Evaluating Fast Multi-Channel Photosensors and Readout Electronics for Large Neutrino Detectors

• Viacheslav Li (LLNL)

To achieve high energy resolution in large-volume neutrino detectors, it is essential to ensure good photocoverage and use an affordable detection medium. New detection media, such as water-based scintillators, have opened up new opportunities in high-energy physics and nuclear nonproliferation through antineutrino reactor monitoring. Fast, large-area photosensors and multi-channel fast-timing readout electronics are becoming increasingly accessible to researchers. In this talk, we present the progress made at LLNL in testing LAPPD and fast-timing electronics. We are currently evaluating readout options for LAPPD Gen2 based on 4-channel AARDVARC and 32-channel HDSOC systems-on-a-chip from Nalu Scientific. For the Ocean Bottom Detector, we will also discuss options available at LLNL for detection medium and testbed capabilities, as well as simulation capabilities inherited from the AIT/WATCHMAN R&D. This work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. Release Number LLNL-ABS-871664.

Geoscentific motivation and application of OBD

• William McDonough (Tohoku)

Overview of OBD project

• Hiroko Watabe (Tohoku)

Hardware development for prototype detector

• Takanobu Ono (Tohoku)

We are currently developing a prototype detector that will be the first step in the OBD project to realize the idea of a large detector for neutrino observation. Since the deep sea is a very different environment of low temperature and high pressure compared to detectors on continents, it is essential to develop detector elements adapted to this environment. In this presentation, I will discuss following points: performance evaluation of liquid scintillator at low temperature development of the photodetector modules with IceCube collaboration development of the pressure compensation hose to compensate for the decrease of LS in the deep sea.

Simulation study of OBD

• Simran Chauhan (Tohoku)

We have performed simulations in Geant4 for a 17kt size Ocean Bottom Detector and optical simulations for small prototype. I will talk about following points: Estimation of the number of expected geoneutrino and background events in 17kt detector Expected energy spectrum optical simulation tool for small prototype to count the number of photons produced Estimation of signal intensity loss due to detector design using Geant4 and ROBAST.

Nalu tour and electronics talks: Talk by a representative from Nalu Scientific and Tour to Nalu Scientific (Manoa Innovation Center)

Charged-current interactions on nuclei for low energy geoneutrino detection

• Sam Hedges