Measurements of Angle-Resolved Reflectivity of PTFE in Liquid Xenon with IBEX [article]

S. Kravitz, R.J. Smith, L. Hagaman, E.P. Bernard, D.N. McKinsey, L. Rudd, L. Tvrznikova, G.D. Orebi Gann, M. Sakai
2019 arXiv   pre-print
Liquid xenon particle detectors rely on excellent light collection efficiency for their performance. This depends on the high reflectivity of polytetrafluoroethylene (PTFE) at the xenon scintillation wavelength of 178 nm, but the angular dependence of this reflectivity is unknown. IBEX is designed to directly measure the angular distribution of xenon scintillation light reflected off PTFE in liquid xenon. These measurements are fully described by a microphysical reflectivity model with few free
more » ... parameters. Dependence on PTFE type, surface finish, xenon pressure, and wavelength of incident light is explored. Total internal reflection is observed, which results in the dominance of specular over diffuse reflection and a reflectivity near 100% for high angles of incidence.
arXiv:1909.08730v3 fatcat:oiuhbrwy7va27panhsro34q3wq