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| Current Activity |
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The UCSB group is involved in
- development of a suite of web-based monitoring (WBM) tools to aid shifters during tracker commissioning and for general use
in data quality monitoring.
- improvement of the tracker DAQ system
- design and development of the tracker control and safety system (TCS/TSS),
including a software (PVSS) counterpart of the PLC-based safety system for the tracker
- development setups for tracker cable checkout and tracker commissioning tools
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Initial FEA studies have been done investigating the use of cold point cooling at the end of the tracker barrel in
addition to or in place of running fluid cooling lines. Work is also ongoing on detector simulation studies using
GEANT. A software package is under development that allows changes in detector geometry to be explored in an
automated and systematic way. Ranges of detector geometry parameters, such as layer radii, are specified in
a configuration file which is used to automate a series of simulation runs. At the end of the runs a summary
html file is created for a quick overview of the effect of the geometry changes on simulated detector performance.
Such a program will allow a more detailed optimization of designs for the CMS upgrade.
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| Past Activity |
In the summer of 2006 the US CMS tracker group
completed fabrication and testing of 125 m^2 of Silicon detectors
with over 4 million individually instrumented microstrips. The UCSB group
carried 60 % of the US load which included the installation of detector
modules into larger sub-structures called rods.
More info
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Many members of our group contributed to the integration and commissioning of the tracker
at CERN.
Each rod was optically inspected and electrically tested upon arrival at CERN.
After insertion into the TOB, rods were again tested for electrical connectivity of controls,
power supply and bias voltage, optical connectivity of readout channels,
cooling performance, noise performance and system issues.
Insertion and testing was done in units of a cooling-segment,
the smallest set of rods that can be cooled, controlled and read out together,
between 8 and 22 rods each.
Final DAQ hardware, power supplies, and software components
were used as much as possible in this testing.
All rods were installed and validated by the end of 2006
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In 2007 a slice of more than 10 % of the tracker, corresponding to about 1 million channels,
was used to collect cosmic ray events at the Tracker Integration Facility (TIF) at CERN .
This data was useful to validate the detector, test sub-system performance,
and develop tools for next year's commissioning with beam.
A brief description is given below of topics we've studied in this calibration
and cosmic ray data:
check for cross-talk between subsystems,
measurement of TOB S/N and pre-alignment resolution,
monitoring of data quality in calibrations,
validation of the online zero suppression algorithm,
cluster threshold optimization,
alignment with cosmic tracks,
and a check of the scattering induced resolution function.
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In parallel with the completion of the TOB and full integration of all
tracker subsystems at the tracker integration facility (TIF), the
completion of the tracker services at the collision hall (Point 5) has been
a critical-path task for the CMS experiment. UCSB engineers and technicians,
have been active in providing help to CMS in this area.
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