Bonn 2020 – wissenschaftliches Programm
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HK 61.4: Vortrag
Freitag, 3. April 2020, 12:00–12:15, J-HS L
Investigation of coating methods for radon background reduction in liquid xenon experiments — •Mona Piotter, Florian Jörg, Hardy Simgen, and Guillaume Eurin — Max-Planck-Institut für Kernphysik, Heidelberg
Several cosmological and astrophysical observations hint that a large fraction of the energy density of today’s universe is present in the form of non-luminous matter. One candidate for this so-called dark matter is the WIMP (weakly interacting massive particle). Liquid xenon detectors can be used to detect their rare interactions with baryonic matter for which a very low background is necessary. The biggest source of background in these experiments originates from radon. To reduce this background studies are carried out investigating the radon mitigation properties of surface coatings. The coating methods that are considered include: electrodeposition, physical vapor deposition (PVD), chemical vapor deposition (CVD) and epoxy coatings.
The coatings are done on thoriated tungsten welding rods containing 232Th which decays to 220Rn. Therefore these rods are useful because they are a strong enough radon source. Previous studies already showed that electrodeposition can offer a significant reduction in radon emanation. Now the different parameters of coating were systematically analyzed. Additionally studies on PVD and CVD are done especially of multilayer coatings and diamond like carbon coatings.
The results of these investigations will be discussed as part of the talk.