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Measurement of the attenuation length of argon scintillation light in the ArDM LAr TPC

by Daniel, M , Gendotti, A , Montes, B , Calvo, J , DiLuise, S , Periale, L , Natterer, G , Cantini, C , Radics, B , S Wu , Molina-Bueno, L , Romero, L , Sergiampietri, F , Santorelli, R , Viant, T , Crivelli, P , Regenfus, C , Ngyuen, K , Rubbia, A , Horikawa, S , W Mu , Collaboration, ArDM , Murphy, S , Quan, Y

in Argon / Attenuation / Chemical industry / Dark matter / Optical activity / Ray tracing / Scintillation

2016

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Measurement of the attenuation length of argon scintillation light in the ArDM LAr TPC

in Argon / Attenuation / Chemical industry / Dark matter / Optical activity / Ray tracing / Scintillation

2016

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Measurement of the attenuation length of argon scintillation light in the ArDM LAr TPC

in Argon / Attenuation / Chemical industry / Dark matter / Optical activity / Ray tracing / Scintillation

2016

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Paper

Measurement of the attenuation length of argon scintillation light in the ArDM LAr TPC

Daniel, M,

Gendotti, A,

Montes, B,

Calvo, J,

DiLuise, S,

Periale, L,

Natterer, G,

Cantini, C,

Radics, B,

S Wu,

Molina-Bueno, L,

Romero, L,

Sergiampietri, F,

Santorelli, R,

Viant, T,

Crivelli, P,

Regenfus, C,

Ngyuen, K,

Rubbia, A,

Horikawa, S,

W Mu,

Collaboration, ArDM,

Murphy, S,

Quan, Y

2016

Overview

We report on a measurement of the attenuation length for the scintillation light in the tonne size liquid argon target of the ArDM dark matter experiment. The data was recorded in the first underground operation of the experiment in single-phase operational mode. The results were achieved by comparing the light yield spectra from 39-Ar and 83m-Kr to a description of the ArDM setup with a model of full light ray tracing. A relatively low value close to 0.5 m was found for the attenuation length of the liquid argon bulk to its own scintillation light. We interpret this result as a presence of optically active impurities in the liquid argon which are not filtered by the installed purification systems. We also present analyses of the argon gas employed for the filling and discuss cross sections in the vacuum ultraviolet of various molecules in respect to purity requirements in the context of large liquid argon installations.

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Cornell University Library, arXiv.org

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