Trap pumping schemes for the Euclid CCD273 detector: characterisation of electrodes and defects

Skottfelt, J.; Hall, D.J.; Dryer, B.; Bush, N.; Campa, J.; Gow, J.P.D.; Holland, A.D.; Jordan, D. and Burt, D. (2017). Trap pumping schemes for the Euclid CCD273 detector: characterisation of electrodes and defects. Journal of Instrumentation, 12, article no. C12033.

DOI: https://doi.org/10.1088/1748-0221/12/12/C12033

Abstract

The VISible imager instrument (VIS) on board the Euclid mission will deliver high resolution shape measurements of galaxies down to very faint limits (R ~ 25 at 10σ) in a large part of the sky, in order to infer the distribution of dark matter in the Universe. To help mitigate radiation damage effects that will accumulate in the detectors over the mission lifetime, the properties of the radiation induced traps needs to be known with as high precision as possible. For this purpose the trap pumping method will be employed as part of the in-orbit calibration routines. Using trap pumping it is possible to identify and characterise single traps in a Charge-Coupled Device (CCD), thus providing information such as the density, emission time constants and sub-pixel positions of the traps in the detectors. This paper presents the trap pumping algorithms used for the radiation testing campaign of the CCD273 detectors, performed by the Centre for Electronic Imaging (CEI) at the Open University, that will be used for the VIS instrument. The CCD273 is a four-phase device with uneven phase widths, which complicates the trap pumping analysis. However, we find that by optimising the trap pumping algorithms and analysis routines, it is possible to obtain sub-pixel and even sub-phase positional information about the traps. Further, by comparing trap pumping data with simulations, it is possible to gain more information about the effective electrode widths of the device.

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About

• Item ORO ID
• 52705
• Item Type
• Journal Item
• ISSN
• 1748-0221
• Extra Information
• Presented at the 11th International Conference on Position Sensitive Detectors, 3–8 September 2017, The Open University, Walton Hall, Milton Keynes, UK.
• Keywords
• detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc); detectors for UV, visible and IR photons; data analysis; space instrumentation
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Research Group
• Centre for Electronic Imaging (CEI)
  ?? space ??
• Copyright Holders
• © 2017 IOP Publishing Ltd and Sissa Medialab
• Depositing User
• Jesper Skottfelt