Speakers
Flavio Cavanna
(Yale U.)Prof.
Roberto Francini
(Università degli Studi di Roma Tor Vergata)
Description
The use of efficient wavelength-shifters from the vacuum-ultraviolet to the photosensor’s
range of sensitivity is a key feature in detectors for Dark Matter search and Neutrino
physics based on liquid argon scintillation detection. Thin film of Tetraphenyl-butadiene (TPB)
deposited onto the surface delimiting the active volume of the detector and/or onto the photosensor
optical window is the most common solution in current and planned experiments. Detector design
and response can be evaluated and correctly simulated only when the properties of the optical
system in use (TPB film + substrate) are fully understood.
The main features of TPB coatings on different, commonly used substrates is reported,
Measured features include TPB emission spectra with lineshape and relative intensity
variation recorded as a function of the film thickness
and for the first time down to LAr temperature,
as well as optical reflectance and transmittance spectra of the TPB coated substrates in the
wavelength range of the TPB emission.
Primary authors
Dr
Enrico Nichelatti
(ENEA C.R. Casaccia)
Dr
Ettore Segreto
(Laboratori Nazionali del Gran Sasso)
Flavio Cavanna
(Yale U.)
Dr
Maria Aurora Vincenti
(ENEA C.R. Frascati)
Dr
Nicola Canci
(INFN - Laboratori Nazionali del Gran Sasso)
Prof.
Roberto Francini
(Università degli Studi di Roma Tor Vergata)
Dr
Rosa Maria Montereali
(ENEA C.R. Frascati)