Observation of radon mitigation in MicroBooNE by a liquid argon filtration system

Author:

Abratenko P.,Anthony J.,Arellano L.,Asaadi J.,Ashkenazi A.,Balasubramanian S.,Baller B.,Barnes C.,Barr G.,Barrow J.,Basque V.,Bathe-Peters L.,Benevides Rodrigues O.,Berkman S.,Bhanderi A.,Bhat A.,Bhattacharya M.,Bishai M.,Blake A.,Bolton T.,Book J.Y.,Camilleri L.,Caratelli D.,Caro Terrazas I.,Cavanna F.,Cerati G.,Chen Y.,Cianci D.,Conrad J.M.,Convery M.,Cooper-Troendle L.,Crespo-Anadón J.I.,Del Tutto M.,Dennis S.R.,Detje P.,Devitt A.,Diurba R.,Dorrill R.,Duffy K.,Dytman S.,Eberly B.,Ereditato A.,Evans J.J.,Fine R.,Fiorentini Aguirre G.A.,Fitzpatrick R.S.,Fleming B.T.,Foppiani N.,Franco D.,Furmanski A.P.,Garcia-Gamez D.,Gardiner S.,Ge G.,Gollapinni S.,Goodwin O.,Gramellini E.,Green P.,Greenlee H.,Gu W.,Guenette R.,Guzowski P.,Hagaman L.,Hen O.,Hilgenberg C.,Horton-Smith G.A.,Hourlier A.,Itay R.,James C.,Ji X.,Jiang L.,Jo J.H.,Joe C.,Johnson R.A.,Jwa Y.-J.,Kalra D.,Kamp N.,Kaneshige N.,Karagiorgi G.,Ketchum W.,Kirby M.,Kobilarcik T.,Kreslo I.,Lepetic I.,Li J.-Y.,Li K.,Li Y.,Lin K.,Littlejohn B.R.,Louis W.C.,Luo X.,Manivannan K.,Mariani C.,Marsden D.,Marshall J.,Martinez Caicedo D.A.,Mason K.,Mastbaum A.,McConkey N.,Meddage V.,Mettler T.,Miller K.,Mills J.,Mistry K.,Mogan A.,Mohayai T.,Mooney M.,Moor A.F.,Moore C.D.,Mora Lepin L.,Mousseau J.,Mulleriababu S.,Naples D.,Navrer-Agasson A.,Nayak N.,Nebot-Guinot M.,Neely R.K.,Newmark D.A.,Nowak J.,Nunes M.,Palamara O.,Paolone V.,Papadopoulou A.,Papavassiliou V.,Parkinson H.B.,Pate S.F.,Patel N.,Paudel A.,Pavlovic Z.,Piasetzky E.,Ponce-Pinto I.D.,Prince S.,Qian X.,Raaf J.L.,Radeka V.,Rafique A.,Reggiani-Guzzo M.,Ren L.,Rice L.C.J.,Rochester L.,Rodriguez Rondon J.,Rosenberg M.,Ross-Lonergan M.,Rudolf von Rohr C.,Scanavini G.,Schmitz D.W.,Schukraft A.,Seligman W.,Shaevitz M.H.,Sharankova R.,Shi J.,Sinclair J.,Smith A.,Snider E.L.,Soderberg M.,Söldner-Rembold S.,Spentzouris P.,Spitz J.,Stancari M.,St. John J.,Strauss T.,Sutton K.,Sword-Fehlberg S.,Szelc A.M.,Tang W.,Terao K.,Thorpe C.,Torbunov D.,Totani D.,Toups M.,Tsai Y.-T.,Uchida M.A.,Usher T.,Viren B.,Weber M.,Wei H.,White A.J.,Williams Z.,Wolbers S.,Wongjirad T.,Wospakrik M.,Wresilo K.,Wright N.,Wu W.,Yandel E.,Yang T.,Yarbrough G.,Yates L.E.,Yu H.W.,Zeller G.P.,Zennamo J.,Zhang C.,Zuckerbrot M.

Abstract

AbstractThe MicroBooNE liquid argon time projection chamber (LArTPC) maintains a high level of liquid argon purity through the use of a filtration system that removes electronegative contaminants in continuously-circulated liquid, recondensed boil off, and externally supplied argon gas. We use the MicroBooNE LArTPC to reconstruct MeV-scale radiological decays. Using this technique we measure the liquid argon filtration system's efficacy at removing radon. This is studied by placing a 500 kBq222Rn source upstream of the filters and searching for a time-dependent increase in the number of radiological decays in the LArTPC. In the context of two models for radon mitigation via a liquid argon filtration system, a slowing mechanism and a trapping mechanism, MicroBooNE data supports a radon reduction factor of greater than 97% or 99.999%, respectively. Furthermore, a radiological survey of the filters found that the copper-based filter material was the primary medium that removed the222Rn. This is the first observation of radon mitigation in liquid argon with a large-scale copper-based filter and could offer a radon mitigation solution for future large LArTPCs.

Publisher

IOP Publishing

Subject

Mathematical Physics,Instrumentation

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