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. , Ortiz de Solórzano A. , Papaevangelou T. , Pérez O. , Quintana A. , Ruz J. , Vogel J. K. TITLE=Background discrimination with a Micromegas detector prototype and veto system for BabyIAXO JOURNAL=Frontiers in Physics VOLUME=12 YEAR=2024 URL=https://www.frontiersin.org/journals/physics/articles/10.3389/fphy.2024.1384415 DOI=10.3389/fphy.2024.1384415 ISSN=2296-424X 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 cosmic-ray induced neutron background. Over an effective time of 52 days, a background level of 8.6 × 10−7 counts keV−1 cm−2 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 counts keV−1 cm−2 s−1 are discussed.