Charge calibration of MALTA2, a radiation hard depleted monolithic active pixel sensor

2025/01/23 by Fasselt, Lucian, Tortajada, Ignacio Asensi, Behera, Prafulla +22 · 1 citation
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Instrumentation and Detectors (physics.ins-det)

paper · doi:10.48550/arxiv.2501.13562

Abstract

MALTA2 is a depleted monolithic active pixel sensor (DMAPS) designed for tracking at high rates and typically low detection threshold of ∼150 e^-. A precise knowledge of the threshold is crucial to understanding the charge collection in the pixel and specifying the environment for sensor application. A simple procedure is developed to calibrate the threshold to unit electrons making use of a dedicated charge injection circuit and an Fe-55 source with dominant charge deposition of 1600 e^-. The injection voltage is determined which corresponds to the injection under Fe-55 exposure and is the basis for charge calibration. The charge injection circuit incorporates a capacitance with design value of \mathrmC_inj= 230 aF. Experimentally, the average capacitance value for non-irradiated samples is found to be \mathrmC_inj,exp= 257 aF. The 12 % divergence motivates the need for the presented precise calibration procedure, which is proposed to be performed for each MALTA2 sensor.

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