Description of the UCam detector control system with a particularemphasis to a development of 4Kx4K camera systems

摘要

This paper describes the features and functionality of the UCam (UKATC Universal Camera Control and Data Acquisition) detector control system with a particular emphasis on development and testing of two 4K x 4K CCD camera systems built recently at UKATC and delivered to a group of telescopes in India. These two camera systems use two variants of an e2v CCD203 device; a 4kx4k standard back-thinned device and a deep depleted silicon device. Apart from the expected differences with the spectral response of these devices, other performance differences have been observed between the two systems such as conversion gain non-linearity, electrical crosstalk between outputs, fringing etc. which are thought to be related to the silicon thickness. Both these detectors show charge trapping during device power on or when saturated. The effects of this charge trapping and a solution implemented to minimise it will be presented. The configuration of the UCAM system, custom built detector mount and fanout board and the overall performance of these camera systems will also be presented.