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Title: An estimation of photon scattering length in tetraphenyl-butadiene

Tetraphenyl-butadiene (TPB) is a wavelength shifting material that can absorb ultraviolet photons and emit blue photons. It is used in the detection of vacuum ultraviolet (VUV) photons, for which typical photo-sensors, such as most photomultiplier tubes (PMT) and silicon photomultipliers (SiPM), do not have any quantum efficiency. The secondary blue light is emitted isotropically, however, due to scattering within the material, its angular distribution upon exiting the material can not be easily predicted. In this work, we describe a procedure for estimating the scattering length of blue light in TPB, by measuring and modeling the angular distribution as a function of layer thickness. The experiment consists of shining 254nm light at various thicknesses of TPB deposited on fused silica, and measuring the intensity of blue light using SiPMs on either side of the sample. We simulate light propagation within the sample to estimate the light yield and compare that to the data, which allows us to estimate mean scattering length for photons in TPB to be in the range 2–3 µm, with some preference for a central value of 2.75 µm.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Univ. of California, Davis, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-736701
Journal ID: ISSN 1748-0221
Grant/Contract Number:
NA0000979; FG02-91ER40674; AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 11; Journal Issue: 03; Conference: Light Detection in Noble Elements (LIDINE2015), Albany, NY (United States), 28-30 Aug 2015; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Research Org:
Univ. of California, Davis, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA). Nuclear Science and Security Consortium (NSSC); USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Photoemission; Optical detector readout concepts; Noble liquid detectors (scintillation, ionization, double-phase); Dark Matter detectors (WIMPs, axions, etc.); Astronomy and AstroPhysics, Optics and optical instruments, Physics - Physics of elementary particles and fields
OSTI Identifier:
1454590
Alternate Identifier(s):
OSTI ID: 1458638

Stolp, D., Dalager, O., Dhaliwal, N., Godfrey, B., Irving, M., Kazkaz, K., Manalaysay, A., Neher, C., Stephenson, S., and Tripathi, M.. An estimation of photon scattering length in tetraphenyl-butadiene. United States: N. p., Web. doi:10.1088/1748-0221/11/03/C03025.
Stolp, D., Dalager, O., Dhaliwal, N., Godfrey, B., Irving, M., Kazkaz, K., Manalaysay, A., Neher, C., Stephenson, S., & Tripathi, M.. An estimation of photon scattering length in tetraphenyl-butadiene. United States. doi:10.1088/1748-0221/11/03/C03025.
Stolp, D., Dalager, O., Dhaliwal, N., Godfrey, B., Irving, M., Kazkaz, K., Manalaysay, A., Neher, C., Stephenson, S., and Tripathi, M.. 2016. "An estimation of photon scattering length in tetraphenyl-butadiene". United States. doi:10.1088/1748-0221/11/03/C03025. https://www.osti.gov/servlets/purl/1454590.
@article{osti_1454590,
title = {An estimation of photon scattering length in tetraphenyl-butadiene},
author = {Stolp, D. and Dalager, O. and Dhaliwal, N. and Godfrey, B. and Irving, M. and Kazkaz, K. and Manalaysay, A. and Neher, C. and Stephenson, S. and Tripathi, M.},
abstractNote = {Tetraphenyl-butadiene (TPB) is a wavelength shifting material that can absorb ultraviolet photons and emit blue photons. It is used in the detection of vacuum ultraviolet (VUV) photons, for which typical photo-sensors, such as most photomultiplier tubes (PMT) and silicon photomultipliers (SiPM), do not have any quantum efficiency. The secondary blue light is emitted isotropically, however, due to scattering within the material, its angular distribution upon exiting the material can not be easily predicted. In this work, we describe a procedure for estimating the scattering length of blue light in TPB, by measuring and modeling the angular distribution as a function of layer thickness. The experiment consists of shining 254nm light at various thicknesses of TPB deposited on fused silica, and measuring the intensity of blue light using SiPMs on either side of the sample. We simulate light propagation within the sample to estimate the light yield and compare that to the data, which allows us to estimate mean scattering length for photons in TPB to be in the range 2–3 µm, with some preference for a central value of 2.75 µm.},
doi = {10.1088/1748-0221/11/03/C03025},
journal = {Journal of Instrumentation},
number = 03,
volume = 11,
place = {United States},
year = {2016},
month = {3}
}