Speaker
Antony Sarrat
(Saclay)
Description
A large volume TPC will be used in the near future for a variety of
experiments, including T2K and probably the Linear Collider detector. The
“bulk” Micromegas detector is a novel Micromegas construction technique
particularly suited for building compact and robust low mass detectors. The
capability to pave a large surface with a simple mechanical solution and
negligible dead space between modules is of particular interest for these
applications, offering a simple and cheap alternative to wire chambers. We
have built and tested two large “bulk” Micromegas detectors (26x27cm 2,
8x8mm 2 pads, 1020 channels) in the HARP field cage setup at CERN with
magnetic field up to 0.4 T. Cosmic ray data have been acquired in a variety
of experimental conditions. We present the excellent detector performances,
especially with an Ar-iC4H10-CF4 gas mixture, with gains in excess of
10000, space point resolution of 600 microns at 1 m drift, and dE/dx
resolution of 12 %. We discuss future developments towards a large area,
low cost Micromegas solution for industrial production. Improvements on the
space point resolution with the use of a resistive anode are also discussed.
Authors
Antony Sarrat
(Saclay)
Marco Zito
(Saclay)
