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23 April 2024 |
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The Impact of Interpixel Capacitance on WFIRST PSFs | | Arun Kannawadi
; Charles A. Shapiro
; Rachel Mandelbaum
; Christopher M. Hirata
; Jeffrey W. Kruk
; Jason D. Rhodes
; | | Date: |
4 Dec 2015 | | Abstract: | Unlike optical CCDs, near-infrared detectors, which are based on CMOS hybrid
readout technology, typically suffer from electrical crosstalk between the
pixels. The interpixel capacitance (IPC) responsible for the crosstalk affects
the point-spread function (PSF) of the telescope, increasing the size and
modifying the shape of all objects in the images while correlating the Poisson
noise. Upcoming weak lensing surveys that use these detectors, such as WFIRST,
place stringent requirements on the PSF size and shape (and the level at which
these are known), which in turn must be translated into requirements on IPC. To
facilitate this process, we present a first study of the effect of IPC on
WFIRST PSF sizes and shapes. Realistic PSFs are forward-simulated from physical
principles for each WFIRST bandpass. We explore how the PSF size and shape
depends on the range of IPC coupling with pixels that are connected along an
edge or corner; for the expected level of IPC in WFIRST, IPC increases the PSF
sizes by $sim$5\%. We present a linear fitting formula that describes the
uncertainty in the PSF size or shape due to uncertainty in the IPC, which could
arise for example due to unknown time evolution of IPC as the detectors age or
due to spatial variation of IPC across the detector. We also study of the
effect of a small anisotropy in the IPC, which further modifies the PSF shapes.
Our results are a first, critical step in determining the hardware and
characterization requirements for the detectors used in the WFIRST survey. | | Source: | arXiv, 1512.1570 | | Services: | Forum | Review | PDF | Favorites | |
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