calorimeter status
DESCRIPTION
Calorimeter Status. Robert Zitoun Stony Brook D Collaboration Week February 27, 2004. Operation. People. Run by shifters + “on-call experts” Mike ArovAshish Kumar Silke NelsonPierre Petroff (new coordinator) Kirti RanjanJunjie Zhu ICD Andy WhiteBarry Spurlocketc. L1Cal - PowerPoint PPT PresentationTRANSCRIPT
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 20041
Calorimeter Status
Robert ZitounStony Brook
D Collaboration WeekFebruary 27, 2004
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 20042
Operation
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 20043
People
• Run by shifters + “on-call experts”
Mike Arov Ashish Kumar
Silke Nelson Pierre Petroff (new coordinator)
Kirti Ranjan Junjie Zhu
• ICD
Andy White Barry Spurlock etc.
• L1Cal
Dan Edmunds Philippe Laurens
• Dean Schamberger!
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 20044
Improved Hardware Operation
• Calorimeter runs smoothly (only 37’ beam time lost since Jan 1st)
• No power supply failure
• BLS since Nov 24 ● preAmp since Dec 29
• Hardware replaced since Jan 1
• 3 BLS boards ● 9 SCA daughter cards
• Still problems (see later), but
• Days of quick fixing are over
• before swapping hardware, more detailed testing needed
• replacing hardware in short access often harms more than it heals
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 20045
• Upgrades
• Settings by hand → Automatic settings (Silke N.)
• x8 and x1 → x1 only when hardware change
• 10 Hz → 20 Hz (Dean S.)
• Download file
production ~ 20’ → Only 4-5’ (Ursula B.)
• “Random” trigger → Trigger walking through all SCA (uneven SCA population) cells (Dean S.)
• Overall 20’ for inexperienced shifter
• Last pain: needs SMT control
• DB now accessible in framework
Improved Pedestal Runs
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 20046
Improved Calibration Runs
• Before shutdown
• 3 ramp runs taken and analyzedFeb ’02: “historic” run (non linearity coefficients in reco)
Jan ’03 and Feb ’03
• Heavy data taking procedure
• Since Dec 03:
• Trivial data taking procedure (Silke N.)
• Calibration done after each hardware change (~10 times)
• Gain monitoring
• calib done in “offline” mode (data written to tape, offline analysis)
• soon “between store” run: 3 DAC settings (5’); written to DB
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 20047
Tools
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 20048
Pedestal Quality Tools• Bad channels automatically killed before download
• sparking channels: sometimes killed, sometimes not. Kill them permanently?
• Comparison with a reference run
• gives quality of the recent pedestal run
×8 pedestal)
×1 pedestal) ×1 sigma)
×8 sigma)
±1 count
±1 count
±1 count
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 20049
Data Quality Tool• dq_calo: now supports L1 features (Slava Shary)
zero bias jet triggers
L1
METx,y
precision
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200410
Pedestal Viewer• Tool by Chris T. et al.: follow up of ped/noise values
• Catches long term unwanted
behavior
• Have to learn it
• Add diagnosis features
more later
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200411
Problems
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200412
• Problem on BLS. Disappears by itself or at least after next ped run
• However, ~2 pb–1 affected
• Present policy
• Kill only if L3 rate too high (also L1)
• Can be corrected offline
• Large effort by Slava Shary (at Orsay) on pre-shutdown data
• Allows recovering much data. Still need work (<METx,y>)
Occasional Hot Cells/Towers
zero bias <energy>
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200413
Occasional Warm Zones• Happened in 2 different places in
the last month
• Corresponds to individual BLS crates
• Related to voltage instability (badly crimped 5Volt cable)
• Shifts METx by 1 GeV
• Florida State students (Fenghua D. and Haryo S.) working on slow control (archiving/recovery and problem detection)
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200414
ADC noise• Set(s) of 384 channels have a pedestal shift (positive or negative) for a
single event
• Increases with (which?) rate
• Timing and control problem?FPGA code suspected
caught byalgorithm
Notcaught byalgorithm
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200415
Gain Switching• < 20 GeV, analog amplification by ×8
• > 20 GeV, digital amplification by ×8
• Sometimes digital ×8 not done
• Timing and control problem?
• Linked to the checkerboard pattern?
normal channel
problem!
×8
×8×1
×1
high ET e– in crate 10 (John G.)
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200416
Coming Next• New online tools
• easy access to archived slow control data
• slow control history
• early alarms for dying channels: catch temperature rise, voltage drop
• Improving present tools towards better/quicker diagnostics
• Rewriting one unpacker:
• too many archeological strata
• too many unpackers
• Offline Data Cleaning(next transparencies)
• Calibration(next transparencies)
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200417
Offline Data Cleaning
• Now recording zero bias non zero suppressed data (full readout)
• Allow computation of in-run pedestals and noise (not an easy task)
• Flag off-centered cells/regions
• Enter a DB
• Correct for pedestal shifts or kill
• Promising
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200418
Calibration• Run I: signal integrated over a long time
• Insensitive to precise signal shape:
• calibration or physics • electronics parameters
• Insensitive to timing
• Run II: only ~2/3 of signal integrated
• produce calorimeter response non-uniformity
• increase constant term (may be not several percents!)
• At the moment, just slope correction; no timing correction, no calib-phys difference
• Plan to adapt ATLAS method to reduce non uniformity
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200419
• Measure individual channel transfer function H with calib data
• Predict individual physics template pulse
• Channel to channel correction at sampling time
• Work started; still a long way. Will not solve the 4-5% constant term
How to Calibrate Calorimeter?
measured outputknown input
H
cable, traces feed through preAmp + cables + shaper
+ SCA + BLS + ADC
phys
calib known input
H
predicted
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R. Zitoun, Stony Brook Collaboration Meeting 27 February 200420
• People under the charm of conferences until end of March
• Only look at pre shutdown data
• Will rest until May
• New rush towards summer conference
• In June, will discover new problems; find unfixed old ones
• Need people now (not in June) hunting for
calorimeter problems by looking at data
ALARM