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Calorimetria EM a LAr di ATLAS

Calorimetria EM a LAr di ATLAS. ECA. ECC. Barrel. Detector Status. Barrel: Cold and filled with Lar. In stable conditions since June 06 Endcap A (ECA): Cold and filled with Lar. In stable conditions since mid March 07 Endcap C (ECC):

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Calorimetria EM a LAr di ATLAS

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  1. Calorimetria EM a LAr di ATLAS ECA ECC Barrel Calorimetria EM a LAr di ATLAS

  2. Detector Status • Barrel: • Cold and filled with Lar. In stable conditions since June 06 • Endcap A (ECA): • Cold and filled with Lar. In stable conditions since mid March 07 • Endcap C (ECC): • Cool down started on March 22 and should be finished by the beginning of June He contact gas, circulation of gaseous N2 in heat exchangers Purging of He gas, introduction of Ar gas in cold tank He contact gas, circulation of liquid N2 in heat exchangers Last part of cool down: Ar contact gas, liquid N2 circulating in heat exchangers Calorimetria EM a LAr di ATLAS

  3. Detector Status • Lots of debugging going on on the systems: • Noise studies, electronic calibration, signal reconstruction,… • Cosmic runs with Tile trigger: • Barrel: first data taking period in August 06 and October 06. Now systematically (~every weekend) since March 07 • ECA: taking combined data (ECA+Barrel+Tile) since Easter • Cosmic run is being proving a great opportunity to drive developments in DCS, DAQ, Monitoring, Reconstruction, Electronics Calibration, conditions DB,… • Strong Milano involvement on HV activity and especially on DCS software Calorimetria EM a LAr di ATLAS

  4. Calorimetria EM a LAr di ATLAS

  5. Calorimetria EM a LAr di ATLAS

  6. HV DCS • Barrel and Presampler calorimeters HV DCS are partly integrated into the ATLAS DCS: • Full integration expected before M3 week (June 4-18) • Complete barrel integration and then move to endcap calorimeters: • FSM: barrel only so far • Condition DB: barrel only so far • Configuration DB: to be done • Alerts: to be done Calorimetria EM a LAr di ATLAS

  7. HV status • Due to limited availability of HV power supplies only a subset of the detector can be powered • Barrel: • Barrel EM: • 1.6 kV on 12/32 modules (cosmic set-up) since begin of March 07 • Barrel Presampler: • 2000 V on 32/64 modules • Endcap A: • EM: • At nominal voltage since end of April • Hadronic: • At nominal voltage since beginning of April. Temporarily OFF to debug HV/LV interlock for safety of HEC preamps • Forward: At nominal voltage since beginning of April • Endcap C: • EM: • Partial 50 V during cool down Calorimetria EM a LAr di ATLAS

  8. HV status • Two old problems: • Failures of Iseg HV modules • Shorts in some calorimeter sectors 1. Failures of Iseg modules: • Solved. The problem has been identified and Iseg is retrofitting all modules bought by the Collaboration (136/151) • Retrofitting: 75% done (of 114 which need retrofitting). Should be finished by Mid June. • 40 “new generation” modules ordered: 15 to complete set-up (end August) + spares (end 2007-beginning 2008). • Prototypes being delivered: to be tested at CERN, Dresden and Milano before starting production • Retrofitted modules are continuously ON since beginning March (April) for Barrel (ECA) cosmic runs with good performance Calorimetria EM a LAr di ATLAS

  9. HV status 2. Shorts in the calorimeter: • Since the first cold tests in B180, some HV sectors have been found in short • Two approaches to cure the shorts (Barrel EM, Barrel PS, EM Endcap): • “short burning”: send a fast large spike in the faulty HV line to burn the resistive impurity causing the short cut • “hospitalization” (if the above fails): since the “short” has usually a resistance in the ~1 MW region (few hundreds kW in worst cases), the affected channel can be put on special high current modules where they can operated drawing currents (up to 3 mA) at reduced voltage (if needed) Calorimetria EM a LAr di ATLAS

  10. Shorts in calorimeter • Barrel Presampler: • All channel OK at nominal voltage after “burning” procedure • Barrel EM: • Burning tried beginning of July: unsuccessfull • 23/896 lines on high current modules • 12/23 lines operated drawing current at nominal or reduced voltage since beginning of March (cosmic set-up) • Affected sectors can be operated successfully, currents are pretty stable • Endcap EM A: • 27 lines in shorts during first ramp up after cool down • Short burning: 16/27 lines cured • Remaining 11 lines will be put on high current modules (modules ordered) • All the other lines OK at nominal voltages Calorimetria EM a LAr di ATLAS

  11. Calorimetria EM a LAr di ATLAS

  12. LV Power Supplies • 58 (Barrel+Endcaps) DC-DC converters located on the cryostats: • 280 V DC input, 4.5 kW per box, rad tol • Several problems found during production: • Weak design and construction, thermal problems, deterioration of components • Only 12 PS available for cosmic run so far • After a deep re-evaluation of the design the Collaboration decided to retrofit all 68 units: • Each unit has 27 module: 20 components/module to be replaced • Job assigned to ALGEN Design Services Inc Calorimetria EM a LAr di ATLAS

  13. After an initial delay, retrofitting is now well on going and retrofitted modules are getting at CERN: 23 done, 16 already at CERN (2 on Barrel replacing old ones, 7 on ECA) OK so far: 2 PS ON for about 2 weeks Retrofitting will be completed by late July However it is only a temporary solution (2 yrs): Because of time and component availability not all desidered changed could be integrated Two new companies identified to start a new design/prototyping phases: Wiener Algen+AEI Decision for production will be taken after the prototype phase LV PS Calorimetria EM a LAr di ATLAS

  14. SW activities • Calibration activities: • Calibration of photons and electrons • “Calibration hits” methods, will be available in release 13 • Work on going to demonstrate if it can also be used in Etmiss calibration • Etmiss calibration: • Overall performance (CSC note: D. Cavalli co-conv): • Hadronic calibration workshop held in Milano 26-27 april 07 • Physics analyses: • H->gg analysis (CSC note: L. Carminati co-convener) • A/H->tt (CSC note: S. Resconi co-convener) Calorimetria EM a LAr di ATLAS

  15. Additional Slides

  16. Richieste Finanziarie • Missioni Italiane ed Estere: Integrazione MI, ME • Marcello Mazzanti e’ in pensione dal settembre 2006, era stato cancellato, dal 1 ° gennaio 07 e’ associato senior. - successivamente integrazione missioni estere sulla base delle necessita’ ( per 2007: proposti 132 keur, finanziati 92.5 ) • Capitolo Consumo - Sblocco s j 40 Keur (M&O 56 Kfr CH + cong.) 2007 Calorimetria EM a LAr di ATLAS

  17. M&O ATLAS LAr 2007 Piano di spesa (K CHF) : le cifre relative agli anni 2008 2010 sono oggi superate !! Nel 2007 per LAr non ci sono piu’ C&I e CC. L’incremento nel 2007 rispetto al 2006, risente del rimborso di 350 KCHF per “spares “ (elettronica di FE), gia’ da tempo programmato. La prima valutazione dei costi M&O per il 2007 ( maggio 06) e’ stata ridotta del ~ 14 %, per tener conto della nuova schedula di LHC. Calorimetria EM a LAr di ATLAS

  18. 2007 M&O Sharing Calorimetria EM a LAr di ATLAS

  19. La riga che riguarda l’INFN (Milano) e’: Calorimetria EM a LAr di ATLAS

  20. M&O Voci di Spesa 2007

  21. Composizione del Gruppo • Ricercatori : • D. Banfi (Dottorando, 100%) • L. Carminati (Ass. Uni., 100%) • D. Cavalli (Dir. Ric., 100%) • G. Costa (Dir. Ric., 100%) • M. Fanti (Ric. Uni., 100%) • L. Mandelli (PO, 100%) • L. Perini (PO, 100%) • S. Resconi (art. 23, 0 %) • F. Tartarelli ( Ric., 100%) • Tecnologi: • M. Citterio ( Tec., 50.%) • Totale: 8 Ricercatori, 2 Tecnologi→ ( 8.5 FTE ) • Tecnici: • B.Monticelli (100%), F.Alberti (50 %) - Servizio Elettronica ( 8mu) Coordinatrice WG Jet, t e PTmiss Perf. Responsabile locale Responsabile ATLAS Italia LAr Electronic Coordinator Calorimetria EM a LAr di ATLAS

  22. Richieste Finanziarie2007 Missioni interne 1. K€ x8.5 +3 resp. naz. 11.5 K€ Missioni Estere Meetings etc. 8.5 x 1.5= 12.8 mux 4.4 K€ 56.1 Integraz. Responsabilita’ 3 x 4.4 K€ 13.2 Commissioning HV 2p x 12w →6X4.4 K€ 26.4 ____ Totale mesi uomo :21.8 mu Totale 95.7 K€ Missioni Est. per gestione app.+ shifts LAr /ATLAS - 07) (*) assumendo 1.5 FTE/y (18 mesi uomo) 79.2 K€ Consumi Metabolismo (1.5 K€x8.5) 12.8 K€ M+O (2007) 56 KFrCH 37.3 K€ Programma R&D SLHC ( SiGe) (se approvato) 30. K€ (*) E’ solo una valutazione preliminare !! Totale 266.5 K€ ( criterio di “sharing” non ancora definito in ATLAS ). Calorimetria EM a LAr di ATLAS

  23. Richieste Finanziarie2007 Missioni interne 1. K€ x8.5 +3 resp. naz. 11.5 K€ Missioni Estere Meetings etc. 8.5 x 1.5= 12.8 mux 4.4 K€ 56.1 Integraz. Responsabilita’ 3 x 4.4 K€ 13.2 Commissioning HV 2p x 12w →6X4.4 K€ 26.4 ____ Totale mesi uomo :21.8 mu Totale 95.7 K€ Missioni Est. per gestione app.+ shifts LAr /ATLAS - 07) (*) assumendo 1.5 FTE/y (18 mesi uomo) 79.2 K€ Consumi Metabolismo (1.5 K€x8.5) 12.8 K€ M+O (2007) 56 KFrCH 37.3 K€ Programma R&D SLHC ( SiGe) (se approvato) 30. K€ (*) E’ solo una valutazione preliminare !! Totale 266.5 K€ ( criterio di “sharing” non ancora definito in ATLAS ). Calorimetria EM a LAr di ATLAS

  24. Barrel • Pressure variations in expansion vessel: ± 4 mbar; • Temperature variations (in time) in liquid argon (as measured by DCS): < 20 mK; (Tmin 88.2 K, Tmax 88.6 K) • Running on “lost” nitrogen (losses too small to run with refrigerator) • Impurity level measured with four purity cells: (0.20 +- 0.05) ppm O2 Stable in time ! Calorimetria EM a LAr di ATLAS

  25. 4 boards from Tile 1 2 3 4 ‘OR’ of top modules ‘AND’ top - bottom 4 new boards from LAr ‘OR’ of bottom modules EBC LBC LBA EBA 5 6 7 8 EBC LBC LBA EBA Calorimetria EM a LAr di ATLAS

  26. March 2007 HV = 1.6 kV October 2006 (78k evts) 1.6 kV August 2006 (13k evts) 2. 0 kV Calorimetria EM a LAr di ATLAS

  27. S2celldepth data Normalized Muon Response normalized to 1 η Some starting studies: Muon energy deposited in LAr by M.Cooke Optimizing clustering algorithm Uniformity of response by P.S. Mangeard (old runs) • follows expectations •  Error bar per point is ~2 % in average (1% around h=0.4 and 3% at borders) Calorimetria EM a LAr di ATLAS

  28. Calorimetria EM a LAr di ATLAS

  29. HV sectors • The calorimeter has a large HV granularity and the impact of HV failures is limited • In the Barrel EM there are 448 HV sectors; each HV sector is DhxDf=0.2x0.2 (2‰) and biased by 2 lines, each one providing HV to a set of 32 semigaps of LAr • If one line fails a reduced signal is seen that can be corrected offline • No dead zones (holes) Calorimetria EM a LAr di ATLAS

  30. Signal is observed with ~30 % longer drift time Signal in 1600 V region Signal in 600 V region LAr Cosmic Run: 600 V region • Most of the “short” > 1 M • < 1 mA at 1000 V -> <1 W dissipation. • reduced acceptance loss to x = 0.075x0.025 (or 0.05) wrt x = 0.2x0.2 • the effect should be quite similar to a dead middle cell • ... but lower signal-to-noise ratio due to 20% reduction of signal Detection of  in the region with lower rate but no dead region Calorimetria EM a LAr di ATLAS

  31. Nota CSC H • EDITORS: L. Carminati (Milano), B. Mellado (Wisconsin) • GRUPPI COINVOLTI: Annecy(France), CERN, Milano(Italy), Montreal (Canada), Orsay, Paris (France), SMU(US), Wisconsin (US) • ORGANIZZAZIONE: lavoro incominciato nell’autunno 2006, Linee di lavoro: • Validazione software, formati e tools di analisi. • Messa a punto di un framework comune di lavoro in previsione dei primi dati • Studio e ottimizzazione della risoluzione del picco di massa dell’Higgs: • calibrazione dei fotoni, ricostruzione del vertice primario, conversioni…) • Fondo riducibile: studio e ottimizzazione dei “fake jets” in collaborazione con e/gamma performance groups • Fondo irriducibile: studio di tool statistici per ottimizzare l’estrazione del segnale sul fondo irriducibile. Calorimetria EM a LAr di ATLAS

  32. CSC EtMiss Overall Performance Note • Editors: D. Cavalli, A. Gupta, Italian contributors: C. Pizio, S. Resconi 1) Introduction 2) The Cell-based method * Etmiss reconstruction (Noise suppression ) * Etmiss calibration (H1-calibration, LocalHadronCalibration, Refined calibration a la TDR) * Evaluation of Performance: resolution, linearity, tails * measurement of Etmiss direction 3) Object-based method 4) Fake Etmiss dedicated studies * Fake Etmiss sources ( jets pointing to cracks, losses in dead materials,...) * Beam-halo, beam-gas, cavern background effects * Instrumental effects (noisy/hot/dead cells (regions) in calorimeters * Etmiss significance 5) Etmiss in Atlfast 6) Etmiss in early data * resolution in minimum bias events * Etmiss scale from Z to tau-tau event * W-->l-nu events * W+jets events 7) Summary and conclusions • CSC (Computer System Challenge) • Simulazione MC – detector as built-as installed-with misallignements • Produzione di 20Mevts in corso • Testare la catena completa del computing • Produzione, distribuzione, analisi dati • Produrre CSC note che documentano la Performance del rivelatore • Potenzialita’ nello studio dei canali di fisica Calorimetria EM a LAr di ATLAS

  33. CSC Note HG7 : H°/A°   • Editors: M. Heldmann, S. Resconi, Italian contributors: D. Cavalli • For each one of the 3 final decay modes • (lep-had, had-had, lep-lep): • Event selection • data carachteristics • Analysis • Results • Systematic uncertainties • Trigger • Combine the results from • the 3 decay-modes : • Discovery curve in the (mA, tanbeta) plane • Summary and conclusions • Acknowledgments, References, Appendices: Technical Aspects • Introduction: • Importance of the channel (experimentally and theoretically) • Previous studies (TDR and after) • MSSM H/A Production and Cross-sections • Montecarlo (PHYTIA + SHERPA) • Experimental setup • Detector requirements: • Tau reco and id: • Electron reconstruction • Muon reconstruction • EtMiss reco and calib: • jet rec, calib and b-tagging Calorimetria EM a LAr di ATLAS

  34. Calibrazione elettromagnetica : ‘first principles based calibration’ • La calibrazione elettromagnetica attuale e’ basata su • coefficienti estratti con una procedura di minimizzazione. • CONS: Non e’ possibile fattorizzare le correzioni e I pesi longitudinali non correggono esattamente per l’effetto • PRO: Performance accettabili e metodo semplice • E’ stato sviluppato un metodo di calibrazione alternativo alla minimizzazione e basato su speciali simulazioni con accesso alle energie depositate anche nei materiali inattivi/passivi del rivelatore • PRO: Disaccoppiare e capire le correzioni (materiale in fronte, leakage longitudinale…), correggere ogni singolo effetto con una correzione opportuna. • CONS: il metodo e’ piu’ complesso e sono richiesti piu’ parametri. • Lo studio del metodo e’ terminato ed e’ stato implementato dentro il software ufficiale di ricostruzione di ATLAS: • Studi e confronti dettagliati verranno effettuati tra i metodi anche nell’ambito del CDC Banfi,Carminati,Mandelli Calorimetria EM a LAr di ATLAS

  35. 25 GeV • 50 GeV • 75 GeV • 100 GeV • 200 GeV • 500 GeV NO PS PS Crack Barrel-Endcap Photons Resolution (s/E), All E Calorimetria EM a LAr di ATLAS

  36. 25 GeV • 50 GeV • 75 GeV • 100 GeV • 200 GeV • 500 GeV NO PS PS Crack Barrel-Endcap Photons Linearity, All Energies Calorimetria EM a LAr di ATLAS

  37. 25 GeV • 50 GeV • 75 GeV • 100 GeV • 200 GeV • 500 GeV PS No PS Crack Barrel-EndCap Crack Barrel-Endcap Electron Energy Resolution (s/E), All Energies Calorimetria EM a LAr di ATLAS

  38. 25 GeV • 50 GeV • 75 GeV • 100 GeV • 200 GeV • 500 GeV NO PS PS Crack Barrel-Endcap Electrons Linearity, All Energies Calorimetria EM a LAr di ATLAS

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