Preliminary results of CCD characterisation at ESA in support of the Euclid visible channel

Nathalie Boudin; Peter Verhoeve; Hans Smit; Udo Telljohann; Ludovic Duvet; Didier Martin

doi:10.1117/12.926209

25 September 2012 Preliminary results of CCD characterisation at ESA in support of the Euclid visible channel

Nathalie Boudin, Peter Verhoeve, Hans Smit, Udo Telljohann, Ludovic Duvet, Didier Martin

Proceedings Volume 8453, High Energy, Optical, and Infrared Detectors for Astronomy V; 845323 (2012) https://doi.org/10.1117/12.926209
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

Euclid is the ESA mission to map the geometry of the dark Universe using two cosmological probes, namely Weak Lensing and Baryonic Acoustic oscillations. The visual imager, a CCD based optical imaging channel will be used to measure the shapes of galaxies in one single wide visual band spanning the wavelength range of 550-920 nm. The focal plane array supports 36 CCDs (4k×4k pixels each) with 0.101 arcsec pixel platescale, giving a geometric field of 0.55 deg². With the weak lensing technique, the mass distribution of the lensing structures can be traced back. The originally baselined CCDs were e2v CCD203-82. Following the results from a dedicated radiation damage test activity on their CCD204 variant, a new version, called 273 has been designed and made available in a front-illuminated version in April 2012. For Euclid, the accuracy with which the shape of the galaxies has to be measured is considerable: 1% and has never been demonstrated. The radiation damage effects will adversely affect this measurement and thus need to be characterized. Therefore, several test campaigns on the characterization of the CCD radiation damages for Euclid are carried out by ESA and by the Euclid Imaging Consortium. For this purpose, a test bench has been implemented at ESTEC to characterize CCD devices, with radiometric measurements, point source illumination and lab simulation of typical Euclid sky images. The preliminary results obtained at ESA on a non-irradiated front-illuminated Euclid prototype CCD 273-84-2-F16 will be shown in this article.

Citation Download Citation

Nathalie Boudin, Peter Verhoeve, Hans Smit, Udo Telljohann, Ludovic Duvet, and Didier Martin "Preliminary results of CCD characterisation at ESA in support of the Euclid visible channel", Proc. SPIE 8453, High Energy, Optical, and Infrared Detectors for Astronomy V, 845323 (25 September 2012); https://doi.org/10.1117/12.926209

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