Spectral performance of single-channel plastic and GAGG scintillator bars of the CUbesat Solar Polarimeter (CUSP)
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| Format: | Preprint |
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2026
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| author | De Angelis, Nicolas Kumar, Abhay Fabiani, Sergio Del Monte, Ettore Costa, Enrico Lombardi, Giovanni Rubini, Alda Soffitta, Paolo Alimenti, Andrea Campana, Riccardo Centrone, Mauro De Cesare, Giovanni Di Cosimo, Sergio Di Persio, Giuseppe Lacerenza, Alessandro Loffredo, Pasqualino Minervini, Gabriele Muleri, Fabio Romano, Paolo Scalise, Emanuele Silva, Enrico Albanesi, Davide Baffo, Ilaria Brienza, Daniele Campomaggiore, Valerio Cucinella, Giovanni Curatolo, Andrea de Iulis, Giulia Del Re, Andrea Di Bari, Vito Di Filippo, Simone Donnarumma, Immacolata Fanelli, Pierluigi Gagliardi, Nicolas Leonetti, Paolo Mergè, Matteo Modenini, Dario Negri, Andrea Pecorella, Daniele Perelli, Massimo Ponti, Alice Sbop, Francesca Tortora, Paolo Turchi, Alessandro Vagelli, Valerio Zaccagnino, Emanuele Zambardi, Alessandro Zazza, Costantino |
| author_facet | De Angelis, Nicolas Kumar, Abhay Fabiani, Sergio Del Monte, Ettore Costa, Enrico Lombardi, Giovanni Rubini, Alda Soffitta, Paolo Alimenti, Andrea Campana, Riccardo Centrone, Mauro De Cesare, Giovanni Di Cosimo, Sergio Di Persio, Giuseppe Lacerenza, Alessandro Loffredo, Pasqualino Minervini, Gabriele Muleri, Fabio Romano, Paolo Scalise, Emanuele Silva, Enrico Albanesi, Davide Baffo, Ilaria Brienza, Daniele Campomaggiore, Valerio Cucinella, Giovanni Curatolo, Andrea de Iulis, Giulia Del Re, Andrea Di Bari, Vito Di Filippo, Simone Donnarumma, Immacolata Fanelli, Pierluigi Gagliardi, Nicolas Leonetti, Paolo Mergè, Matteo Modenini, Dario Negri, Andrea Pecorella, Daniele Perelli, Massimo Ponti, Alice Sbop, Francesca Tortora, Paolo Turchi, Alessandro Vagelli, Valerio Zaccagnino, Emanuele Zambardi, Alessandro Zazza, Costantino |
| contents | Our Sun is the closest X-ray astrophysical source to Earth. As such, it makes a formidable case study to better understand astrophysical processes. Solar flares are in particular very interesting as they are linked to coronal mass ejections as well as magnetic field reconnection sites in the solar atmosphere. Flares can therefore provide insightful information on the physical processes at play on their production sites, but also on the emission and acceleration of energetic charged particles towards our planet, making it a formidable forecasting tool for space weather. While solar flares are critical to understanding magnetic reconnection and particle acceleration, their hard X-ray polarization -- key to distinguishing between competing theoretical models -- remains poorly constrained by existing observations. To address this, we present the CUbesat Solar Polarimeter (CUSP), a mission under development to perform solar flare polarimetry in the 25-100 keV energy range. CUSP consists of a 6U-XL platform hosting a dual-phase Compton polarimeter. The polarimeter is made of a central assembly of four 4x4 arrays of plastic scintillators, each coupled to multi-anode photomultiplier tubes, surrounded by four strips of eight elongated GAGG scintillator bars coupled to avalanche photodiodes. Both types of sensors from Hamamatsu are respectively read out by the MAROC-3A and SKIROC-2A ASICs from Weeroc. In this manuscript, we present the preliminary spectral performances of single plastic and GAGG channels measured in the laboratory using development boards of the ASICs foreseen for the flight model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_00485 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spectral performance of single-channel plastic and GAGG scintillator bars of the CUbesat Solar Polarimeter (CUSP) De Angelis, Nicolas Kumar, Abhay Fabiani, Sergio Del Monte, Ettore Costa, Enrico Lombardi, Giovanni Rubini, Alda Soffitta, Paolo Alimenti, Andrea Campana, Riccardo Centrone, Mauro De Cesare, Giovanni Di Cosimo, Sergio Di Persio, Giuseppe Lacerenza, Alessandro Loffredo, Pasqualino Minervini, Gabriele Muleri, Fabio Romano, Paolo Scalise, Emanuele Silva, Enrico Albanesi, Davide Baffo, Ilaria Brienza, Daniele Campomaggiore, Valerio Cucinella, Giovanni Curatolo, Andrea de Iulis, Giulia Del Re, Andrea Di Bari, Vito Di Filippo, Simone Donnarumma, Immacolata Fanelli, Pierluigi Gagliardi, Nicolas Leonetti, Paolo Mergè, Matteo Modenini, Dario Negri, Andrea Pecorella, Daniele Perelli, Massimo Ponti, Alice Sbop, Francesca Tortora, Paolo Turchi, Alessandro Vagelli, Valerio Zaccagnino, Emanuele Zambardi, Alessandro Zazza, Costantino Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics Space Physics Our Sun is the closest X-ray astrophysical source to Earth. As such, it makes a formidable case study to better understand astrophysical processes. Solar flares are in particular very interesting as they are linked to coronal mass ejections as well as magnetic field reconnection sites in the solar atmosphere. Flares can therefore provide insightful information on the physical processes at play on their production sites, but also on the emission and acceleration of energetic charged particles towards our planet, making it a formidable forecasting tool for space weather. While solar flares are critical to understanding magnetic reconnection and particle acceleration, their hard X-ray polarization -- key to distinguishing between competing theoretical models -- remains poorly constrained by existing observations. To address this, we present the CUbesat Solar Polarimeter (CUSP), a mission under development to perform solar flare polarimetry in the 25-100 keV energy range. CUSP consists of a 6U-XL platform hosting a dual-phase Compton polarimeter. The polarimeter is made of a central assembly of four 4x4 arrays of plastic scintillators, each coupled to multi-anode photomultiplier tubes, surrounded by four strips of eight elongated GAGG scintillator bars coupled to avalanche photodiodes. Both types of sensors from Hamamatsu are respectively read out by the MAROC-3A and SKIROC-2A ASICs from Weeroc. In this manuscript, we present the preliminary spectral performances of single plastic and GAGG channels measured in the laboratory using development boards of the ASICs foreseen for the flight model. |
| title | Spectral performance of single-channel plastic and GAGG scintillator bars of the CUbesat Solar Polarimeter (CUSP) |
| topic | Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics Space Physics |
| url | https://arxiv.org/abs/2601.00485 |