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 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 0.04) cm/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 0.09) cm /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.
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Cite
@article{arxiv.1802.01427,
title = {Electroluminescence pulse shape and electron diffusion in liquid argon measured in a dual-phase TPC},
author = {P. Agnes and I. F. M. Albuquerque and T. Alexander and A. K. Alton and D. M. Asner and M. P. Ave and H. O. Back and B. Baldin and G. Batignani and K. Biery and V. Bocci and G. Bonfini and W. Bonivento and M. Bossa and B. Bottino and F. Budano and S. Bussino and M. Cadeddu and M. Cadoni and F. Calaprice and A. Caminata and N. Canci and A. Candela and M. Caravati and M. Cariello and M. Carlini and M. Carpinelli and S. Catalanotti and V. Cataudella and P. Cavalcante and S. Cavuoti and A. Chepurnov and C. Cicalo and A. G. Cocco and G. Covone and D. D'Angelo and M. D'Incecco and D. D'Urso and S. Davini and A. De Candia and S. De Cecco and M. De Deo and G. De Filippis and G. De Rosa and M. De Vincenzi and P. Demontis and A. V. Derbin and A. Devoto and F. Di Eusanio and G. Di Pietro and C. Dionisi and E. Edkins and A. Fan and G. Fiorillo and K. Fomenko and D. Franco and F. Gabriele and A. Gabrieli and C. Galbiati and S. Giagu and C. Giganti and G. K. Giovanetti and A. M. Goretti and F. Granato and M. Gromov and M. Guan and Y. Guardinbcerri and M. Gulino and B. R. Hackett and K. Herner and D. Hughes and P. Humble and E. V. Hungerford and An. Ianni and I. James and T. N. Johnson and K. Keeter and C. L. Kendziora and G. Koh and D. Korablev and G. Korga and A. Kubankin and M. Kuss and X. Li and M. Lissia and B. Loer and G. Longo and Y. Ma and A. A. Machado and I. N. Machulin and A. Mandarano and S. M. Mari and J. Maricic and C. J. Martoff and A. Messina and P. D. Meyers and R. Milincic and A. Monte and M. Morrocchi and B. J. Mount and V. N. Muratova and P. Musico and A. Navrer Agasson and A. Nozdrina and A. Oleinik and M. Orsini and F. Ortica and L. Pagani and M. Pallavicini and L. Pandola and E. Pantic and E. Paoloni and F. Pazzona and K. Pelczar and N. Pelliccia and A. Pocar and S. Pordes and H. Qian and M. Razeti and A. Razeto and B. Reinhold and A. L. Renshaw and M. Rescigno and Q. Riffard and A. Romani and B. Rossi and N. Rossi and D. Sablone and O. Samoylov and W. Sands and S. Sanfilippo and M. Sant and C. Savarese and B. Schlitzer and E. Segreto and D. A. Semenov and A. Sheshukov and P. N. Singh and M. D. Skorokhvatov and O. Smirnov and A. Sotnikov and C. Stanford and G. B. Suffritti and Y. Suvorov and R. Tartaglia and G. Testera and A. Tonazzo and P. Trinchese and E. V. Unzhakov and M. Verducci and A. Vishneva and B. Vogelaar and M. Wada and T. J. Waldrop and S. Walker and H. Wang and Y. Wang and A. W. Watson and S. Westerdale and M. M. Wojcik and X. Xiang and X. Xiao and C. Yang and Z. Ye and C. Zhu and G. Zuzel},
journal= {arXiv preprint arXiv:1802.01427},
year = {2018}
}