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Reflectance and fluorescence characteristics of PTFE coated with TPB at visible, UV, and VUV as a function of thickness

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arxiv 2211.05024 v3 pith:UIC3BNBF submitted 2022-11-09 physics.ins-det hep-exphysics.optics

Reflectance and fluorescence characteristics of PTFE coated with TPB at visible, UV, and VUV as a function of thickness

J. Haefner , A. Fahs , J. Ho , C. Stanford , R. Guenette , C. Adams , H. Almaz\'an , V. \'Alvarez
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B. Aparicio A.I. Aranburu L. Arazi I.J. Arnquist F. Auria-Luna S. Ayet C.D.R. Azevedo K. Bailey F. Ballester J.M. Benlloch-Rodr\'iguez F.I.G.M. Borges S. Bounasser N. Byrnes S. C\'arcel J.V. Carri\'on S. Cebri\'an E. Church C.A.N. Conde T. Contreras F.P. Coss\'io A.A. Denisenko E. Dey G. D\'iaz T. Dickel J. Escada R. Esteve R. Felkai L.M.P. Fernandes P. Ferrario A.L. Ferreira F.W. Foss E.D.C. Freitas Z. Freixa J. Generowicz A. Goldschmidt J.J. G\'omez-Cadenas R. Gonz\'alez J. Grocott K. Hafidi J. Hauptman C.A.O. Henriques J.A. Hernando Morata P. Herrero-G\'omez V. Herrero P. Ho Y. Ifergan B.J.P. Jones M. Kekic L. Labarga L. Larizgoitia P. Lebrun D. Lopez Gutierrez N. L\'opez-March R. Madigan R.D.P. Mano J. Mart\'in-Albo G. Mart\'inez-Lema M. Mart\'inez-Vara A.P. Marques Z.E. Meziani R. Miller K. Mistry J. Molina-Canteras F. Monrabal C.M.B. Monteiro F.J. Mora J. Mu\~noz Vidal K. Navarro P. Novella A. Nu\~nez D.R. Nygren E. Oblak M. Odriozola-Gimeno B. Palmeiro A. Para M. Querol A.B. Redwine J. Renner I. Rivilla J. Rodr\'iguez C. Rogero L. Rogers B. Romeo C. Romo-Luque F.P. Santos J.M.F. dos Santos A. Sim\'on M. Sorel J.M.R. Teixeira J.F. Toledo J. Torrent A. Us\'on J.F.C.A. Veloso T.T. Vuong J. Waiton
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classification physics.ins-det hep-exphysics.optics
keywords lightptfecoatedresultsthicknessfunctionparticlephysics
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Polytetrafluoroethylene (PTFE) is an excellent diffuse reflector widely used in light collection systems for particle physics experiments. In noble element systems, it is often coated with tetraphenyl butadiene (TPB) to allow detection of vacuum ultraviolet scintillation light. In this work this dependence is investigated for PTFE coated with TPB in air for light of wavelengths of 200~nm, 260~nm, and 450~nm. The results show that TPB-coated PTFE has a reflectance of approximately 92\% for thicknesses ranging from 5~mm to 10~mm at 450~nm, with negligible variation as a function of thickness within this range. A cross-check of these results using an argon chamber supports the conclusion that the change in thickness from 5~mm to 10~mm does not affect significantly the light response at 128~nm. Our results indicate that pieces of TPB-coated PTFE thinner than the typical 10~mm can be used in particle physics detectors without compromising the light signal.

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  1. Detection of scintillation light in noble gases with wavelength-shifting optical fibers

    physics.ins-det 2026-07 accept novelty 5.0

    TPB-coated WLS fibers achieve LCE of 1.18% (Xe) and 1.07% (Ar) up to 8.5 bar with SiPM readout, confirmed by an independent PMT setup after PDE scaling.