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The tests focused first on Integration
of SCT into ATLAS run partition |
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New TDAQ version |
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The first day, cooling plant shutdown
due to a series of problems mainly due to the control system and took 24 h to
solve |
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The second day checking SCT with ATLAS
Trigger |
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1kHz random triggers from CTP |
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some evidence of moving BCID mismatch (not understood) |
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ECRs ok |
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Stop at 33K events due to eventfilter not receiving ECRs |
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ECR problem (33K event limit) fixed by
Thilo (ATLAS trigger) |
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Tuesday evening and following night was
spent to then dedicated to adjust the SCT barrel readout timing for cosmic
triggers |
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Used the scintillator trigger from TRT |
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in the pit placed on top of ATLAS (on
level 8) |
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TRT sector 13 on and partial sector 7 |
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SCT all 4 barrels (2112 modules) except
3 cooling loops (~ 150 modules) |
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No EC - barely enough C3F8 for all but focus
on integration instead of bringing in endcaps too (and risking to fall below
threshold) |
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Tuesday night |
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Switch to scintillator (cosmics)
trigger |
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TRT already seeing tracks |
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Started timing scan |
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Accelerate timing adjustment by using signal
threshold of 1.2fC |
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Gradually shift SCT timing and watch
for tracks on event display! |
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Wednesday morning 20 Feb |
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realized timing probably just out of range of SCT timing
range |
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added 3 clock delay in CTP |
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fixed SCT BCID FE/ROD mismatch |
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synch fully with CTP and TRT |
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started seeing tracks in final time bin |
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the first cosmic tracks were
reconstructed in SCT and TRT within hours. |