Speaker
Toru Tamagawa
(RIKEN)
Description
We have developed the GEM foils with polytetrafluoroethylene (PTFE) film as an insulator layer for the first time. Since the PTFE film is hard to be carbonized by arc discharge, the PTFE-GEM is expected to be strong against break down. We have experimentally nfirmed that the PTEF-GEM was really robust against discharge. The gain we achieved was larger than 2.6e+4 for 50 micron-thick PTEF-GEM in Ar/CO2=70%/30% gas mixture at the voltage between GEM electrodes Vgem=730 V. The PTFE-GEM foil was NEVER broken ven when it suffered more than 40 thousand discharges during the experiment. We think that PTFE is one of the excellent insulator material for GEM productions. At the conference, we will present the production procedure and the detail of our experiment for valuating the PTFE-GEM.
