We describe here measurements with a new device, the "dichroicon," a Winston-style light concentrator built out of dichroic reflectors, which could allow large-scale neutrino detectors to sort photons by wavelength with small overall light loss. Photon sorting would benefit large-scale water or ice Cherenkov detectors such as Hyper-Kamiokande or ICECUBE by providing a measure of dispersion, which in turn could allow improved position reconstruction and timing. For scintillator detectors like JUNO, upgrades to SNO+ or KamLAND-ZEN, or to water-based liquid scintillator detectors like Theia, dichroicons would provide effective discrimination between Cherenkov and scintillation light, allowing them to operate as true hybrid detectors. Dichroicons are useful for wavelength discrimination in any photon-starved environment in which detection area is limited.We include measurements with a prototype dichroicon using first a Cherenkov source to show spectral photon sorting works as expected. We then present measurements of two different LAB-based liquid scintillator sources, and demonstrate discrimination between Cherenkov and scintillation light. On the benchtop we can identify Cherenkov light with better than 90% purity while maintaining a high collection efficiency for the scintillation light. First results from simulations of a large-scale detector are also presented.
MiniCLEAN is a single-phase liquid argon dark matter experiment. During the initial cooling phase, impurities within the cold gas (<140 K) were monitored by measuring the scintillation light triplet lifetime, and ultimately a triplet lifetime of 3.480 ± 0.001 (stat.) ± 0.064 (sys.) µs was obtained, indicating ultra-pure argon. This is the longest argon triplet time constant ever reported. The effect of quenching of separate components of the scintillation light is also investigated.PACS. PACS-key discribing text of that key -PACS-key discribing text of that key a Corresponding author : wangbtc@brandeis.edu ranges from 104 nm to 110 nm, the second continuum peaks at 128 nm and the third continuum ranges from 180 nm to 230 nm.
Eos is a technology demonstrator, designed to
explore the capabilities of hybrid event detection technology,
leveraging both Cherenkov and scintillation light simultaneously.
With a fiducial mass of four tons, Eos is designed to
operate in a high-precision regime, with sufficient size to utilize
time-of-flight information for full event reconstruction,
flexibility to demonstrate a range of cutting edge technologies, and
simplicity of design to facilitate potential future deployment at
alternative sites. Results from Eos can inform the design
of future neutrino detectors for both fundamental physics and
nonproliferation applications. This paper describes the conceptual
design and potential applications of the Eos detector.
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