Author:
Parsons S.,Hall D.,Buggey T.,Holland A.,Verhoeve P.
Abstract
Abstract
The soft X-ray imager (SXI) on the SMILE mission uses two
large 4510x4510 back illuminated CCD370s to detect X-rays in the
0.2–2 keV range. These devices take heritage from the optical
imaging PLATO mission CCD270s and have been optimised for low energy
signals by including a parallel supplementary buried channel (SBC)
which should reduce the volume of the charge cloud and thereby
reduce the number of traps it interacts with as it is transferred
through the CCD.
The charge transfer performance improvement between the CCD270 and
the CCD370 has been simulated using a combination of Silvaco and
Matlab models to predict its characteristics pre-fabrication over a
102–105 electron signal range. Trap pumping measurements
have been taken on both devices to count the number of traps present
and hence calculate the mean amount of traps that exist per pixel
across the range of signal levels. The trap pumping results are used
to calculate a charge transfer performance improvement that shows
good agreement with the simulated values, especially in the SXI
science band.
These results bring added confidence to the early performance
modelling of the SMILE SXI instrument and is a good indicator that
the simulations are accurate enough to be used to model devices with
more advanced geometries such as an SBC and can be used in future
CCD missions, where radiation-hardness and hence good charge
transfer characteristics are key.
Subject
Mathematical Physics,Instrumentation
Cited by
1 articles.
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1. Soft X-ray performance of an optimised charge-coupled device for astronomy;Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment;2024-09