Development of gaseous PMT with micropattern gas detector

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 610; no. 1; pp. 164 - 168
• Main Authors: Tokanai, Fuyuki, Sumiyoshi, Takayuki, Sugiyama, Hiroyuki, Okada, Teruyuki, Ohishi, Noboru, Ohmura, Takayuki, Sakurai, Hirohisa, Gunji, Shuichi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 21.10.2009
• Subjects: Gaseous PMT; Glass capillary plate; Micropattern gas detector; Gaseous PMT; Micropattern gas detector; Glass capillary plate
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2009.05.111

We have developed gaseous photomultiplier tubes (PMTs) with a bialkali photocathode, combined with micropattern gas detectors (MPGDs) such as a glass capillary plate (CP), a gas electron multiplier (GEM) and a Micromegas detector. Gaseous PMTs with two different gas mixtures of Ar (90%)+CH 4 (10%) and Ne (90%)+CF 4 (10%) were investigated at a gas pressure of 1 atm. Quantum efficiencies of up to 12% were obtained for both neon and argon gas mixtures. A new glass CP made of Pyrex glass has been developed for a hole-type MPGD. The glass is well-suited for high-level cleanliness and reaction conditions required for the production of bialkali photocathodes. A gain of up to 1.5×10 4 and an energy resolution of 23% were obtained for 5.9 keV X-rays. This latest result and the basic performance of the gaseous PMTs are described.