Evaluation of gamma-ray response of the AstroPix4 HV-CMOS active pixel sensor
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| Formato: | Preprint |
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2025
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| author | Suda, Yusuke Caputo, Regina Violette, Daniel Sommer, Grant Striebig, Nicolas Jadhav, Manoj Fukazawa, Yasushi Kierans, Carolyn Leys, Richard Metcalfe, Jessica Nakano, Norito Perić, Ivan Perkins, Jeremy S. Tajima, Hiroyasu |
| author_facet | Suda, Yusuke Caputo, Regina Violette, Daniel Sommer, Grant Striebig, Nicolas Jadhav, Manoj Fukazawa, Yasushi Kierans, Carolyn Leys, Richard Metcalfe, Jessica Nakano, Norito Perić, Ivan Perkins, Jeremy S. Tajima, Hiroyasu |
| contents | AstroPix is a novel high-voltage CMOS active pixel sensor being developed for a next generation gamma-ray space telescope, AMEGO-X. To meet AMEGO-X instrument requirements, AstroPix must achieve full depletion of its $500~\rm{μm}$ thick, $500~\rm{μm}$-pitch pixels. It must be sensitive to gamma rays in the range of $25-700$ keV, with the energy resolution at 122 keV of $<10$%. Furthermore, given the space-based nature of AMEGO-X, the power consumption of AstroPix needs to be lower than $1.5~\rm{mW/{cm}^2}$. We report the gamma-ray response of the latest version of AstroPix, AstroPix4. The chip contains $16\times 13$ array of $500~\rm{μm}$-pitch pixels. The power consumption is estimated to be about $2~\rm{mW/{cm}^2}$, which is approximately half the power of the previous AstroPix version. The input capacitance is reduced, allowing for the detection of the 14 keV photopeak from $\rm{^{57}Co}$ and a moderate energy resolution of 14% at 122 keV. The dynamic range is estimated to be in the range from 14 keV to $\sim250$ keV. We found that the sensor depletion layer expands as expected and the measured depletion depth is approximately $90~\rm{μm}$ when biased at $-240$ V. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_21618 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evaluation of gamma-ray response of the AstroPix4 HV-CMOS active pixel sensor Suda, Yusuke Caputo, Regina Violette, Daniel Sommer, Grant Striebig, Nicolas Jadhav, Manoj Fukazawa, Yasushi Kierans, Carolyn Leys, Richard Metcalfe, Jessica Nakano, Norito Perić, Ivan Perkins, Jeremy S. Tajima, Hiroyasu Instrumentation and Methods for Astrophysics AstroPix is a novel high-voltage CMOS active pixel sensor being developed for a next generation gamma-ray space telescope, AMEGO-X. To meet AMEGO-X instrument requirements, AstroPix must achieve full depletion of its $500~\rm{μm}$ thick, $500~\rm{μm}$-pitch pixels. It must be sensitive to gamma rays in the range of $25-700$ keV, with the energy resolution at 122 keV of $<10$%. Furthermore, given the space-based nature of AMEGO-X, the power consumption of AstroPix needs to be lower than $1.5~\rm{mW/{cm}^2}$. We report the gamma-ray response of the latest version of AstroPix, AstroPix4. The chip contains $16\times 13$ array of $500~\rm{μm}$-pitch pixels. The power consumption is estimated to be about $2~\rm{mW/{cm}^2}$, which is approximately half the power of the previous AstroPix version. The input capacitance is reduced, allowing for the detection of the 14 keV photopeak from $\rm{^{57}Co}$ and a moderate energy resolution of 14% at 122 keV. The dynamic range is estimated to be in the range from 14 keV to $\sim250$ keV. We found that the sensor depletion layer expands as expected and the measured depletion depth is approximately $90~\rm{μm}$ when biased at $-240$ V. |
| title | Evaluation of gamma-ray response of the AstroPix4 HV-CMOS active pixel sensor |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2507.21618 |