5 August 2016 Comparison of persistence in spot versus flat field illumination and single pixel response on a Euclid HAWAII-2RG at ESTEC
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Euclid is an ESA mission to map the geometry of the dark Universe with a planned launch date in 2020. Euclid is optimised for two primary cosmological probes, weak gravitational lensing and galaxy clustering. They are implemented through two science instruments on-board Euclid, a visible imager (VIS) and a near-infrared spectro-photometer (NISP), which are being developed and built by the Euclid Consortium instrument development teams. The NISP instrument contains a large focal plane assembly of 16 Teledyne HgCdTe HAWAII-2RG detectors with 2.3μm cut-off wavelength and SIDECAR readout electronics. While most Euclid NISP detector system on-ground tests involve flat-field illumination, some performance tests require point-like sources to be projected onto the detector. For this purpose a dedicated test bench has been developed by ESA at ESTEC including a spot projector capable of generating a Euclid-like PSF. This paper describes the test setup and results from two characterisation tests involving the spot projector. One performance parameter to be addressed by Euclid is image (charge) persistence resulting from previous exposures in the science acquisition sequence. To correlate results from standard on-ground persistence tests from flat-field illumination to realistic scenes, the persistence effect from spot illumination has been evaluated and compared to the flat-field. Another important aspect is the photometric impact of intra-pixel response variations. Preliminary results of this measurement on a single pixel are presented.
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Pierre-Elie Crouzet, Pierre-Elie Crouzet, Ludovic Duvet, Ludovic Duvet, Paolo Strada, Paolo Strada, Ralf Kohley, Ralf Kohley, Remi Barbier, Remi Barbier, Thierry Beaufort, Thierry Beaufort, Sander Blommaert, Sander Blommaert, Bart Butler, Bart Butler, Gertjan Van Duinkerken, Gertjan Van Duinkerken, David Gooding, David Gooding, Joerg Ter Haar, Joerg Ter Haar, Jerko Heijnen, Jerko Heijnen, Frederic Lemmel, Frederic Lemmel, Cornelis Van der Luijt, Cornelis Van der Luijt, Hans Smit, Hans Smit, Visser Ivo, Visser Ivo, "Comparison of persistence in spot versus flat field illumination and single pixel response on a Euclid HAWAII-2RG at ESTEC", Proc. SPIE 9915, High Energy, Optical, and Infrared Detectors for Astronomy VII, 99151E (5 August 2016); doi: 10.1117/12.2230836; https://doi.org/10.1117/12.2230836

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