Emanation and bulk fluorescence in liquid argon from tetraphenyl butadiene wavelength shifting coatings
We study the stability of three types of popularly employed TPB coatings under immersion in liquid argon. TPB emanation from each coating is quantified by fluorescence assay of molecular sieve filter material after a prolonged soak time. Two of the coatings are shown to emanate a detectable concentration of TPB into argon over a 24 hour period, which corresponds to tens of parts per billion in argon by mass. In an independent setup, the dissolved or suspended TPB is shown to produce a wavelength shifting effect in the argon bulk. Interpretations of these results and implications for present and future liquid argon time projection chamber experiments are discussed.
Journal of Instrumentation
- Pub Date:
- February 2019
- Physics - Instrumentation and Detectors
- v1: Initial submit v2: Typo fixes before journal submission v3: Accepted for publication in JINST