[2H16-20] 計測回路・解析技術

[2H19] Glass Gas Electron Multiplier Characterization for Muon Detectors

*Hamdan Moh¹、Mitsuya Yuki¹、Shimazoe Kenji ¹、Takahashi Hiroyuki¹ (1. The University of Tokyo)

キーワード：Radiation Imaging、Muon Imaging、Micro Pattern Gas Detectors (MPGDs)、Gas Electron Multiplier (GEMs)、Glass Gas Electron Multipliers (G-GEMs)

This study introduces and characterizes glass gas electron multipliers (G-GEMs) for potential application as muon detectors. Two types of G-GEMS were fabricated with photosensitive etchable glass (PEG) and borosilicate glass substrates, each employing Cu/Cr and Cu/Ti electrodes, respectively. The G-GEMs featured hole diameters ranging from 80 µm to 170 µm, pitches from 130 µm to 280 µm, and thicknesses from 300 µm to 680 µm with sensitive area of 100 × 100 mm ² . G-GEM was positioned between an aluminized Kapton cathode and an ITO-coated glass anode with drift gap of 5 mm and induction gap of 3 mm. The detector was operated with an Ar/CH ₄ (90:10) gas mixture at flow rate of 20 mL/min and pressure of 0.1 MPa. The resistor chain was utilized to apply high voltage for the cathode and G-GEM electrodes while keeping the anode at grounding potential. Characterization of the G-GEMs employed radiation of X-ray from ⁵⁵ Fe and beta ray from ⁹⁰ Sr sources. The detector system was stacked with a plastic scintillator-based detector to evaluate the detection capability for cosmic muon based on coincidence event analysis.