Observing Ultra-High Energy Cosmic Rays using Camera Image Sensors
July 05, 2021
We propose a new approach for observing UHECR by detecting charged particles in the core region of EAS using a cost-effective and compact detector with a CMOS camera image sensor. In general, the core region of EAS is excluded from the measurement due to the very high particle density at which the signal saturates. However, the results of the EAS simulation predict that the particle density in the core depends on the distance from the axis and the angular distribution depends on the arrival direction of the primary cosmic ray. Therefore, if we have a detector that does not saturate even in high-density areas, the core might be useful for collecting information about EAS effectively. Meanwhile, CMOS Camera image sensors are sensitive to ionizing radiations in addition to optical photons. The length of the track in the digital images is related to depletion thickness and incident angle to the sensor’s surface. When depletion thickness is evident, we can reconstruct the incident angles of primary particles roughly. Since these sensors are thin and small, they have the advantage of being able to observe without saturation, even in high-density regions. We demonstrate the simulation result to show the characteristics of UHECRs core and the reaction of sensors for charged particles. We also report the thickness of the depletion layer estimated from our experimental results using a prototype of the CMOS sensors with Raspberry PI .
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