Speaker
Fabian Kuger
(Bayerische Julius Max. Universitaet Wuerzburg (DE))
Description
Resistive Micromegas (Micro MEsh Gaseous Structure) detectors have
proven along the years to be a reliable high rate capable detector technology
characterised by an excellent spatial resolution. The ATLAS collaboration
has chosen the resistive Micromegas technology (mainly
for tracking), along with the small-strip Thin Gap Chambers (sTGC,
mainly for triggering), for the phase-1 upgrade of the inner muon
station in the high-rapidity region, the so called New Small Wheel (NSW). The NSW requires fully efficient Micromegas chambers with spatial resolution better than 100$\mu$m independent of the track incidence angle and the magnetic field (B<0.3T), with a rate capability up to ~10kHz/cm$^2$. Along with the precise tracking the Micromegas chambers
should be able to provide a trigger signal, complementary to the sTGC,
thus a decent timing resolution is required. Several tests have been
performed on small (10x10cm$^2$) and medium size (1x0.5m$^2$) resistive
Micromegas chambers (bulk type and mechanical floating mesh type)
using medium (10GeV/c) and high (150GeV/c) momentum hadron beams
at CERN including measurements inside magnetic field. Results on the
measured efficiency, position and timing resolution will be shown demonstrating
the excellent characteristics of the detectors that fulfill the
NSW requirements. In addition, early test results from the first full size
(2-3m$^2$) operational modules that will be realised during 2015, will be
presented.
Author
Fabian Kuger
(Bayerische Julius Max. Universitaet Wuerzburg (DE))
