PT Journal
AU NEXT Collaboration (Haefner, Jea
   Benlloch-Rodriguez, JM
   Carcel, S
   Carrion, JV
   Martin-Albo, J
   Martinez-Vara, M
   Muñoz Vidal, J
   Novella, P
   Querol, M
   Romo-Luque, C
   Sorel, M
   Uson, A
TI Reflectance and fluorescence characteristics of PTFE coated with TPB at visible, UV, and VUV as a function of thickness
SO Journal of Instrumentation
JI J. Instrum.
PY 2023
BP P03016 - 21pp
VL 18
IS 3
DI 10.1088/1748-0221/18/03/P03016
LA English
DE Materials for gaseous detectors; Particle tracking detectors (Gaseous detectors); Time projection chambers
AB 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.
ER