developing a new light detection system that employs
light guides. In liquid argon, scintillation light is
produced when charged particles in the event produce
excimers that proceed to radiate 128 nm ultraviolet (UV) photons. The UV light
must be shifted to the visible before
detection. A coating is applied to acrylic bars with a matching
index of refraction. This shifts the light to the blue, which is then
captured and guided to the end where silicon
photomultipliers read out. In the above
photograph, a UV flashlight shines on the center of the lightguide.
The glowing ends show the visible light that is guided. The image below illustrates how the lightguide works.
Our new system can replace the MicroBooNE-style systems that are commonly used in LArTPCs. A first major study of the system will occur in SBND (the Short Baseline Neutrino Detector), formerly known as LAr1ND. This experiment also act as a near detector for the MicroBooNE experiment, as well as make cross section measurements. Our system is under consideration for DUNE (Deep Underground Neutrino Detector), and a set of lightguides will be run in protoDUNE, the prototype experiment at CERN.
We originated the concept of lightguide detectors for liquid argon. Please read our latest paper here which is submitted to JINST.
This page was updated May 2016