| Issue |
EPJ Web Conf.
Volume 283, 2023
Ultra High Energy Cosmic Rays (UHECR 2022)
|
|
|---|---|---|
| Article Number | 06016 | |
| Number of page(s) | 4 | |
| Section | Present and Future Detection and Analysis Techniques | |
| DOI | https://doi.org/10.1051/epjconf/202328306016 | |
| Published online | 28 April 2023 | |
https://doi.org/10.1051/epjconf/202328306016
Absolute calibration of the JEM-EUSO photodetection modules
1 Université Paris Cité, CNRS, Astroparticule et Cosmologie, F-75013, Paris, France
2 Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 1(2), Leninskiye Gory, Moscow 119991, Russia
3 Faculty of Physics, Lomonosov Moscow State University, 1(2), Leninskiye Gory, Moscow 119991, Russia
* email: trofimov@apc.in2p3.fr
Published online: 28 April 2023
The JEM-EUSO (Joint Experiment Missions for Extreme Universe Space Observatory) collaboration constructs a series of balloon and orbital telescopes to detect fluorescent UV emission from the Earth atmosphere, with the primary aim to study ultra-high-energy cosmic rays (UHECRs) from space.
The detectors have wide field-of-view (more than 20 degrees FOV), high temporal resolution (1-2.5 µs) and high sensitivity provided by a large aperture. Currently, one of these detectors is operating onboard the International Space Station (Mini-EUSO). The next one is planned to be launched in the spring of 2023 (EUSO-SPB2) and another one is in preparation stage (K-EUSO). These projects use the same photo-detection modules (PDMs) composed of 36 multi-anode photomultiplier tubes (MAPMTs), each with 64 pixels, for a total of 2304 pixels. Mini-EUSO uses one PDM, EUSO-SPB2 uses three and the future full-scale missions will use several tens of PDMs.
In the process of preparing and testing of PDMs, a new technique was developed to characterize their performance and provide absolute calibration of the MAPMTs used in the different JEM-EUSO missions. The method provides the efficiency of each pixel (including the sub-pixel structures), as well as the actual area occupied by the different pixels on the photocathode of the MAPMT.
The method and its application to EUSO-SPB2 PDMs at different high voltages and in different modes of operation are presented.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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