Development and characterization of a slow wavelength shifting coating for background rejection in liquid argon detectors

Gallacher, D.; Leonhardt, A.; Benmansour, H.; Ellingwood, E.; Hars, Q.; Kuźniak, M.; Anstey, James; Bondzior, Bartosz; Boulay, M. G.; Cai, B.; Dereń, P.J.; Stefano, P. C. F. Di; Garg, Sakshi; Mason, James Paul; Pollmann, T. R.; Skensved, P.; Strickland, V.; Stringer, M.

doi:10.1016/j.nima.2022.166683

Cited by 4 publications

(8 citation statements)

References 29 publications

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“…The light then goes through the acrylic substrate, which cuts off any remaining UV component. The optical ordering of UV light, pyrene-doped coating, acrylic, light detection, is similar to that of an argon particle detector like DEAP, made of acrylic, with the inner surface coated with pyrene-doped polystyrene and the light detectors on the other side [12].…”

Section: Time-resolved Modementioning

confidence: 94%

“…A standard WLS is 1,1,4,4-tetraphenyl-1,3-butadiene (TPB), characterized by a short, ∼ ns, time constant [10], and high conversion efficiency [11]. In certain cases, for instance to identify different regions of the detector [12], it may be advantageous for the WLS to have significantly longer time constants than TPB and argon, enabling a form of spatial pulse-shape discrimination. A similar approach can also be used in liquid scintillator detectors for separation of Cherenkov and scintillation components [13] or other purposes [14].…”

Section: Jinst 16 P12029mentioning

confidence: 99%

“…In the context of the DEAP experiment, a slow wavelength shifter can help mitigate the main source of background [12]. This work investigates the fluorescence light yield and decay profiles of four pyrene-doped polystyrene (PS) coatings with diverse pyrene purities and concentrations, excited by a 285 nm LED at temperatures between 4 K and 300 K, including the 87 K boiling point of liquid argon.…”

Section: Jinst 16 P12029mentioning

confidence: 99%

“…The samples used in this study were made at Carleton University and consist of a pyrene polystyrene mix applied as a film on Reynolds Polymer Technology (RPT) acrylic substrates that were machined to fit in the optical cryostat as shown in figure 2. Details of pyrene coating preparation can be found elsewhere [12]. Information on the RPT acrylic can be found in [24].…”

Section: Samplesmentioning

confidence: 99%

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Fluorescence of pyrene-doped polystyrene films from room temperature down to 4 K for wavelength-shifting applications

Benmansour¹,

Ellingwood²,

Hars³

et al. 2021

J. Inst.

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In liquid argon-based particle detectors, slow wavelength shifters (WLSs) could be used alongside the common, nanosecond scale, WLS tetraphenyl butadiene (TPB) for background mitigation purposes. At room temperature, pyrene has a moderate fluorescence light yield (LY) and a time constant of the order of hundreds of nanoseconds. In this work, four pyrene-doped polystyrene films with various purities and concentrations were characterized in terms of LY and decay time constants in a range of temperature between 4 K and 300 K under ultraviolet excitation. These films were found to have a LY between 35 and 50% of that of evaporated TPB. All light yields increase when cooling down, while the decays slow down. At room temperature, we observed that pyrene purity is strongly correlated with emission lifetime: highest obtainable purity samples were dominated by decays with emission time constants of ∼ 250–280 ns, and lower purity samples were dominated by an ∼ 80 ns component. One sample was investigated further to better understand the monomer and excimer emissions of pyrene. The excimer-over-monomer intensity ratio decreases when the temperature goes down, with the monomer emission dominating below ∼ 87 K.

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Section: Time-resolved Modementioning

confidence: 94%

Section: Jinst 16 P12029mentioning

confidence: 99%

Section: Jinst 16 P12029mentioning

confidence: 99%

Section: Samplesmentioning

confidence: 99%

See 2 more Smart Citations

Fluorescence of pyrene-doped polystyrene films from room temperature down to 4 K for wavelength-shifting applications

Benmansour¹,

Ellingwood²,

Hars³

et al. 2021

J. Inst.

View full text Add to dashboard Cite

show abstract

“…Such a slow decay time allows for applying a powerful pulse shape discrimination of the neck 𝛼s produced on the flowguides compared to the nuclear recoil events produced in the liquid argon itself. In addition, the internal cooling system will be replaced with an external one to prevent argon condensation on the flowguides [7]. An additional background that can be reconstructed in the WIMP ROI is the decay of 𝛼s embedded in particulate dust in the liquid argon, which results in a degraded and isotropic scintillation signal.…”

Section: Background Rejectionmentioning

confidence: 99%

Recent results from DEAP-3600

Lai

2023

Preprint

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A: DEAP-3600 is the largest running dark matter detector filled with liquid argon, set at SNOLAB, in Sudbury, Canada, 2 km underground. The experiment holds the most stringent exclusion limit in argon for WIMPs above 20 GeV/c 2 . In the most recent published analysis, the background events due to alpha-induced scintillation in the neck of the detector limited the sensitivity. The sensitivity of the detector in the next WIMP search will be improved thanks to the decrease in backgrounds achieved by hardware upgrades and applying multivariate analyses. Moreover, the WIMP analysis has been revisited in terms of a non-relativistic effective field theory framework, and the impact of possible substructures in the galactic dark matter halo was explored. This analysis was motivated by the latest results from Gaia and the Sloan Sky Digital Survey. Here DEAP-3600 set the world's best exclusion limit for xenon-phobic dark matter scenarios. Finally, a custom-developed analysis has recently pointed out the extraordinary sensitivity to ultraheavy, multi-scattering dark matter candidates, resulting in world-leading exclusion limits on two composite dark matter candidates up to Planck scale masses. These proceedings, after a quick overview of the dark matter detection in DEAP-3600, outline the detector upgrades and the dark matter search results from the collaboration of the last three years.

show abstract

Recent results from DEAP-3600

Laí

2023

J. Inst.

View full text Add to dashboard Cite

DEAP-3600 is the largest running dark matter detector filled with liquid argon, set at SNOLAB, in Sudbury, Canada, 2 km underground. The experiment holds the most stringent exclusion limit in argon for WIMPs above 20 GeV/c2. In the most recent published analysis, the background events due to α-induced scintillation in the neck of the detector limited the sensitivity. The sensitivity of the detector in the next WIMP search will be improved thanks to the decrease in backgrounds achieved by hardware upgrades and applying multivariate analyses. Moreover, the WIMP analysis has been revisited in terms of a non-relativistic effective field theory framework, and the impact of possible substructures in the galactic dark matter halo was explored. This analysis was motivated by the latest results from Gaia and the Sloan Sky Digital Survey. Here DEAP-3600 set the world’s best exclusion limit for xenon-phobic dark matter scenarios. Finally, a custom-developed analysis has recently pointed out the extraordinary sensitivity to ultra-heavy, multi-scattering dark matter candidates, resulting in world-leading exclusion limits on two composite dark matter candidates up to Planck scale masses. These proceedings, after a quick overview of the dark matter detection in DEAP-3600, outline the detector upgrades and the dark matter search results from the collaboration of the last three years.

show abstract

Development and characterization of a slow wavelength shifting coating for background rejection in liquid argon detectors

Cited by 4 publications

References 29 publications

Fluorescence of pyrene-doped polystyrene films from room temperature down to 4 K for wavelength-shifting applications

Fluorescence of pyrene-doped polystyrene films from room temperature down to 4 K for wavelength-shifting applications

Recent results from DEAP-3600

Recent results from DEAP-3600

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