We have developed a large CdTe pixel detector with dimensions of 23.7 x 13.0 mm and a pixel size of 448 x 448 um^2. The detector is based on recent technologies of an uniform CdTe single crystal, a two-dimensional ASIC, and stud bump-bonding to connect pixel electrodes on the CdTe surface to the ASIC. Good spectra are obtained from 1051 pixels out of total 1056 pixels. When we operate the detector at -50 C, the energy resolution is 0.67 keV and 0.99 keV at 14 keV and 60 keV, respectively. Week-long stability of the detector is confirmed at operating temperatures of both -50 C and -20 C. The detector also shows high uniformity: the peak positions for all pixels agree to within 0.82%, and the average of the energy resolution is 1.04 keV at a temperature of -50 C. When we normalized the peak area by the total counts detected by each pixel, a variation of 2.1 % is obtained.
@article{arxiv.astro-ph/0410040,
title = {Development of Uniform CdTe Pixel Detectors Based on Caltech ASIC},
author = {K. Oonuki and H. Inoue and K. Nakazawa and T. Mitani and T. Tanaka and T. Takahashi and C. M. H. Chen and W. R. Cook and F. A. Harrison},
journal= {arXiv preprint arXiv:astro-ph/0410040},
year = {2009}
}
Comments
11pages, 17figures, accepted for publication in Proc. SPIE 2004