Speaker
Yongjie Sun
(Dept. of Modern Physics, University of Science and Technology of China)
Description
A Muon Telescope Detector (MTD) is proposed for the upgrade of the STAR (the Solenoidal Tracker At the
RHIC) experiment at RHIC. By the measurement of muons of a few GeV/c, the MTD will allow the detection of
di-muon pairs from Quark Gluon Plasma (QGP) thermal radiation, quarkonia, and light vector mesons. The
correlation of quarks and gluons as QGP resonances, Drell-Yan production, and the measurement of heavy flavor
hadrons via semi-leptonic decays into single muons are also possible. These measurements will advance our
knowledge of the nuclear matter formed in the relativistic heavy ion collisions at RHIC.
MRPC (Multi-gap Resistive Plate Chamber) with long-strip readout will be used as the detector for the MTD
with its excellent performance and relatively low cost per channel. This first prototype of LMRPC (Long-strip
MRPC) has 10 gas gaps of 250 μm and the signal is read out by six 90 cm long strips of 2.5 cm wide. The test
performance with both cosmic ray and test beam shows that the time resolution is around 70 ps, the detection
efficiency is higher than 95% and the spatial resolution along strips is less than 1 cm. The “real size” prototype
has 6 gaps of 250 μm and the readout strips are 3.8 cm wide. The cosmic ray test shows the efficiency is higher
than 90% and time resolution around 90 ps which is good enough for the MTD requirements. Both the first
prototype and “real size” detectors have been installed in STAR and taken data successfully. The mass production
of the LMRPC will start soon in this year.
Primary author
Yongjie Sun
(Dept. of Modern Physics, University of Science and Technology of China)
