Optical fiber read-out for liquid argon scintillation light

Understand

In this paper we describe the performance of a light detector for Ar scintillation light made of wavelength-shifting (WLS) fibers connected to Silicon-Photomultipliers (SiPM).

• The setup was conceived to be used as anti-Compton veto for high purity germanium (HPGe) detectors operated directly in liquid Argon (LAr).
• Background suppression efficiencies for different radioactive sources were measured in a test cryostat with about 800 kg LAr.
• This work was part of the R\&D effort for the GERDA experiment.