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Investigation of surface cleaning procedures for the removal of radon daughters from PTFE surfaces and their applicability in liquid xenon detectors.

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Herrero Gómez,  Pablo
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Citation

Herrero Gómez, P. (2018). Investigation of surface cleaning procedures for the removal of radon daughters from PTFE surfaces and their applicability in liquid xenon detectors. Master Thesis, Ruprecht-Karls-Universität, Heidelberg.


Cite as: http://hdl.handle.net/21.11116/0000-0002-6DFA-B
Abstract
Background identification and suppression is of paramount importance for experiments seeking extremely rare events. Direct dark matter searches such as the XENON1T experiment fall in this category. 222Rn daughters are the dominant contribution to the internal background of the XENON1T detector. Air contains traces of radon which plates out its progeny onto the surface of the detector materials, such as the PTFE. This polymer is in direct contact with the sensitive liquid xenon as it is used to house the detector's dual-phase time projection chamber. The effects of surface cleaning procedures to remove surface sources from PTFE are investigated in this work. With a dedicated experimental setup, we investigate the efficiency of standard surface treatments and their applicability for XENON1T and the future upgrade XENONnT.