Commissioning perspectives for the ATLAS Pixel Detector
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Date
2008-03-18T09:21:58Z
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Abstract
The ATLAS Pixel Detector, the innermost sub-detector of the ATLAS experiment at
the Large Hadron Collider, CERN, is an 80 million channel silicon pixel tracking
detector designed for high-precision charged particle tracking and secondary vertex
reconstruction. It was installed in the ATLAS experiment and commissioning for the
first proton-proton collision data taking in 2008 has begun. Due to the complex layout
and limited accessibility, quality assurance measurements were continuously
performed during production and assembly to ensure that no problematic components
are integrated. The assembly of the detector at CERN and related quality assurance
measurement results, including comparison to previous production measurements,
will be presented. In order to verify that the integrated detector, its data acquisition
readout chain, the ancillary services and cooling system as well as the detector control
and data acquisition software perform together as expected approximately 8% of the
detector system was progressively assembled as close to the final layout as possible.
The so-called System Test laboratory setup was operated for several months under
experiment-like environment conditions. The interplay between different detector
components was studied with a focus on the performance and tunability of the optical
data transmission system. Operation and optical tuning procedures were developed
and qualified for the upcoming commissioning. The front-end electronics preamplifier
threshold tuning and noise performance were studied and noise occupancy of the
detector with low sensor bias voltages was investigated. Data taking with cosmic
muons was performed to test the data acquisition and trigger system as well as the
offline reconstruction and analysis software. The data quality was verified with an
extended version of the pixel online monitoring package which was implemented for
the ATLAS Combined Testbeam. The detector raw data of the Combined Testbeam
and of the System Test cosmic run was converted for offline data analysis with the
Pixel bytestream converter which was continuously extended and adapted according
to the offline analysis software needs.
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Keywords
LHC, ATLAS, Vertexdetektor, Vertex detector, Pixel, Sensor, Pixelsensor, Particle detector, Test beam, Teilchendetektor, Radiation damage, Production, Performance, System test, Readout, DAQ, Noise occupancy, Depletion voltage, Optical communication, Online monitoring, Bytestream converter