L1Calo Run Coordination Summary
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Transcript of L1Calo Run Coordination Summary
L1Calo Run Coordination
Summary
Bruce M. BarnettSTFC, Rutherford Appleton Laboratory
Level-1 Calorimeter Trigger Joint MeetingMay 5-7, 2010
May 7, 2010 1B.M. Barnett - STFC/RAL - L1Calo Joint Meeting
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Overview
• Overview• Time line• Blow-by-blow• Operational issues• Future beam• Future work
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Time line
• Heidelberg Meeting– 11th -13th January
• Splashes – 28th February– The trigger everybody
loves• ring of fire trigger
annulus eta 1.6 -> 2 (and reflection in eta for beam 1)
• (mostly) Tile A cells
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Time line
• Nice Events– 5th April
• World record– 19th March
• Nice Events– 5th April
• Lumi grows– In jumps and starts
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Blow-by-blow
• January– Firmware fixes, calibrations, stopless removal– 29th January
• rxfactors_veit_calib_lar_144829_tile_143479.dat
• February– Jep0-cmm1
• Readout errors: clock phases fixed– JEP blocked hoses
• OPM cleans and purges– Calibrations, firmware, rate-tests, LHC dry runs– 24th February
• EtConversion:CalibGains:MskOvEmecOnly• TBB gains updated to delay_phys_20100223 from delay_phys_20100112
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Blow-by-blow
• March– Energy scans, (Tile/Larg: 2/3 March)– Occasional g-link error one link– (Cmm) Firmware, monitoring, noise hunts– Simulation Errors … Prompt fixes to code– MCM Replacements– Receiver segment, Larg to L1Calo migration tests– Calibration runs, phos4 saturation runs– CP Rare-RoI error investigations & h/w fix– 1st March
• EtConversion:CalibGains:MskOvAlt1– 26 March
• rxfactors_veit_calib_lar_144829_tile_151144_fcal_149451.dat
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Blow-by-blow
• April– 1st April
• Noise Thresholds to nominal (4/4 from 3/4), Cosmics re-enabled
• Online monitoring from physics events only• Start to see luminosity dependent trigger rate!
“Got ~4 million events - and the ephemeral glory of the data taking record: ~20 microbarn-1.”
– 8th April• Timing
A few badly timed channels …• Occasional spiky triggers
Causing irritation through EMPTY (Cosmic) triggers• More simulation errors
MCM related: fixed MCMs with readout issues• Online monitoring
ATHENA Stability problems» due to database-access issues at startup
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Blow-by-blow
• April– 15st April
• Pedestals Poorly set, particularly in Tile, after Intervention (8th March)
» Error in validation procedure crept in during last s/w update.
• AND …. Is the FJ Rate too low? Really?• Hardware
New broken channel in FCAL1 (0x04100f03)» For next scope session
In Run 152772 (April 9th)» one cable from JEM0-CMM0 to
JEP1-CMM0 (Energy Mergers) found itself disabled.
Simulation errors and fixes• Larg Receiver Work
Bad channel investigations• Updated to 2010 Splash timings
Prior to run 152705• Attempted E Calibration
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Blow-by-blow
• April– 22nd April
• PPM Readout Occasional G-Link Parity errors PP1-PPM15
• Larg E Scan April 16th (Damien/Martin)
– 29th April• Occasional cosmic (EMPTY items) burps• Noise cut tests (3/4)• 3-4 day technical stop
ATONR migrations Calibrations
EM2J5
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Operational issues
• Calibration– Energy scans infrequent
• Currently expert activity• Calibration slots between fills are
1 hour …. A bit short for anything but PEDS/DACS 3 hours. Fewer of these and often at unsociable times
• Shifter should call … but often forgets• Shift leader should publish e-log
But these aren’t in real-time
– Solution• Need to provide shifter-friendly software
Exceptionally robust so as to preclude failures/confusions• Provide default calibration rules
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Future beam
• “Original” approved steps
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Future beam
• How to get there?– Fat bunches? – Bunch trains?
• (50 ns spacing) – crossing angles?
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Future beam
As Presented at ATLAS Weekly Meeting, May 4, /2010
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Future work
• Shorter term– Noise cut studies (ongoing)– Calibration issues (eg, FCAL)– Re-do phos4 runs for saturated pulse studies– Confirm/tweak timing with aggregated TeV statistics (June?)– Overlap cable timing/lengths
• Longer term– Mini-phos4 scans with beam– TBB and Tile layer timing– Fully optimised filter coefficients– Dead channel corrections– Energy scales (EM/HAD)
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