Background discrimination with a Micromegas detector prototype and veto system for BabyIAXO
Frontiers in Physics(2024)
摘要
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 ×
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 will be discussed.
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关键词
axions,rare event search,TPC (time projection chamber),background discrimination,x-ray detector,ultra low background
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