Benchmarking TPB-coated Light Guides for Liquid Argon TPC Light Detection Systems

摘要

Scintillation light from liquid argon is produced at 128 nm and thus must beshifted to visible wavelengths in light detection systems used for Liquid ArgonTime Projection Chambers (LArTPCs). To date, designs have employed tetraphenylbutadiene (TPB) coatings on photomultiplier tubes (PMTs) or plates placed infront of the PMTs. Recently, a new approach using TPB-coated light guides wasproposed. In this paper, we show that the response of lightguides coated withTPB in a UV Transmitting (UVT) acrylic matrix is very similar to that of acoating using a polystyrene (PS) matrix. We obtain a factor of three higherlight yield than has been previously reported from lightguides. This paperprovides information on the response of the lightguides so that these can bemodeled in simulations for future LArTPCs. This paper also identifies areas ofR&D for potential improvements in the lightguide response