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ECAL DPG

ECAL DPG. P. Meridiani CMS Italia 13/02/2007. Outline. ECAL Achievements in the 2006 Task list & organization of the new ECAL DPG. Achievements in the 2006. From June 2006 ECAL community has been splitted into several experimental setups TB @ H4 (ECAL) TB @ H2 (ECAL + HCAL) Cosmic setup

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ECAL DPG

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  1. ECAL DPG P. Meridiani CMS Italia 13/02/2007 Paolo Meridiani - INFN Roma1

  2. Outline • ECAL Achievements in the 2006 • Task list & organization of the new ECAL DPG Paolo Meridiani - INFN Roma1

  3. Achievements in the 2006 • From June 2006 ECAL community has been splitted into several experimental setups • TB @ H4 (ECAL) • TB @ 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 Paolo Meridiani - INFN Roma1

  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 goal:Intercalibration (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 Paolo Meridiani - INFN Roma1

  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% @ 120 GeV A. Benaglia, P.Govoni, A. Martelli, M. Paganoni, D. Riparo, R. Salerno, V. Tancini Paolo Meridiani - INFN Roma1

  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 Paolo Meridiani - INFN Roma1

  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 3+5 weights Noise in ADC counts Preliminary Preliminary C. Rovelli Paolo Meridiani - INFN Roma1

  8. Tuning the MC • More effort has been put on MC validation/tuning/comparison 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 Paolo Meridiani - INFN Roma1

  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, particle’s 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 (%) Paolo Meridiani - INFN Roma1 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. Paolo Meridiani - INFN Roma1

  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 Paolo Meridiani - INFN Roma1

  12. ECAL intercalibration @ 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 @ 50 GeV ~ 2% • Still larger than expected. Before cal. ADC counts D. Del Re, R. Paramatti, S. Rahatlou Paolo Meridiani - INFN Roma1

  13. Combining ECAL+HCAL • On going work: optimization of the combined ECAL+HCAL 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 Paolo Meridiani - INFN Roma1

  14. 0 run @ 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 Paolo Meridiani - INFN Roma1 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 Paolo Meridiani - INFN Roma1

  16. ECAL @ MTCC • 2 SMs at 11 o’clock • 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 Paolo Meridiani - INFN Roma1

  17. DAQ & Trigger • ECAL DAQ software system: • The ECAL DAQ software system has been used in H4, H2 (HCAL+ECAL) 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) Paolo Meridiani - INFN Roma1

  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 temperatures+currents, 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 Paolo Meridiani - INFN Roma1

  19. 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 Paolo Meridiani - INFN Roma1

  20. An example of a H4 DQM page F. Cossutti, G. Della Ricca, A. Ghezzi , B. Gobbo Paolo Meridiani - INFN Roma1

  21. 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 we’ll 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... Paolo Meridiani - INFN Roma1

  22. Laser Monitoring Stability 1.4 ‰ from gauss fit to peak. • 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. Long tail under study, but overall stability is satisfactory D APD/PN H2 testbeam: Black : APD/PN, averaged over 100 channels. Red : DT/20+1 Paolo Meridiani - INFN Roma1

  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 Paolo Meridiani - INFN Roma1

  24. 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 Paolo Meridiani - INFN Roma1

  25. Tasks[2] • 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 Paolo Meridiani - INFN Roma1

  26. Tasks [3] • Preshower issues • Try to integrate the preshower aspects within the other categories • Event display • Global performance monitoring • alias offline DQM Paolo Meridiani - INFN Roma1

  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 Paolo Meridiani - INFN Roma1

  28. 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… Paolo Meridiani - INFN Roma1

  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 Paolo Meridiani - INFN Roma1

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