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Title: Helium–Xenon mixtures to improve the topological signature in high pressure gas xenon TPCs

Journal Article · · Nucl.Instrum.Meth.

Within the framework of xenon-based double beta decay experiments, we propose the possibility to improve the background rejection of an electroluminescent Time Projection Chamber (EL TPC) by reducing the diffusion of the drifting electrons while keeping nearly intact the energy resolution of a pure xenon EL TPC. Based on state-of-the-art microscopic simulations, a substantial addition of helium, around 10 or 15 %, may reduce drastically the transverse diffusion down to 2.5 mm/ m from the 10.5 mm/ m of pure xenon. The longitudinal diffusion remains around 4 mm/ m . Light production studies have been performed as well. They show that the relative variation in energy resolution introduced by such a change does not exceed a few percent, which leaves the energy resolution practically unchanged. The technical caveats of using photomultipliers close to an helium atmosphere are also discussed in detail.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
DOE Contract Number:
AC02-07CH11359
OSTI ID:
1508353
Report Number(s):
arXiv:1710.05600; FERMILAB-PUB-17-688-CD-ND; 1630900
Journal Information:
Nucl.Instrum.Meth., Vol. A905
Country of Publication:
United States
Language:
English

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Cited By (4)

High Pressure Gas Xenon TPCs for Double Beta Decay Searches journal April 2019
Electron drift and longitudinal diffusion in high pressure xenon-helium gas mixtures journal August 2019
Electron Drift and Longitudinal Diffusion in High Pressure Xenon-Helium Gas Mixtures text January 2019
High Pressure Gas Xenon TPCs for Double Beta Decay Searches preprint January 2019

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