# Presentation: 550630

## Calorimeter Status

**Robert Zitoun**
**Stony Brook**
** ****D**** Collaboration Week**
**February 27, 2004**

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## Operation

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## 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 2004

## Improved Hardware Operation

**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

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## 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

- 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**

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## Improved Calibration Runs

**Improved Calibration Runs**

- Before shutdown
- 3 ramp runs taken and analyzed	Feb ’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 2004

## Tools

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## 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

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## 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 2004

## Pedestal Viewer

**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

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## Problems

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## 

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>)

- 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**

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## Occasional Warm Zones

**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)

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## 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

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## 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?

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## 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 2004

## 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 2004

## Calibration

**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

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

## 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

- 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?**

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004

- 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

- R. Zitoun, Stony Brook           Collaboration Meeting

- 27 February 2004