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Electroluminescence pulse shape and electron diffusion in liquid argon measured in a dual-phase TPC

Authors: Pierfranco Demontis; Nicomede Pelliccia; A. Devoto; Ben Loer; A. Tonazzo; S. Davini; V. N. Muratova; +167 Authors

Electroluminescence pulse shape and electron diffusion in liquid argon measured in a dual-phase TPC

Abstract

We report the measurement of the longitudinal diffusion constant in liquid argon with the DarkSide-50 dual-phase time projection chamber. The measurement is performed at drift electric fields of 100 V/cm, 150 V/cm, and 200 V/cm using high statistics $^{39}$Ar decays from atmospheric argon. We derive an expression to describe the pulse shape of the electroluminescence signal (S2) in dual-phase TPCs. The derived S2 pulse shape is fit to events from the uppermost portion of the TPC in order to characterize the radial dependence of the signal. The results are provided as inputs to the measurement of the longitudinal diffusion constant DL, which we find to be (4.12 $\pm$ 0.04) cm$^2$/s for a selection of 140keV electron recoil events in 200V/cm drift field and 2.8kV/cm extraction field. To study the systematics of our measurement we examine datasets of varying event energy, field strength, and detector volume yielding a weighted average value for the diffusion constant of (4.09 $\pm$ 0.09) cm$^2$ /s. The measured longitudinal diffusion constant is observed to have an energy dependence, and within the studied energy range the result is systematically lower than other results in the literature.

Countries
Italy, Russian Federation, France, France, Poland, France, France, France, Russian Federation, France, France, France
Keywords

Electron diffusion constant; Liquid argon; Time projection chamber; TRANSPORT; XENON; AR-39, Physics - Instrumentation and Detectors, shape analysis, Electron diffusion constant; Liquid argon; Time projection chamber, XENON, electron: recoil, recoil [electron], Electron diffusion constant; Liquid argon; Time projection chamber;, [ PHYS.PHYS.PHYS-INS-DET ] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Instrumentation, electric field: field strength, diffusion, Instrumentation and Detectors (physics.ins-det), diffusion [electron], electron diffusion constant, electric field, AR-39, Time projection chamber, liquid argon [time projection chamber], statistics, argon, field strength [electric field], physics, electron: diffusion, Nuclear and High Energy Physics, longitudinal, FOS: Physical sciences, 530, energy dependence, statistical analysis, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Electron diffusion constant, elementary particle physics, time projection chamber: liquid argon, 541, TRANSPORT, Electron diffusion constant; Liquid argon; Time projection chamber; Nuclear and high energy physics; Instrumentation, liquid argon, time projection chamber, * Automatic Keywords *, field strength, [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], atmosphere, Liquid argon, Electron diffusion constant; Liquid argon; Time projection chamber; Nuclear and High Energy Physics; Instrumentation

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