Tests of charge sharing compensation algorithm implemented in a single pixel counting integrated circuit operating with Si and CdTe pixel detectors

Le résumé fourni par la source

Abstract This study addresses the challenge of charge sharing in hybrid pixel detectors with small pixel pitches. In such detectors, charge generated by a single photon is distributed across adjacent pixels, leading to spectral distortion and degraded energy resolution in single-photon counting (SPC) mode. The paper evaluates the MPIX readout chip equipped with the charge sharing compensation algorithm, implemented both in analog and digital domains, to recover and correctly assign shared charge signals. The MPIX chip features a 96 × 192 — pixel matrix with four energy thresholds and inter-pixel communication, facilitating charge summation among neighboring pixels. The effectiveness of the algorithm was experimentally validated through measurements with CdTe and Si pixel sensors using monochromatic X-rays from fluorescence and radioactive sources, continuous-spectrum X-rays, and precisely controlled laser-induced charge injections. Results demonstrate a significant reduction of spectral distortions caused by charge sharing, and improved energy assignment accuracy. The tests with laser pulses were performed with the frequency range up to 12 MHz. The study confirms that the charge sharing compensation algorithm effectively reconstructs photon energy and assigns events to single pixels, enhancing hybrid pixel detector performance.

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