Measurement of the angular distribution of wavelength-shifted light emitted by TPB

Schrott, Jackson; Sakai, M.; Naugle, Samuel; Gann, Gabriel Orebi; Kravitz, S.; McKinsey, D. N.; Smith, R.

doi:10.1088/1748-0221/16/12/p12013

Cited by 2 publications

(1 citation statement)

References 45 publications

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“…Several R&D campaigns were performed by different groups to study and characterize one or more properties of the coated materials to validate or improve the features of the used methods with the aim to find the most appropriate technique able to guarantee stability and robustness of the coatings. Different systems and set-ups were built and operated to these proper tasks and analyses were carried out to extrapolate results on the features of the coated materials7 [7,19,23,28,33,[36][37][38][39][40][41][42][43][44].…”

Section: Wls Vacuum Deposition Processmentioning

confidence: 99%

Instruments and methods for coating of wavelength-shifting materials used for noble liquid technology

Canci

2024

J. Inst.

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The use of wavelength-shifting coatings is of primary interest in the area of liquified noble gases detectors. Argon and xenon are used as active medium in the neutrino physics and dark matter experiments, because charged particles crossing the noble liquid volume produce excitation and ionization followed by recombination and both the processes lead to the emission of VUV light. Noble liquid scintillation light emitted in the VUV range needs to be converted to be detected by conventional photosensors. Wavelength-shifting materials, such as TetraPhenyl-Butadiene and p-TerPhenyl, are used for this conversion to the visible range. The wavelength-shifters are particularly important in the case of large area detectors since only a fraction of the surface can be instrumented. To this purpose dedicated set-ups have been built and specific techniques have been adopted to produce and characterize very uniform wavelength-shifting coatings on highly reflecting material substrates, optical filters and optical guides. Some type of the facilities used to this task, with particular attention to the vacuum deposition systems, will be described, operations for production of the coatings will be reported, methods for the characterization of the samples will be briefly presented.

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Section: Wls Vacuum Deposition Processmentioning

confidence: 99%

Instruments and methods for coating of wavelength-shifting materials used for noble liquid technology

Canci

2024

J. Inst.

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Study of dielectric breakdown in liquid xenon with XeBrA: The xenon breakdown apparatus

Watson

Olcina

Soria

et al. 2023

Review of Scientific Instruments

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Maintaining the electric fields necessary for the current generation of noble liquid time projection chambers (TPCs), with drift lengths exceeding 1 m, requires a large negative voltage applied to their cathode. Delivering such high voltage is associated with an elevated risk of electrostatic discharge and electroluminescence, which would be detrimental to the performance of the experiment. The Xenon Breakdown Apparatus (XeBrA) is a 5-l, high voltage test chamber built to investigate the contributing factors to electrical breakdown in noble liquids. In this work, we present the main findings after conducting scans over stressed electrode areas, surface finish, pressure, and high voltage ramp speed in the medium of liquid xenon. Area scaling and surface finish were observed to be the dominant factors affecting breakdown, whereas no significant changes were observed with varying pressure or ramp speed. A general rise in both the anode current and photon rate was observed in the last 30 s, leading up to a breakdown, with a marked increase in the last couple of seconds. In addition, the position of breakdowns was reconstructed with a system of high-speed cameras and a moderate correlation with the Fowler–Nordheim field emission model was found. Tentative evidence for bubble nucleation being the originating mechanism of breakdown in the liquid was also observed. We deem the results presented in this work to be of particular interest for the design of future, large TPCs, and practical recommendations are provided.

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Measurement of the angular distribution of wavelength-shifted light emitted by TPB

Cited by 2 publications

References 45 publications

Instruments and methods for coating of wavelength-shifting materials used for noble liquid technology

Instruments and methods for coating of wavelength-shifting materials used for noble liquid technology

Study of dielectric breakdown in liquid xenon with XeBrA: The xenon breakdown apparatus

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