Speakers
Dr
Ettore Segreto
(Laboratori Nazionali del Gran Sasso)Dr
Nicola Canci
(Laboratori Nazionali del Gran Sasso)
Description
Tetra Phenyl Butadiene (TPB) is the most commonly used compound to wave-shift the
128 nm scintillation light of liquid Argon down to the visible spectrum. We present a study on the loss of conversion efficiency of thin TPB films evaporated on reflective foils when exposed to light and atmosphere. The efficiency of the films is measured and monitored with a dedicated set-up that uses gaseous Argon excited by alpha particles to produce 128 nm photons and working at room temperature. In particular we performed a two years long exposure of the samples to lab diffuse light and atmosphere. We also performed more controlled aging tests to investigate the effect of storing samples in a inert atmosphere and how sample's thickness influences
degradation.
Primary authors
Dr
Andrzej Szelc
(Yale University)
Dr
Ettore Segreto
(Laboratori Nazionali del Gran Sasso)
Prof.
Flavio Cavanna
(Yale University)
Dr
Nicola Canci
(Laboratori Nazionali del Gran Sasso)
Dr
Roberto Acciarri
(FNAL)