학술논문
Background discrimination with a Micromegas detector prototype and veto system for BabyIAXO
Document Type
Working Paper
Author
Altenmüller, K.; Castel, J. F.; Cebrián, S.; Dafni, T.; Díez-Ibañez, D.; Ezquerro, A.; Ferrer-Ribas, E.; Galan, J.; Galindo, J.; García, J. A.; Giganon, A.; Goblin, C.; Irastorza, I. G.; Loiseau, C.; Luzón, G.; Navick, X. F.; Margalejo, C.; Mirallas, H.; Obis, L.; de Solórzano, A. Ortiz; Papaevangelou, T.; Pérez, O.; Quintana, A.; Ruz, J.; Vogel, J. K.
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Subject
Language
Abstract
In this paper we present measurements performed with a Micromegas X-ray detector setup. The detector is a prototype in the context of the BabyIAXO helioscope, which is under construction to search for an emission of the hypothetical axion particle from the sun. An important component of such a helioscope is a low background X-ray detector with a high efficiency in the 1-10 keV energy range. The goal of the measurement was to study techniques for background discrimination. In addition to common techniques we used a multi-layer veto system designed to tag cosmogenic neutron background. Over an effective time of 52 days, a background level of $8.6 \times 10^{-7}\,\text{counts keV}^{-1}\,\text{cm}^{-2} \, \text{s}^{-1}$ was reached in a laboratory at above ground level. This is the lowest background level achieved at surface level. In this paper we present the experimental setup, show simulations of the neutron-induced background, and demonstrate the process to identify background signals in the data. Finally, prospects to reach lower background levels down to $10^{-7} \, \text{counts keV}^{-1} \, \text{cm}^{-2} \, \text{s}^{-1}$ will be discussed.