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

May 7, 2010 B.M. Barnett - STFC/RAL - L1Calo Joint Meeting 8

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

May 7, 2010 B.M. Barnett - STFC/RAL - L1Calo Joint Meeting 9

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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