray Observatory (Chandra) were damaged in the extreme
environment of the Earth's radiation belts, causing charge traps that result in
enhanced charge transfer inefficiency (CTI) during parallel readout. This
causes row-dependent gain, event grade `morphing' (spatial redistribution of
charge) and energy resolution degradation.
  The ACIS back-illuminated (BI) CCDs also exhibit pronounced CTI due to their
manufacturing. It is mild enough that position-dependent energy resolution is
not seen, but it is present in both parallel and serial registers. This CTI
also changes the gain and event grades, in a spatially complicated way as
parallel and serial CTI interact.
  Given these realities, we have developed and tuned a phenomenological model
of CTI for both FI and BI CCDs and incorporated it into our Monte Carlo
simulations of the ACIS CCDs. It models charge loss and the spatial
redistribution of charge (trailing), thus reproducing the spatially-dependent
gain and grade distribution seen in all ACIS CCDs and the row-dependent energy
resolution seen in the FI devices. Here we explore the evidence for CTI,
compare our simulations to data, and present a technique for CTI correction
based on forward modeling.

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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th