Calorimetria EM a LAr di ATLAS ECA Barrel

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

Detector Status n Barrel: n n He contact gas, circulation of liquid N 2 in heat exchangers Purging of He gas, introduction of Ar gas in cold tank Endcap A (ECA): n n Cold and filled with Lar. In stable conditions since June 06 He contact gas, circulation of gaseous N 2 in heat exchangers Cold and filled with Lar. In stable conditions since mid March 07 Last part of cool down: Ar contact gas, liquid N 2 circulating in heat exchangers Endcap C (ECC): n Cool down started on March 22 and should be finished by the beginning of June CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 2

Detector Status n Lots of debugging going on on the systems: n n Cosmic runs with Tile trigger: n n Noise studies, electronic calibration, signal reconstruction, … 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 CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 3

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HV DCS n Barrel and Presampler calorimeters HV DCS are partly integrated into the ATLAS DCS: n n Full integration expected before M 3 week (June 4 -18) Complete barrel integration and then move to endcap calorimeters: n n FSM: barrel only so far Condition DB: barrel only so far Configuration DB: to be done Alerts: to be done CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 6

HV status n n Due to limited availability of HV power supplies only a subset of the detector can be powered Barrel: n Barrel EM: n n Barrel Presampler: n n 1. 6 k. V on 12/32 modules (cosmic set-up) since begin of March 07 2000 V on 32/64 modules Endcap A: n EM: n n Hadronic: n n At nominal voltage since end of April 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 n Endcap C: n EM: n Partial 50 V during cool down CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 7

HV status Two old problems: n Failures of Iseg HV modules Shorts in some calorimeter sectors 1. 2. 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). n n n 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 CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 8

HV status 2. Shorts in the calorimeter: n Since the first cold tests in B 180, some HV sectors have been found in short n Two approaches to cure the shorts (Barrel EM, Barrel PS, EM Endcap): n n “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 m. A) at reduced voltage (if needed) CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 9

Shorts in calorimeter n Barrel Presampler: n n Barrel EM: n n n All channel OK at nominal voltage after “burning” procedure 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: n n 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 CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 10

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LV Power Supplies n 58 (Barrel+Endcaps) DC-DC converters located on the cryostats: n n Several problems found during production: n n n 280 V DC input, 4. 5 k. W per box, rad tol 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: n n Each unit has 27 module: 20 components/module to be replaced Job assigned to ALGEN Design Services Inc CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 12

LV PS n After an initial delay, retrofitting is now well on going and retrofitted modules are getting at CERN: n n 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): n Because of time and component availability not all desidered changed could be integrated CSN 1, 14 maggio 2007 n Two new companies identified to start a new design/prototyping phases: n n n Wiener Algen+AEI Decision for production will be taken after the prototype phase Calorimetria EM a LAr di ATLAS 13

SW activities n Calibration activities: n Calibration of photons and electrons n n n “Calibration hits” methods, will be available in release 13 Work on going to demonstrate if it can also be used in Etmiss calibration: n Overall performance (CSC note: D. Cavalli co-conv): n Hadronic calibration workshop held in Milano 26 -27 april 07 n Physics analyses: n n H->gg analysis (CSC note: L. Carminati co-convener) A/H-> (CSC note: S. Resconi co-convener) CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 14

Additional Slides CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS

Richieste Finanziarie n Missioni Italiane ed Estere: Integrazione MI, ME n 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 ) n Capitolo Consumo - Sblocco s j 40 Keur (M&O 56 Kfr CH + cong. ) 2007 CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 16

M&O ATLAS LAr 2007 Piano di spesa (K CHF) : 2006 2007 2008 2009 2010 750 1170 1285 le cifre relative agli anni 2008 superate !! 2010 sono oggi 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. CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 17

2007 M&O Sharing CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 18

La riga che riguarda l’INFN (Milano) e’: INFN CORE % M&O Spares FE Totale (KCHF) 4. 8 39. 4 16. 8 56 (Milano) CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 19

M&O Voci di Spesa 2007 Meccanica 5 Acquisti/Lavoraz. meccanic. , saldature…. . Impianti Gas 1 Affitto bombole e racks Sist. Criogenici 30 Manten. sist. Crio. , gas x tests, slow control Sist. Cooling 30 Coolling PS, FE crates, mantenim. , upgrades Elettronica 160 Strumentaz per laboratori, affitto pool, RO, manuten. , upgrades Contr. DCS, DSS 30 Componenti per ELMBs, sensori, sniffers PS(LV, HV) 200 Manutenzione, upgrades Magazzino 50 Componenti meccanici, elettrici, etc… Gestione Aree 30 Trasporti, logistica, pulizia aree sperim. Comunicazioni 4 Telefoni portatili, videoconferenze Manpower 280 Personale tecnico, ingegn. esterno/gruppi Elettronica FE 350 Spares, rimborso Totale 1170 k. CHF

Composizione del Gruppo n n Ricercatori : n D. Banfi (Dottorando, 100%) n L. Carminati (Ass. Uni. , 100%) n D. Cavalli (Dir. Ric. , 100%) n G. Costa (Dir. Ric. , 100%) n M. Fanti (Ric. Uni. , 100%) n L. Mandelli (PO, 100%) n L. Perini (PO, 100%) n S. Resconi (art. 23, 0 %) n F. Tartarelli ( Ric. , 100%) Tecnologi: n M. Citterio ( Tec. , 50. %) Totale: 8 Ricercatori, 2 Tecnologi→ ( 8. 5 FTE ) Coordinatrice WG Jet, t e PTmiss Perf. Responsabile locale Responsabile ATLAS Italia LAr Electronic Coordinator Tecnici: n B. Monticelli (100%), F. Alberti (50 %) - Servizio Elettronica ( 8 mu) CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 21

Richieste Finanziarie 2007 n n Missioni interne 1. K€ x 8. 5 +3 resp. naz. Missioni Estere n Meetings etc. 8. 5 x 1. 5= 12. 8 mux 4. 4 K€ n Integraz. Responsabilita’ 3 x 4. 4 K€ n Commissioning HV 2 p x 12 w → 6 X 4. 4 K€ Totale mesi uomo : 21. 8 mu n 11. 5 K€ Totale Missioni Est. per gestione app. + shifts LAr /ATLAS - 07) (*) assumendo 1. 5 FTE/y (18 mesi uomo) n n 56. 1 13. 2 26. 4 ____ 95. 7 K€ 79. 2 K€ Consumi Metabolismo (1. 5 K€x 8. 5) M+O (2007) 56 KFr. CH 12. 8 K€ 37. 3 K€ Programma R&D SLHC ( Si. Ge) (se approvato) 30. (*) E’ solo una valutazione preliminare !! Totale ( criterio di “sharing” non ancora definito in ATLAS ). CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS K€ 266. 5 K€ 22

Richieste Finanziarie 2007 n n Missioni interne 1. K€ x 8. 5 +3 resp. naz. Missioni Estere n Meetings etc. 8. 5 x 1. 5= 12. 8 mux 4. 4 K€ n Integraz. Responsabilita’ 3 x 4. 4 K€ n Commissioning HV 2 p x 12 w → 6 X 4. 4 K€ Totale mesi uomo : 21. 8 mu n 11. 5 K€ Totale Missioni Est. per gestione app. + shifts LAr /ATLAS - 07) (*) assumendo 1. 5 FTE/y (18 mesi uomo) n n 56. 1 13. 2 26. 4 ____ 95. 7 K€ 79. 2 K€ Consumi Metabolismo (1. 5 K€x 8. 5) M+O (2007) 56 KFr. CH 12. 8 K€ 37. 3 K€ Programma R&D SLHC ( Si. Ge) (se approvato) 30. (*) E’ solo una valutazione preliminare !! Totale ( criterio di “sharing” non ancora definito in ATLAS ). CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS K€ 266. 5 K€ 23

Barrel • Pressure variations in expansion vessel: ± 4 mbar; • Temperature variations (in time) in liquid argon (as measured by DCS): < 20 m. K; (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 O 2 Stable in time ! CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 24

4 boards from Tile 1 2 3 4 EBC LBA ‘OR’ of top modules EBA ‘AND’ top - bottom EBC 4 new boards from LAr CSN 1, 14 maggio 2007 LBC 5 6 7 8 LBA EBA ‘OR’ of bottom modules Calorimetria EM a LAr di ATLAS 25

March 2007 HV = 1. 6 k. V October 2006 (78 k evts) 1. 6 k. V August 2006 (13 k evts) 2. 0 k. V CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 26

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 =0. 4 and 3% at borders) CSN 1, 14 maggio 2007 Normalized Muon Response Some starting studies: Calorimetria EM a LAr di ATLAS cell depth data S 2 normalized to 1 27 η

subdetector all r=retrofitted o=old hc=high current Needed Total CERN order SUNNY order Total order 151 + 6 hc EMB +SP EMB -PS 32+3 16 HEC + Pur EMEC-PS + Pur-N FCAL Hospital barrel 32+1 48 4+1 14 2 4 ordered 136 3 139 sacrificed (cleaning/epoxy ) -5 new piggy +2 total produced 136 + 2 hc 72 44 6 14 2 in operation USA 15 racks just arrived at CERN to be repaired 77 r + 2 o +15 + 2 hc 39 r +2 o 38 r 3 12 2 1 r 1 4 1 12 1 2 hc 1 6 1 14 to be retrofitted as of today done still to be retrofitted at CERN at ISEG at TU-Dresden at PROTVINO SUM= CSN 1, 14 maggio 2007 Hospital end-caps 7 r+1 6 r 1 r 1 r 114 86 r 28 70 46 r 24 44 40 r 4 103 + 2 hc 30 1 2 136 + 2 hc 48 24 39 4 1 r 72 44 Calorimetria EM a LAr di ATLAS ordered 2 hc 28

HV sectors n The calorimeter has a large HV granularity and the impact of HV failures is limited n n n In the Barrel EM there are 448 HV sectors; each HV sector is x f=0. 2 x 0. 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) CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 29

LAr Cosmic Run: 600 V region n Most of the “short” > 1 M n < 1 m. A at 1000 V -> <1 W dissipation. n reduced acceptance loss to x = 0. 075 x 0. 025 (or 0. 05) wrt x = 0. 2 x 0. 2 n the effect should be quite similar to a dead middle cell n. . . but lower signal-to-noise ratio due to 20% reduction of signal Detection of in the region with lower rate but no dead Signal is observed with region ~30 % longer drift time Signal in 1600 V region Signal in 600 V region CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 30

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. • • Studio e ottimizzazione della risoluzione del picco di massa dell’Higgs: • • • Messa a punto di un framework comune di lavoro in previsione dei primi dati 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. CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 31

CSC Et. Miss Overall Performance Note • Editors: D. Cavalli, A. Gupta, Italian contributors: C. Pizio, S. Resconi 3) Object-based method 1) Introduction 2) The Cell-based method * Etmiss reconstruction (Noise suppression ) * Etmiss calibration (H 1 -calibration, Local. Hadron. Calibration, Refined calibration a la TDR) * Evaluation of Performance: resolution, linearity, tails * measurement of Etmiss direction 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 20 Mevts 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 CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 32

CSC Note HG 7 : H°/A° • Editors: M. Heldmann, S. Resconi, Italian contributors: D. Cavalli • Introduction: • Importance of the channel (experimentally and theoretically) • Previous studies (TDR and after) • For each one of the 3 final decay modes (lep-had, had-had, lep-lep): • Event selection • data carachteristics • MSSM H/A Production and Crosssections • Analysis • Montecarlo (PHYTIA + SHERPA) • Results • Experimental setup • Systematic uncertainties • Detector requirements: • Trigger • Tau reco and id: • Combine the results from • Electron reconstruction the 3 decay-modes : • Muon reconstruction • Et. Miss reco and calib: • CSN 1, jet rec, calib and b-tagging 14 maggio 2007 • Discovery curve in the (m. A, tanbeta) plane • Summary and conclusions • Acknowledgments, References, Appendices: Technical Aspects Calorimetria EM a LAr di ATLAS 33

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 CSN 1, 14 maggio 2007 Calorimetria EM a LAr di ATLAS 34

Photons Resolution (s/E), All E CSN 1, 14 maggio 2007 25 Ge. V 50 Ge. V 75 Ge. V 100 Ge. V 200 Ge. V 500 Ge. V PS NO PS Crack Barrel. Endcap • • • Calorimetria EM a LAr di ATLAS 35

Photons Linearity, All Energies CSN 1, 14 maggio 2007 25 Ge. V 50 Ge. V 75 Ge. V 100 Ge. V 200 Ge. V 500 Ge. V PS NO PS Crack Barrel. Endcap • • • Calorimetria EM a LAr di ATLAS 36

• • • 25 Ge. V 50 Ge. V 75 Ge. V 100 Ge. V 200 Ge. V 500 Ge. V CSN 1, 14 maggio 2007 Crack Barrel-End. Cap Barrel-Endcap Electron Energy Resolution (s/E), All Energies PS Calorimetria EM a LAr di ATLAS No PS 37

Electrons Linearity, All Energies CSN 1, 14 maggio 2007 25 Ge. V 50 Ge. V 75 Ge. V 100 Ge. V 200 Ge. V 500 Ge. V PS NO PS Crack Barrel. Endcap • • • Calorimetria EM a LAr di ATLAS 38