Speaker
Please give a brief summary of your poster
A central component of modern collider experiments is the detection of
charged particles and the reconstruction of their trajectories and
momenta. The ATLAS experiment is designed to operate under the
challenging conditions from high energy proton collisions at extremely
high instantaneous luminosities at the CERN Large Hadron Collider.
The ATLAS charged particle tracking system includes a transition
radiation tracker, which consists of 350,000 straws of radius 2 mm
filled with a Xenon-C02 gas mixture. For charged particles with
pseudo-rapidity below 1.6, approximately 35 measurements of the
trajectory are provided between 0.5 m and 1.1 m in radius from the
axis defined by the proton beam. Electron identification is provided
by detection of transition radiation, which is excited from high
velocity particles when they pass through the many polymer fibers that
fill the spaces between the straws. The transition radiation is
absorbed by the Xenon gas inside the straws, leading to ionization two
orders of magnitude larger than expected from the passage of minimum
ionizing particles.
In advance of proton collisions, the TRT has been successfully
commissioned with data collected from the passage of cosmic ray muons.
This poster will present the operational status of the detector, the
performance in terms of charged particle track reconstruction, the
status of the alignment, and contributions to the ATLAS trigger
system. As very high momentum muons can also produce transition
radiation, the detection of transition radiation will also be
presented as well as the expected improvement in electron identification.
