Attenuation measurements of vacuum ultraviolet light in liquid argon revisited

Neumeier, A.; Dandl, T.; Himpsl, A.; Hofmann, M.; Oberauer, L.; Potzel, W.; Schönert, S.; Ulrich, A.

doi:10.1016/j.nima.2015.07.051

Cited by 16 publications

(18 citation statements)

References 17 publications

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“…Modelling the data by a short Rayleigh scattering length could not reproduce the data. On the other hand, a lower limit of 110 cm for the attenuation length of very pure (distilled) liquid argon to its own scintillation light was recently found by experiment [11]. The low value observed in our setup might be an indication for the presence of traces of impurities in the argon.…”

Section: Measured Light Yieldsupporting

confidence: 44%

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

Calvo

Cantini

Daniel

et al. 2018

Astroparticle Physics

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Abstract. 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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Section: Measured Light Yieldsupporting

confidence: 44%

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

Calvo

Cantini

Daniel

et al. 2018

Astroparticle Physics

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“…However, the decreasing trend of the measured transmission towards the short wavelength end of the experimental setup could be a hint towards beginning of Rayleigh scattering. A Rayleigh scattering length of 90 cm can presently neither be confirmed nor excluded conclusively at the moment [3]. Furthermore a second, wavelength-integrated measurement of the attenuation length of liquid argon is also shown for comparison (see the asterisk in the upper panel of Fig.…”

Section: Vuv-light Attenuation In Liquid Argon Revisitedmentioning

confidence: 91%

“…[1] and described in detail in ref. [3]. Briefly, the inner cell containing the liquid noble gas mixtures has an optical path length of 11.6 cm.…”

Section: Methodsmentioning

confidence: 99%

“…Although the concept for measuring the attenuation of light in a liquid noblegas sample is straightforward we identified various, partly surprising sources of systematic effects which influence the results. These effects are discussed in detail in a separate publication focused on technical aspects [3]. The systematic uncertainties from those effects are included in the analysis of the data presented below.…”

Section: Introductionmentioning

confidence: 99%

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Attenuation of vacuum ultraviolet light in pure and xenon-doped liquid argon —An approach to an assignment of the near-infrared emission from the mixture

Neumeier¹,

Dandl²,

Himpsl³

et al. 2015

EPL

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Results of transmission experiments of vacuum ultraviolet light through a 11.6 cm long cell filled with pure and xenon-doped liquid argon are described. Pure liquid argon shows no attenuation down to the experimental short-wavelength cut-off at 118 nm. Based on a conservative approach, a lower limit of 1.10 m for the attenuation length of its own scintillation light could be derived. Adding xenon to liquid argon at concentrations on the order of parts per million leads to strong xenon-related absorption features which are used for a tentative assignment of the recently found near-infrared emission observed in electron-beam excited liquid argon-xenon mixtures. Two of the three absorption features can be explained by perturbed xenon transitions and the third one by a trapped exciton (Wannier-Mott) impurity state. A calibration curve connecting the equivalent width of the absorption line at 140 nm with xenon concentration is provided. PACS. 29.40.Mc Scintillation detectors -33.20.Ni Vacuum ultraviolet spectra -61.25.Bi Liquid noble gases arXiv:1511.07725v1 [physics.ins-det]

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“…The probability that the photon is Rayleigh scattered along its path is given by P Rayleigh = B exp (−L/λ Rayleigh ), where B is a normalization constant, L is the track length to the intersection, and λ Rayleigh = 1.1 m [18] is the Rayleigh scattering length. There are many different values for λ Rayleigh found in the literature [19][20][21].…”

Section: Appendix C Simulation Of Cosmic Muon Tracks In Blanchementioning

confidence: 99%

A novel use of light guides and wavelength shifting plates for the detection of scintillation photons in large liquid argon detectors

Howard

Mufson

Whittington

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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Scintillation light generated as charged particles traverse large liquid argon detectors adds valuable information to studies of weakly-interacting particles. This paper uses both laboratory measurements and cosmic ray data from the Blanche dewar facility at Fermilab to characterize the efficiency of the photon detector technology developed at Indiana University for the single phase far detector of DUNE. The efficiency of this technology was found to be 0.48% at the readout end when the detector components were characterized with laboratory measurements. A second determination of the efficiency using cosmic ray tracks is in reasonable agreement with the laboratory determination. The agreement of these two efficiency determinations supports the result that minimum ionizing muons generate N phot = 40, 000 photons/MeV as they cross the LAr volume.

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Attenuation measurements of vacuum ultraviolet light in liquid argon revisited

Cited by 16 publications

References 17 publications

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

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

Attenuation of vacuum ultraviolet light in pure and xenon-doped liquid argon —An approach to an assignment of the near-infrared emission from the mixture

A novel use of light guides and wavelength shifting plates for the detection of scintillation photons in large liquid argon detectors

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