Speaker
Dr
Boyd Jamie
(CERN)
Description
The ATLAS detector at CERN's LHC will be exposed to proton-proton
collisions from beams crossing at 40 MHz. At the design luminosity
there are roughly 23 collisions per bunch crossing. ATLAS has designed
a three-level trigger system to select potentially interesting
events. The first-level trigger, implemented in custom-built
electronics, reduces the incoming rate to less than 100 kHz with a
total latency of less than 2.5$\mu$s. The next two trigger levels run
in software on commercial PC farms. They reduce the output rate to
100-200 Hz.
In preparation for collision data-taking which is scheduled to
commence in November 2007, several cosmic-ray commissioning runs have
been performed. Among the first sub-detectors available for
commissioning runs are parts of the barrel muon detector including the
RPC detectors that are used in the first-level trigger. Data have
been taken with a full slice of the muon trigger and readout chain,
from the detectors in one sector of the RPC system, to the
second-level trigger algorithms and the data-acquisition system. The
system is being prepared to include the inner-tracking detector in the
readout and second-level trigger.
We will present the status and results of these cosmic-ray based commissioning
activities. This work will prove to be invaluable not only during the
commissioning phase but also for cosmic-ray data-taking during the normal
running for detector performance studies.
| Submitted on behalf of Collaboration (ex, BaBar, ATLAS) | ATLAS |
|---|
Author
Dr
Boyd Jamie
(CERN)
