ECAL DPG

1
ECAL DPG

• P. Meridiani
• CMS Italia
• 13/02/2007

2
Outline

• ECAL Achievements in the 2006
• Task list organization of the new ECAL DPG

3
Achievements in the 2006

• From June 2006 ECAL community has been splitted
  into several experimental setups
• TB _at_ H4 (ECAL)
• TB _at_ H2 (ECAL HCAL)
• Cosmic setup
• MTCC
• Several achievements in different technical areas
• Full transition to CMSSW
• LocalReco
• Simulation
• DB
• DQM
• DAQ Trigger firstly integrated and validated
• Laser operations towards final setup
• Italian contributions has/will been/be flagged
  

P. Meridiani, A. Ghezzi
F. Cossutti, C. Rovelli
F. Cavallari, S. Rahatlou
G. Della Ricca, F. Cossutti, B. Gobbo, A. Ghezzi
4
H4

• 4 periods, from July 24th to Nov 12th, for a
  total of
• 70 days of data taking, ?6300 runs, 2 billions
  electrons
• To summarize
• First goalIntercalibration (9 SM (1 twice), 1/4
  of EB))
• Energy Scan linearity (15-250 GeV, in M1, M3,
  M4 and as function of eta)
• Gap cracks, corners edges
• Xtals Monitoring and Laser operation
• Irradiation (5 Xtals)
• Trigger primitives
• Zero suppressions
• Synchronous running
• Muons

5
Intercalibration at H4 1

• 9 SM put on the beam, of which one repeated twice
• Better than what expected considering that beam
  arrived with ?1 month delay
• At regime intercalibrating 1 SM (1700 xtals) took
  less than 2 days
• Different intercalibration methods tested
  intercalibration using the single crystal response

All 9 SMs
Corrected single crystal response
Intercalibration reproducibility in a two months
period (SM22)
5x5 resolution at 0.7 _at_ 120 GeV
A. Benaglia, P.Govoni, A. Martelli, M. Paganoni,
D. Riparo, R. Salerno, V. Tancini
6
Intercalibration at H4 2

• In situ intercalibration methods based on the
  energy reconstructed in a cluster (typically 5x5)
• Different techniques can be used to evaluate
  single crystal intercalibration (matrix
  inversion, iterative algorithms)

Performances compatible w.r.t. single crystal
intercalibration
A. Benaglia, P.Govoni, A. Martelli, M. Paganoni,
D. Riparo, R. Salerno, V. Tancini
7
Energy/position resolution, noise

• Analysis is still on going
• Basically a confirmation of the 2004 results,
  where most of the details of the amplitude
  reconstruction were understood

Energy resolution in 3x3 using 35 weights
Noise in ADC counts
Preliminary
Preliminary
C. Rovelli
8
Tuning the MC

• More effort has been put on MC validation/tuning/c
  omparison w.r.t 2004. Last possibility to tune MC
  before CMS
• In particular
• Lateral containment
• On going work together with G4 developers to
  understand/correct discrepancies

Using both G4.7 G4.8 shower is 1 broader in
sim (looking at E1/E25) Situation is reversed
w.r.t G4.5 (1 narrower sim), change seems to be
due to variation in the implementation of
multiple scattering Relative variation with ? and
? are instead very well reproduced
F. Cossutti, C. Rovelli, P. Meridiani
9
Dead channel correction

• H4 data can also be used to evaluate dead channel
  corrections
• Main idea is to measure in the data the
  correlation between the energy content of the
  non-functioning channel with the channels in a
  5x5 crystal matrix
• Correlation functions depend on the ?, ? of the
  crystal,
• particles energy and impact position
• Simple approach and more refined (neural net)
  have been explored. Both seem to work fine

Corrections being implemented as a standard CMSSW
module Also map of noisy/dead channels being
implemented in Offline DB
S25reco_corr/S25reco Resolution ()
Energy (GeV)
10
25ns bunch structure

• A 25-ns bunched beam was delivered for 10 days
  (end of september) to H4
• Accelerator clock and orbit signals received by a
  LHCrx module and distributed to CCS/DCC/TCC via
  the TTCci.
• Trigger Primitives acquired and TCC data written
  in the event. Used to validate CMSSW TPG emulator

The 25 ns beam sub-structure as seen from H4 TDC.
11
H2
Lots of data with different beams (e, ?- , ?- on
target) with E (1?300GeV) More difficult
experimental condition environment with respect
to H4 For example ECAL temperature is not as
stable as H4 Also beam contamination delicate
beam cleaning/particleId required for all analysis
12
ECAL intercalibration _at_ H2

• Intercalibration methods used at H4 have been
  adapted for H2 running
• Temperature variations (0.1C) (corrections needs
  to be applied before calibration)
• Less statistics for each xtal than H4
• Wider beam
• Beam contamination

S1 calibration results
After cal.
5x5 resolution _at_ 50 GeV 2 Still larger than
expected.
Before cal.
ADC counts
D. Del Re, R. Paramatti, S. Rahatlou
13
Combining ECALHCAL

• On going work optimization of the combined
  ECALHCAL response
• Choosing optimal weights for combining ECAL
  HCAL energies
• E?EECAL?EHCAL
• Different calibration schemas are being tried in
  order to optimize resolution and linearity

14
?0 run _at_ H2
Resolution using S1 calibration ?(?0)
4.8 ?(?0) 3.7
?0
?0
20GeV beam
Runs taken at 3 energies 9, 20, 50 GeV Being
used to optimize the pi0 reconstruction/selection
A simple test of the ?0 calibration algorithm
has been performed
After calibration
Before calibration
D. Del Re, D. Franci, S. Rahatlou
15
Cosmic Intercalibration

• Every integrated SM is/will be tested for around
  one week using a specific cosmic setup (located
  in H4)
• 10 inclined SM
• APD HV raised to have gain 200
• About 5 million triggers are collected for each
  SM
• Useful for two main reasons
• Initial commissioning of the integrated SM
• Preliminary intercalibration coefficient can be
  computed at a precision of around 2 for all
  channels
• Systematics w.r.t to beam intercalibration are
  under detailed study

F. Ferri, A. Ghezzi, S. Ragazzi, T. Tabarelli
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ECAL _at_ MTCC

• 2 SMs at 11 oclock
• Gain 200 (S/B ? 30 for aligned muons)
• Events with muon signal in ECAL
• 0.5 of DT trigger
• 0.15 of CSC trigger
• Checks with/without magnetic field
• Pedestals/Noise
• Observed variation of the value of the pedestal
• but noise is unchanged
• Muon signal amplitude/timing
• Amplitude unaffected, small variation of the
• timing (?3ns) still under investigation

17
DAQ Trigger

• ECAL DAQ software system
• The ECAL DAQ software system has been used in H4,
  H2 (HCALECAL) and MTCC (integrated with Global
  DAQ Trigger)
• Final H4 test-beam version (release ECAL_0_1_0,
  based on XDAQ_V3.5.2 and SLC3) has been closed
  and archived.
• Work to port it to XDAQ_V3.7.3, SLC4 /64-bits is
  in progress.
• In H4 also full DAQ Hardware integration has been
  achieved
• Full ECAL triplet CCS, DCC, TCC
• MATACQ board 1-ns sampling of laser pulse for
  monitoring purpose
• TODO
• Move toward SLC4 / 64-bits
• Software system is done to support 36 SMs in EB.
  To be adapted to include Endcaps
• DAQ and Trigger configuration from DB (tables
  implemented, but read now from XML)

18
Databases

• The DB and its access tools have been operated at
  H4 and H2 test-beams
• DCS Configuration DB (via PVSS) has been tested
  and works fine.
• DCS Condition DB (via PVSS) has performance
  issues.
• DAQ/Trigger Condition DB run records and
  DAQ/Trigger configuration keys are written in the
  Condition DB. Writing of summary histograms will
  be implemented.
• DQM (Data Quality Monitor) logging to Condition
  DB works well.
• DCU measurements (APD temperaturescurrents,
  electronics temperatures, LV settings) are
  written to Condition DB via C API.
• Most offline DB objects have been implemented and
  integrated into the CMSSW reconstruction

F. Cavallari
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DQM

• ECAL DQM has been widely used in all the setups
• 2006 has been spent in continuous
  update/development/upgrade
• Many useful low level detector tasks have been
  implemented, used to spot problems/debug the
  system
• data integrity
• pedestal mean/noise
• signal pulse shape
• laser/test-pulse amplitude timing response
• trigger primitives activity
• Some TB physics oriented task have been also
  developed
• Cosmics occupancy and energy spectrum
• beam energy deposit (max crystal, 3x3 matrix)
• beam profiles as measured by hodoscope
• energy deposit vs. beam position
• To be moved towards the CMS physics

F. Cossutti, G. Della Ricca, A. Ghezzi , B. Gobbo
20
An example of a H4 DQM page
F. Cossutti, G. Della Ricca, A. Ghezzi , B. Gobbo
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Laser monitoring

• Laser needed to track xtal trasparency changes.
• 1300 Laser runs taken in the H4 setup.
• This data volume is equivalent to 10 hours of
  full CMS running
• All data at H4/H2 have been processed
  quasi-online using the DQM infrastructure.
  However, this is different from the online laser
  farm that well need in CMS
• Stability APD/PN ratios for each channel
• Overall stability good, even without refined
  corrections.
• But detailed workflow from laser events to
  corrections is still to be demonstrated...

22
Laser Monitoring

• H4 stability
• H2
• In H2 night/day effects are larger (no room with
  stabilized T).
• Anti-correlation between T and APD/PN ( -2/C)
  as expected.

Stability 1.4 from gauss fit to peak.
Long tail under study, but overall stability is
satisfactory
D APD/PN
H2 testbeam Black APD/PN, averaged over 100
channels. Red DT/201
23
ECAL in-situ calibration status

• Different calibration methods as described in
  PTDR needs to be merged into a coherent plan
• Since PTDR big effort has been put on ?0
  calibration
• 4 internal notes have been produced by different
  groups
• To exploit full potential these events need to be
  selected from L1 accepted events
• Special stream/trigger techniques are being
  designed
• Additional effort improve/put calibration in
  CMSSW.
• 2007 should be dedicated to
• Coherent plan for calibration including first
  year data taking
• Definition of detailed workflow

D. Del Re, D. Franci, P. Govoni, M. Paganoni, A.
Palma, R. Paramatti, S. Rahatlou, R. Salerno
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Tasks

• DQM
• Coordination and responsible for basic services
• Many of the other tasks listed below involve or
  require DQM
• Amplitude reconstruction
• And digitization
• DCC operation
• Data unpacking, and Digi to Raw translator
  endcap specific mapping issues
• TCC operation
• Trigger Primitives
• Emulation
• Selective Readout Processor
• Emulation algorithm(s) for low luminosity
• Synchronization and timing

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Tasks2

• Databases
• Calibration and alignment
• Calibration methods and algorithms
• Use of precalibration
• Phi symmetry
• ?0
• Z?ee
• Z????
• Single electron
• low level calibration
• Pedestals gain ratios dead channels
• Crystal transparency corrections (Laser)
• Alignment
• Clustering
• And cluster corrections
• Simulation
• Geometry (new into CMSSW 140)
• Shower simulation

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Tasks 3

• Preshower issues
• Try to integrate the preshower aspects within the
  other categories
• Event display
• Global performance monitoring
• alias offline DQM

27
Sub-boxology

• ECAL framework
• Data format, raw data, time frames,amplitude
  reconstruction, application of calibration
  constants
• Reconstruction
• Clustering, superclustering and corrections
• Calibration and alignment
• Calibration
• Laser transparency corrections
• Alignment
• Low level calibration (pedestals, gain ratios) ?
• Simulation
• Geometry
• Shower simulation (GEANT and FAMOS)
• Databases
• DQM
• Testbeam analysis

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Contacts

• Offline Reconstruction
• Low level reconstruction Paolo Meridiani (ad
  interim)
• Clustering David Futyan (ad interim)
• Offline Simulation
• Overall Fabio Cossutti (ad interim)
• Geometry Brian Heltsey
• Offline Level-1 trigger
• Trigger primitives S. Baffioni
• Offline/Commissioning calibration and alignement
• Overall to be defined
• Alignment Brian Heltsey
• Transparency correction (laser) to defined
• Offline Analysis tools
• Requested
• Physics JetMet
• Requested

29
Conclusions

• 2006 has been a fundamental year for the ECAL
  project
• 10 SM have been intercalibrated with the beam
• All integrated SM undergo to cosmic calibration
• DAQ DQM integrated and tested in different
  setups
• First validation of CMSSW Offline software DB
  achieved
• 2007
• solid base to start from but refinement/completion
  work is needed in many areas
• Primary goals
• Prepare everything for commissioning
• Deliver a full coherent picture for
  calibration/corrections
• Italian community plays an important role inside
  ECAL DPG covering many aspects/tasks