Speaker
Mr
Yuki Mitsuya
(The University of Tokyo)
Description
The glass gas electron multiplier, glass gem (G-GEM), is a GEM based detector which is composed of a photoetchable glass substrate (PEG3, HOYA Corporation, Japan). Its improved spark tolerance and mechanical stability provides better handling and simple detector setup. No outgassing from the substrate enables the long-term sealed operation of detectors.
In this research we report on the recent results of a new G-GEM composed of crystalized photoetchable glass (PEG3C). PEG3C is a crystalized type of PEG3 glass. The crystalization process is done by heat treatment. Its improved mechanical robustness (higher young's modulus and bending stress) enables arbitrary design of a detector such as a G-GEM with thinner substrate. The less deflection of the detector across its sensitive area is also achievable.
We designed a crystalized G-GEM with the geometry of 680 micro-meter thickness, 280 micro-meter hole pitch, and 170 micro-meter hole diameter. We investigated the basic characteristics of this crystalized G-GEM. The maximum effective gas gain of 25000 was achieved with a single stage G-GEM in Ar/CO2 90/10 gas mixture. The maximum gain was the similar value of that of non-crystalized G-GEM. The gain stability was also investigated. The gain decreased 20 % in the timescale of 30~60 minutes after applying high delta-V across the G-GEM, then it reached the plateau. The energy resolution of 24 % (Fe-55, 5.9 keV) at the gain of 6300 was obtained. We demonstrated an X-ray radiography of a small mammal with the analogue readout system. The spatial resolution of 110~130 micro-meter in sigma was obtained.
Primary author
Mr
Yuki Mitsuya
(The University of Tokyo)
Co-authors
Prof.
Christina Streli
(Vienna University of Technology)
Dr
Eraldo Oliveri
(CERN)
Dr
Filippo Resnati
(CERN)
Prof.
Hiroyuki Takahashi
(The University of Tokyo)
Prof.
Leszek Ropelewski
(CERN)
Mr
Patrik Thuiner
(Vienna University of Technology)
Dr
Takeshi Fujiwara
(AIST)
Dr
van, Miranda Stenis
(CERN)
