Speaker
Shoji Uno
(KEK, Tsukuba)
Description
We constructed a GEM chamber using new GEM foils, which are produced
using a new etching method by an Japanese company. The new method has
two steps (Plasma and Laser) to make holes in a flexible printed circuit
board. Similar effective gas gain was obtained in a triple GEM chamber using
new GEM foils, as compared with the standard CERN GEM. It is possible to
make holes in thicker foils using the new etching method. New GEM foils
with 100μm thickness were produced in order to get higher gas gain with a
single GEM foil. Obtained result shows the effective gas gain is much higher
in the same electric field, as compared with double GEM chamber using two
standard 50μm GEM foils. Using new thicker GEM foils make the chamber
structure simpler and it is promising to make chamber with a cylindrical
shape in near future.
Author
Shoji Uno
(KEK, Tsukuba)
