CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 1 ECA Barrel ECC

CSN1, 14 maggio 2007 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 He contact gas, circulation of liquid N2 in heat exchangers Purging of He gas, introduction of Ar gas in cold tank Last part of cool down: Ar contact gas, liquid N2 circulating in heat exchangers

CSN1, 14 maggio 2007 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

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 4

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 5

CSN1, 14 maggio 2007 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

CSN1, 14 maggio 2007 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

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 8 HV status Two old problems: 1. Failures of Iseg HV modules 2. 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

CSN1, 14 maggio 2007 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 Mregion (few hundreds k 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)

CSN1, 14 maggio 2007 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

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 11

CSN1, 14 maggio 2007 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

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 13 LV PS 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

CSN1, 14 maggio 2007 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 april 07 Physics analyses: H->analysis (CSC note: L. Carminati co-convener) A/H-> (CSC note: S. Resconi co-convener)

Additional Slides

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 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

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 17 M&O ATLAS LAr 2007 Piano di spesa (K CHF) : 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. le cifre relative agli anni sono oggi superate !!

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS M&O Sharing

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 19 CORE % M&OSpares FE Totale (KCHF) INFN (Milano) La riga che riguarda l’INFN (Milano) e’:

Meccanica5 Acquisti/Lavoraz. meccanic., saldature….. Impianti Gas1 Affitto bombole e racks Sist. Criogenici30 Manten. sist. Crio., gas x tests, slow control Sist. Cooling30 Coolling PS, FE crates, mantenim., upgrades Elettronica160 Strumentaz per laboratori, affitto pool, RO, manuten., upgrades Contr. DCS,DSS30 Componenti per ELMBs, sensori, sniffers PS(LV,HV)200 Manutenzione, upgrades Magazzino50 Componenti meccanici, elettrici, etc… Gestione Aree30 Trasporti,logistica, pulizia aree sperim. Comunicazioni4 Telefoni portatili, videoconferenze Manpower280 Personale tecnico,ingegn. esterno/gruppi Elettronica FE350 Spares, rimborso Totale1170 kCHF M&O Voci di Spesa 2007

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 21 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 ATLAS Italia LAr Electronic Coordinator Responsabile locale Composizione del Gruppo

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 22 Richieste Finanziarie 2007 Missioni interne 1. K€ x resp. naz 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 K€ ( criterio di “sharing” non ancora definito in ATLAS ).

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 23 Richieste Finanziarie 2007 Missioni interne 1. K€ x resp. naz 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 K€ ( criterio di “sharing” non ancora definito in ATLAS ).

CSN1, 14 maggio 2007 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: ( ) ppm O2 Stable in time !

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 25 ‘OR’ of top modules EBC LBC EBC LBC LBA EBA 5678 ‘OR’ of bottom modules 4 new boards from LAr 1234 ‘AND’ top - bottom 4 boards from Tile

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 26 March 2007 HV = 1.6 kV August 2006 (13k evts) 2. 0 kV October 2006 (78k evts) 1.6 kV

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 27 Some starting studies: Uniformity of response by P.S. Mangeard (old runs) η Normalized Muon Response S2 cell depth data normalized to 1 Muon energy deposited in LAr by M.Cooke Optimizing clustering algorithm follows expectations  Error bar per point is ~2 % in average (1% around  =0.4 and 3% at borders)

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 28 subdetectorall r=retrofitted o=old hc=high current EMB +SP EMB -PS HEC + Pur EMECEMEC-PS + Pur-N FCALHospital barrel Hospital end-caps Needed Total hc CERN order SUNNY order Total order sacrificed (cleaning/epoxy ) - 5 new piggy+ 2 total produced hc ordered in operation USA15 racks just arrived at CERN to be repaired 77r + 2o hc 39r +2o38r3122 7r+16r1r1 to be retrofitted as of today done still to be retrofitted r r r 4 at CERN at ISEG at TU-Dresden at PROTVINO SUM= hc hc r hc ordered

CSN1, 14 maggio 2007 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 x=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)

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 30 LAr Cosmic Run: 600 V region Most of the “short” > 1 M  <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 Signal is observed with ~30 % longer drift time Signal in 1600 V region Signal in 600 V region

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 31 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. 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, Nota CSC H 

CSN1, 14 maggio 2007 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

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 33 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 CSC Note HG7 : H°/A°   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 Editors: M. Heldmann, S. Resconi, Italian contributors: D. Cavalli

CSN1, 14 maggio 2007 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

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 35 Photons Resolution (/E), All E Crack Barrel- Endcap PS NO PS 25 GeV 50 GeV 75 GeV 100 GeV 200 GeV 500 GeV

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 36 Photons Linearity, All Energies Crack Barrel- Endcap PS NO PS 25 GeV 50 GeV 75 GeV 100 GeV 200 GeV 500 GeV

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 37 Electron Energy Resolution (/E), All Energies Crack Barrel-Endcap PS No PS Crack Barrel-EndCap 25 GeV 50 GeV 75 GeV 100 GeV 200 GeV 500 GeV

CSN1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 38 Electrons Linearity, All Energies Crack Barrel- Endcap PS NO PS 25 GeV 50 GeV 75 GeV 100 GeV 200 GeV 500 GeV