XTC2 Calibration Procedure
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The XTC upgrade uses the XTC2 daughterboards mounted on the TDC's that
read out the stereo superlayers of the COT. These digitize the times that
hits arrive in 6 time bins and transfer the data to the stereo finder card
via a transition board that drives the data upstairs on fibers. The edges
of time bins are controlled by values read from the hardware database and
written to the XTC2 registers. In practice, different channels respond to
the same register values with slightly different time bin boundaries. The
positions of the leading and trailing edges of all 6 time bins for all
channels instrumented by XTC2 cards can be determined using the
TDCTest/XTC Test calibration.
The procedure described here invokes a calibration run in which calibration
pulses generated by the TRACER will be scanned across the dynamic range of the
TDC's and the response of the XTC2 cards will be analysed in the front-end
crates. Upon termination, the XTCC summary bank is formatted and transferred
to the software event builder and will be written to the look area. In the
future, a calibration consumer will analyse the data and fill the database.
Run configuration parameters:
- NEvents : Must equal CotCoarseSettings*CotFineSettings*CotNumSamples+1
- CalibInterval : 46
- Interval 0 : 50
- ExtraDBanks : Enable to write out COTD+XTCD banks on each event, disable for only XTCC bank
- Svx396Mode : Should be enabled
- CotNumSamples : Number of samples per delay point
- CotCoarseSettings : Number of coarse delay steps
- CotFineSettings : Number of fine delay steps
- Extra0 : Mask for TDC channels 0..31 to enable
- Extra1 : Mask for TDC channels 32..63 to enable
- Extra2 : Mask for TDC channels 64..95 to enable
Set Extra0,1,2 = 0 to enable all TDC channels.
To perform the XTC2 calibration:
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Start Run control (type 'setup fer', then 'rc')
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Enable -> TDCTest
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Partitioning -> Select Partition
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Select a hardware partition (<8)
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Parameters -> Select Run Configuration
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Select Private -> Matthew -> TDCTEST_XTC2_COT
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Parameters -> ValidationVeto -> Disable
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Press 'Partition' to go from START to IDLE
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Press 'setup' to go from IDLE to READY
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Press 'XTC Test' to go from READY to TESTING
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Record the run number of the XTC2 calibration in the logbook
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When the calibration reaches the DONE state, it should proceed back to
the IDLE state where it will remain.
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Press 'Reset' and exit run control
To check XTC2 calibrations:
- Retrieve the file from the look area
- It should be in fcdflnx2:/cdf/data/look/icalir/ir<run>.0001cali
- Analyse it using offline tools yet to be described...
Return to Calibration Procedure Home Page
Modified: September 19 2005
by Matthew Jones