An estimation of photon scattering length in tetraphenyl-butadiene

Stolp, D.; Dalager, Olivia; Dhaliwal, Navneet; Godfrey, Benjamin; Irving, Michael; Kazkaz, K.; Manalaysay, A.; Neher, Christian; Stephenson, S.; Tripathi, M.

doi:10.1088/1748-0221/11/03/c03025

Cited by 9 publications

(20 citation statements)

References 2 publications

(2 reference statements)

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“…Microcrystaline structure of TPB coatings leads to the significant scattering of visible light. The mean scattering length for a vacuum evaporated coating was measured to be in the range 2-3 µm [51].…”

Section: Tpbmentioning

confidence: 99%

Wavelength Shifters for Applications in Liquid Argon Detectors

Kuźniak

Szelc

2020

Instruments

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Wavelength shifters and their applications for liquid argon detectors have been a subject of extensive R&D procedures over the past decade. This work reviews the most recent results in this field. We compare the optical properties and usage details together with the associated challenges for various wavelength shifting solutions. We discuss the current status and potential future R&D directions for the main classes of wavelength shifters.

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Section: Tpbmentioning

confidence: 99%

Wavelength Shifters for Applications in Liquid Argon Detectors

Kuźniak

Szelc

2020

Instruments

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“…Although very little change of conversion efficiency with coating thickness is expected, increased visible light scattering expected from a thicker coating could result in asymmetries in visible light propagation across the detector. It was required for the thickness variation to be smaller than the scattering length in TPB, which was assumed to be 1 µm; the scattering length in TPB is weakly constrained with only one published measurement of 2-3 µm [9], published recently.…”

Section: Coating Requirementsmentioning

confidence: 99%

Application of the TPB Wavelength Shifter to the DEAP-3600 Spherical Acrylic Vessel Inner Surface

et al. 2017

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DEAP-3600 uses liquid argon contained in a spherical acrylic vessel as a target medium to perform a sensitive spin-independent dark matter search. Argon scintillates in the vacuum ultraviolet spectrum, which requires wavelength shifting to convert the VUV photons to visible so they can be transmitted through the acrylic light guides and detected by the surrounding photomultiplier tubes. The wavelength shifter 1,1,4,4-tetraphenyl-1,3-butadiene was evaporatively deposited to the inner surface of the acrylic vessel under vacuum. Two evaporations were performed on the DEAP-3600 acrylic vessel with an estimated coating thickness of 3.00 ± 0.02 µm which is successfully wavelength shifting with liquid argon in the detector. Details on the wavelength shifter coating requirements, deposition source, testing, and final performance are presented.

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“…One commonly used WLS is tetraphenyl butadiene (TPB). TPB thin films have been widely studied [16][17][18][19][20][21][22][23][24][25][26] and are regularly used for many experimental programs [2][3][4][5][6][7][8][9] due to their relatively high efficiency. TPB may also be easily applied to surfaces using standard techniques, such as vacuum deposition in a thermal evaporator.…”

Section: Introductionmentioning

confidence: 99%

Measurements of the intrinsic quantum efficiency and absorption length of tetraphenyl butadiene thin films in the vacuum ultraviolet regime

2018

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A key enabling technology for many liquid noble gas (LNG) detectors is the use of the common wavelength shifting medium tetraphenyl butadiene (TPB). TPB thin films are used to shift ultraviolet scintillation light into the visible spectrum for detection and event reconstruction. Understanding the wavelength shifting efficiency and optical properties of these films are critical aspects in detector performance and modeling and hence in the ultimate physics sensitivity of such experiments. This article presents the first measurements of the room-temperature microphysical quantum efficiency for vacuum-deposited TPB thin films -a result that is independent of the optics of the TPB or substrate. Also presented are measurements of the absorption length in the vacuum ultraviolet regime, the secondary re-emission efficiency, and more precise results for the "black-box" efficiency across a broader spectrum of wavelengths than previous results. The low-wavelength sensitivity, in particular, would allow construction of LNG scintillator detectors with lighter elements (Ne, He) to target light mass WIMPs.

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An estimation of photon scattering length in tetraphenyl-butadiene

Cited by 9 publications

References 2 publications

Wavelength Shifters for Applications in Liquid Argon Detectors

Wavelength Shifters for Applications in Liquid Argon Detectors

Application of the TPB Wavelength Shifter to the DEAP-3600 Spherical Acrylic Vessel Inner Surface

Measurements of the intrinsic quantum efficiency and absorption length of tetraphenyl butadiene thin films in the vacuum ultraviolet regime

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