Test-Beam Performance of the AstroPix Silicon Sensor for Imaging Calorimetry
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2026
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| author | Hong, Yoonha Bok, Jeongsu An, Geunpil Bae, Joonsuk Bae, Yunseul Caputo, Regina Eo, Yun Ham, Wooseok Heo, Woohyeon Hong, Yoonha Jadhav, Manoj Jang, Seo Yun Jeong, Jinryong Jo, Hyon-Suk Joosten, Sylvester Kim, Beomkyu Kim, Bobae Kim, Chong Kim, Dongguk Kim, Minsuk Kim, Shin Hyung Kim, Woojong Ko, Wonjun Lee, Changhui Lee, Hyungjun Lee, Jason Sang Hun Lee, Jongwon Lee, Kyeongpil Lee, Sehwook Park, Sangwoo Ryu, Jaehyeok Seo, Bogyeong Metcalfe, Jessica Shim, Minsub Shin, Junseop Yoo, Hwidong Żurek, Maria Lim, Sanghoon |
| author_facet | Hong, Yoonha Bok, Jeongsu An, Geunpil Bae, Joonsuk Bae, Yunseul Caputo, Regina Eo, Yun Ham, Wooseok Heo, Woohyeon Hong, Yoonha Jadhav, Manoj Jang, Seo Yun Jeong, Jinryong Jo, Hyon-Suk Joosten, Sylvester Kim, Beomkyu Kim, Bobae Kim, Chong Kim, Dongguk Kim, Minsuk Kim, Shin Hyung Kim, Woojong Ko, Wonjun Lee, Changhui Lee, Hyungjun Lee, Jason Sang Hun Lee, Jongwon Lee, Kyeongpil Lee, Sehwook Park, Sangwoo Ryu, Jaehyeok Seo, Bogyeong Metcalfe, Jessica Shim, Minsub Shin, Junseop Yoo, Hwidong Żurek, Maria Lim, Sanghoon |
| contents | AstroPix is a high-voltage CMOS HVCMOS monolithic active pixel sensor MAPS developed for future space-based gamma-ray missions. It is also a candidate technology for the imaging layer of the Barrel Imaging Calorimeter BIC in the ePIC experiment at the future Electron-Ion Collider EIC. We report the first AstroPix test-beam results obtained at the KEK Photon Factory Advanced Ring PF-AR and the CERN Proton Synchrotron PS T10 beam line in 2025, using the third prototype AstroPix-v3. AstroPix-v3 sensors were operated as both standalone tracking layers and imaging layers interleaved with prototype lead/scintillating-fiber Pb/SciFi calorimeter modules, using electron and hadron beams in the few-GeV/c momentum range. Event synchronization between the continuous readout of AstroPix-v3 and the trigger-based readout of the Pb/SciFi calorimeter was achieved using a common timestamp. The AstroPix-v3 sensors exhibit stable performance, reaching a maximum hit efficiency of 68 percent at a bias voltage of -400 V under pion-dominated beam conditions. When combined with the Pb/SciFi calorimeter, the AstroPix layers successfully capture the development of electromagnetic showers. Using Cherenkov-based particle identification, electron-induced events exhibit significantly higher hit multiplicities and broader spatial distributions than pion-induced events, thereby providing clear discrimination between electromagnetic and hadronic showers. These results demonstrate that AstroPix-v3 provides effective, high-granularity imaging of shower development and is well suited as an imaging layer in future calorimeter systems for both collider and space-based experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_07681 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Test-Beam Performance of the AstroPix Silicon Sensor for Imaging Calorimetry Hong, Yoonha Bok, Jeongsu An, Geunpil Bae, Joonsuk Bae, Yunseul Caputo, Regina Eo, Yun Ham, Wooseok Heo, Woohyeon Hong, Yoonha Jadhav, Manoj Jang, Seo Yun Jeong, Jinryong Jo, Hyon-Suk Joosten, Sylvester Kim, Beomkyu Kim, Bobae Kim, Chong Kim, Dongguk Kim, Minsuk Kim, Shin Hyung Kim, Woojong Ko, Wonjun Lee, Changhui Lee, Hyungjun Lee, Jason Sang Hun Lee, Jongwon Lee, Kyeongpil Lee, Sehwook Park, Sangwoo Ryu, Jaehyeok Seo, Bogyeong Metcalfe, Jessica Shim, Minsub Shin, Junseop Yoo, Hwidong Żurek, Maria Lim, Sanghoon Instrumentation and Detectors AstroPix is a high-voltage CMOS HVCMOS monolithic active pixel sensor MAPS developed for future space-based gamma-ray missions. It is also a candidate technology for the imaging layer of the Barrel Imaging Calorimeter BIC in the ePIC experiment at the future Electron-Ion Collider EIC. We report the first AstroPix test-beam results obtained at the KEK Photon Factory Advanced Ring PF-AR and the CERN Proton Synchrotron PS T10 beam line in 2025, using the third prototype AstroPix-v3. AstroPix-v3 sensors were operated as both standalone tracking layers and imaging layers interleaved with prototype lead/scintillating-fiber Pb/SciFi calorimeter modules, using electron and hadron beams in the few-GeV/c momentum range. Event synchronization between the continuous readout of AstroPix-v3 and the trigger-based readout of the Pb/SciFi calorimeter was achieved using a common timestamp. The AstroPix-v3 sensors exhibit stable performance, reaching a maximum hit efficiency of 68 percent at a bias voltage of -400 V under pion-dominated beam conditions. When combined with the Pb/SciFi calorimeter, the AstroPix layers successfully capture the development of electromagnetic showers. Using Cherenkov-based particle identification, electron-induced events exhibit significantly higher hit multiplicities and broader spatial distributions than pion-induced events, thereby providing clear discrimination between electromagnetic and hadronic showers. These results demonstrate that AstroPix-v3 provides effective, high-granularity imaging of shower development and is well suited as an imaging layer in future calorimeter systems for both collider and space-based experiments. |
| title | Test-Beam Performance of the AstroPix Silicon Sensor for Imaging Calorimetry |
| topic | Instrumentation and Detectors |
| url | https://arxiv.org/abs/2605.07681 |