| Article | |
| Title | Equalization method for Medipix3RX |
| Author(s) | Rinkel, Jean (LNLS, Campinas) ; Magalhães, Debora (LNLS, Campinas) ; Wagner, Franz (LNLS, Campinas) ; Frojdh, Erik (CERN) ; Ballabriga Sune, Rafael (CERN) |
| Publication | 2015 |
| In: | Nucl. Instrum. Methods Phys. Res., A 801 (2015) 1-6 |
| DOI | 10.1016/j.nima.2015.08.029 |
| Subject category | Detectors and Experimental Techniques |
| Abstract | This paper describes a new method of threshold equalization for X-ray detectors based on the Medipix3RX ASIC, using electrical pulses to calibrate and correct for the threshold dispersion between pixels. This method involves a coarse threshold tuning, based on two 8 bits global DACs and which sets the range of variation of the threshold values; and a fine-tuning, based on two 5-bits adjustment DACs per pixel. As our fine-tuning approach is based on a state-of-the-art methodology, our coarse tuning relies on an original theoretical model. This model takes into account the noise level of the ASIC, which varies with temperature and received radiation dose. The experimental results using 300 μm Si sensor and Kα fluorescence of Zn show a global energy resolution improvement of 14% compared to previous equalization methods. We compared these results with the best achievable global energy resolution given by the resolution of individual pixels and concluded that the remaining 14% difference was due to the discretization error limited by the number of equalization bits. |
| Copyright/License | publication: © 2015-2024 CERN (License: CC-BY-4.0) |
Record created 2016-06-15, last modified 2022-08-10
