Development of a large area gas photomultiplier with GEM/$\mu$PIC

TL;DR

This paper reports the development of a large-area gas photomultiplier combining GEM and $$PIC technologies with a CsI photocathode, achieving high gas gain and single photoelectron detection for potential use in large liquid Xe detectors.

Contribution

Introduction of a novel large-area gas photomultiplier with integrated GEM/$$PIC and CsI photocathode, demonstrating high gain and single photoelectron detection capabilities.

Findings

Achieved gas gain of 10^5 with Ar+C2H6 (10%) gas.

Successfully detected single photoelectron from UV photons.

Demonstrated potential for use in large liquid Xe detectors.

Abstract

We are developing a new photon detector with micro pattern gaseous detectors. A semitransparent CsI photocathode is combined with 10cm$\times$10cm GEM/$\mu$PIC for the first prototype which is aimed for the large liquid Xe detectors. Using Ar+C$_2$H$_6$ (10%) gas, we achieved the gas gain of $10^5$ which is enough to detect single photoelectron. We, then, irradiated UV photons from a newly developed solid scintillator, LaF$_3$(Nd), to the detector and successfully detected single photoelectron.