R. Zitoun, Stony Brook Collaboration Meeting 27 February 20041

Calorimeter Status

Robert ZitounStony Brook

D Collaboration WeekFebruary 27, 2004

R. Zitoun, Stony Brook Collaboration Meeting 27 February 20042

Operation

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!

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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• 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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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

R. Zitoun, Stony Brook Collaboration Meeting 27 February 20047

Tools

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

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

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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Problems

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>

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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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

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.)

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)

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

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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• 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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• 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