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Investigation of coating-based radon barriers and studies towards their applicability in liquid xenon detectors

By F. Jörg

Abstract

For current and future experiments searching for rare events, background control and reduction are of crucial concern. Liquid xenon detectors searching for dark matter such as XENON1T are among these detectors. One of the largest contributions to its background is due to 222Rn emanated from detector materials. Radon mitigating properties of surface coatings applied by plasma deposition, sputtering and electrodeposition were investigated in this work. The most promising result was achieved by the application of an electrodeposited copper coating, which reduced the 220Rn emanation rate by two orders of magnitude. In this case the 222Rn emanation rate also showed a significant reduction. The impact and stability of the coating layers under operating conditions in a liquid xenon dual phase TPC will be tested in the Heidelberg Xenon system. In preparation for this, data analysis for a first successful calibration of the detector in single-phase mode using a 83mKr source, are presented

Publisher: Ruprecht-Karls-Universität
Year: 2017
OAI identifier: oai:pure.mpg.de:item_3000147
Provided by: MPG.PuRe
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