The optical detector systems of UVES, the echelle spectrograph for the UT2 kueyen telesope at the ESO paranal observatory

摘要

This paper presents the design, construction and performance parameters for the optical detector systems for UVES (1), the echelle spectrograph for the UT2 Kueyen Telescope at the ESO paranal. A general overview at system level with a description of the individual components is also given. Emphasis is given on the CCD detectors and their performance. The two arms are equipped with large science CCD detectors, one single chip in the blue arm and a mosaic of two in the red. The blue CCD is a 2K x 4K, 15 mu m pixel size thinned EEV CCD-44. The mosaic in the red arm is made of an EEV chip of the s ame type and an MIT/LL CCID-20 chip (2K x 4K), which features a higher NIR QE and reduced fringing for the redder part of the spectral range. The read noise archived with th CCDs at the telescope is less than 2 electrons for the EEV CCDs and less than 3 electrons for the MIT/LL CC at a readout speed of 50 kpixel/sec/port. The systems offer a variety of readout modes, binning options and readout speeds up to 625 kilopixel per second per port with linearity variations better than 1