arXiv subjects

Josh Klein

Publications and source records attributed to Josh Klein.

3 recordsLinked to original sources

arXiv2025

Dichroic Filter Characterizations

We present here measurements and characterizations of several dichroic filters, which are being used more commonly in nuclear and particle physics for photon-detection. The measurements were performed on filters immersed in several media: air, water, and LAB-based liquid scintillator. Measurements of transmission and reflection properties were made at various angles of incidence, and the data presented here can be used to develop detailed optical models for detector simulations. We find a modified Bragg's Law is a good model for the shift in transmission edge as a function of angle of incidence, across the various media.

hep-ex↗

arXiv2019

Spectral Photon Sorting For Large-Scale Cherenkov and Scintillation Detectors

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. 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.

physics.ins-det↗

arXiv2018

Cherenkov and Scintillation Light Separation Using Wavelength in LAB Based Liquid Scintillator

Linear alkyl benzene (LAB) has in recent years been used as a solvent for PPO in large-scale scintillation detectors, like Daya Bay and SNO+. The combination has several nice properties, including high light yield, good materials compatibility, and excellent pulse shape discrimination. As charged particles move through the LAB+PPO, both Cherenkov and scintillation light are created. Separating Cherenkov from scintillation light would allow a broad range of physics in future large-scale detectors like THEIA, by allowing direction reconstruction with Cherenkov light while retaining the high light yield and good particle ID of a scintillator detector. In this paper, we examine the discrimination of Cherenkov and scintillation light using a set of bandpass and dichroic filters. In principle, Cherenkov light emission extends longer in wavelength than the PPO scintillation spectrum, allowing for exclusive identification. We find that by selecting wavelengths above 450 nm the Cherenkov light can be clearly separated from the scintillation light.

physics.ins-det↗