Charge calibration of MALTA2, a radiation hard depleted monolithic active pixel sensor
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arXiv
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2025
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| author | Fasselt, Lucian Tortajada, Ignacio Asensi Behera, Prafulla Berlea, Dumitru Vlad Bortoletto, Daniela Buttar, Craig Dao, Valerio Dash, Ganapati de Acedo, Leyre Flores Sanz Gazi, Martin Gonella, Laura González, Vicente Haberl, Sebastian Inada, Tomohiro Jana, Pranati Li, Long Pernegger, Heinz Riedler, Petra Snoeys, Walter Sánchez, Carlos Solans van Rijnbach, Milou Núñez, Marcos Vázquez Vijay, Anusree Weick, Julian Worm, Steven |
| author_facet | Fasselt, Lucian Tortajada, Ignacio Asensi Behera, Prafulla Berlea, Dumitru Vlad Bortoletto, Daniela Buttar, Craig Dao, Valerio Dash, Ganapati de Acedo, Leyre Flores Sanz Gazi, Martin Gonella, Laura González, Vicente Haberl, Sebastian Inada, Tomohiro Jana, Pranati Li, Long Pernegger, Heinz Riedler, Petra Snoeys, Walter Sánchez, Carlos Solans van Rijnbach, Milou Núñez, Marcos Vázquez Vijay, Anusree Weick, Julian Worm, Steven |
| contents | MALTA2 is a depleted monolithic active pixel sensor (DMAPS) designed for tracking at high rates and typically low detection threshold of $\sim150\,\mathrm{e^-}$. 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 $1600\, \mathrm{e^-}$. 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 $\mathrm{C_{inj}}=$ 230 aF. Experimentally, the average capacitance value for non-irradiated samples is found to be $\mathrm{C_{inj,exp}}=$ 257 aF. The 12 % divergence motivates the need for the presented precise calibration procedure, which is proposed to be performed for each MALTA2 sensor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_13562 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Charge calibration of MALTA2, a radiation hard depleted monolithic active pixel sensor Fasselt, Lucian Tortajada, Ignacio Asensi Behera, Prafulla Berlea, Dumitru Vlad Bortoletto, Daniela Buttar, Craig Dao, Valerio Dash, Ganapati de Acedo, Leyre Flores Sanz Gazi, Martin Gonella, Laura González, Vicente Haberl, Sebastian Inada, Tomohiro Jana, Pranati Li, Long Pernegger, Heinz Riedler, Petra Snoeys, Walter Sánchez, Carlos Solans van Rijnbach, Milou Núñez, Marcos Vázquez Vijay, Anusree Weick, Julian Worm, Steven Instrumentation and Detectors High Energy Physics - Experiment MALTA2 is a depleted monolithic active pixel sensor (DMAPS) designed for tracking at high rates and typically low detection threshold of $\sim150\,\mathrm{e^-}$. 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 $1600\, \mathrm{e^-}$. 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 $\mathrm{C_{inj}}=$ 230 aF. Experimentally, the average capacitance value for non-irradiated samples is found to be $\mathrm{C_{inj,exp}}=$ 257 aF. The 12 % divergence motivates the need for the presented precise calibration procedure, which is proposed to be performed for each MALTA2 sensor. |
| title | Charge calibration of MALTA2, a radiation hard depleted monolithic active pixel sensor |
| topic | Instrumentation and Detectors High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2501.13562 |