Modelling Gaia CCD pixels with Silvaco 3D engineering software
G. M. Seabroke (1,2), T. Prod'homme (3), G. Hopkinson (4), D. Burt, (5), M. Robbins (5), A. Holland (1) ((1) Planetary & Space Sciences Research, Institute, The Open University, Milton Keynes, UK, (2) Mullard Space Science, Laboratory, University College London, UK
TL;DR
This paper presents a 3D engineering software model of Gaia CCD pixels to interpret measurements and simulate electron densities, aiding calibration and radiation damage correction for Gaia's high-precision astrometry.
Contribution
The paper introduces a detailed 3D model of Gaia CCD pixels using Silvaco software, enabling interpretation of measurements and simulation of electron densities for radiation damage analysis.
Findings
Interpretation of SBC capacity measurements in manufacturing tolerances
Derivation of electron densities within charge packets
Enhanced calibration for radiation damage correction
Abstract
Gaia will only achieve its unprecedented measurement accuracy requirements with detailed calibration and correction for radiation damage. We present our Silvaco 3D engineering software model of the Gaia CCD pixel and two of its applications for Gaia: (1) physically interpreting supplementary buried channel (SBC) capacity measurements (pocket-pumping and first pixel response) in terms of e2v manufacturing doping alignment tolerances; and (2) deriving electron densities within a charge packet as a function of the number of constituent electrons and 3D position within the charge packet as input to microscopic models being developed to simulate radiation damage.
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