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ATLAS Muon Detector Description – sviluppi nell’ultimo anno

ATLAS Muon Detector Description – sviluppi nell’ultimo anno . MuonGeoModel: sw che descrive la geometria dello spettrometro a muoni di ATLAS nel framework offline generale dell’esperimento implementato a Lecce a partire dal 2003 condiviso da simulazione e ricostruzione

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ATLAS Muon Detector Description – sviluppi nell’ultimo anno

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  1. ATLAS Muon Detector Description – sviluppi nell’ultimo anno • MuonGeoModel:sw che descrive la geometria dello spettrometro a muoni di ATLAS nel framework offline generale dell’esperimento • implementato a Lecce a partire dal 2003 condiviso da simulazione e ricostruzione • S.Spagnolo and L.Chevalier Muon Detector Description task leaders da Sett. 2007 condition DB Il tool di allineamento fornisce run-time costanti che consentono di descrivere in MuonGeoModel spostamenti, rotazioni e deformazioni delle camere GOAL : 30-40mm risoluzione dell’allineamento globale alignment Tool event display geometry DB

  2. Lo spettrometro a muoni di ATLAS display del barrel 1700 alignable detector stations, ~1200 MDT chambers consisting of two arrays of staggered aluminium drift tubes, 1-6 m long, 3 cm diameter, 400 mm thin Al wall, ~1000 RPC units ~1500 TGC units 32 CSC chambers complex inert materials (barrel toroid coils, ec toroids, feet, support structures, shielding materials, calorimeter saddle)

  3. Nuova versione della Geometria • Il confronto con i dati (cosmici) forza a migliorare il realismo della descrizione della geometria • ATLAS-GEO-00-00-00 • Moving from Layout R in tech. drawings to the MS layout as installed (amdb version R03) • Active Geometry: • MDT HV-RO side checked and fixed for a few chambers • station positions fixed for a few stations • RPC layout in Small Sectors + RPC positioning in the stations with single RPC units + RPC chambers with cutouts + RPC special chambers heavily revisited • CSC position fixed (layer 2 installed not layer 1) • Dead Matter: • In the XML description: fixes to MDT Big Wheel, Calorimeter Saddle, TGC support; pos. of ID Patch Panels PP2; Muon Barrel + sect. 13) Access Platforms, Feet Struts, pos., BOL Support, Tie road, ECT cryostat fix • Status of R03: ready for production / currently in validation

  4. RPC layout in R03 As shown also from hit residuals studies with cosmic ray data, the RPC layout in the small sectors does not correspond to the nominal layout see B. Liberti et al http://indico.cern.ch/getFile.py/access?contribId=0&resId=0&materialId=slides&confId=32282 ATLAS-CSC-01-00-00 ATLAS-GEO-00-00-00 Layout as installed Nominal Layout

  5. RPC layout in R03 BOG as an example of chamber with single RPC unit: in some cases inverted position of gas gaps and thick support panel • changed w.r.t. R01 in • position in the station • # of eta strips • cutouts s3 RPC chambers s2 RPC chambers BMS5 BMS2A/CX BMS4 BMS3A/CX BMS6 BMS4A/CX

  6. Riorganizzazione del decoding dei dati Il caso RPC: struttura dei dati online molto diversa dalla struttura dei dati offline • h.w. duplicated hits due to cabling overlap • s.w. duplicated hits due to wired-or and logical-or • 3 types of trigger hits in the readout Al Filtro (ultimo passo del trigger di alto livello), l’algoritmo di muon-identification deve accedere solo ad una frazione dei dati (nella regione di interesse) per ridurre il tempo richiesto per la decodifica dei dati e minimizzare la combinatoria nel track finding

  7. La proposta RPC HLT applications or offline selective mode LIST OF data collection IDENTIFIERS Offline event dump mode overall data request – empty list RDO to PRD Tool new • allows to share logic (and implementation) between HLT and offline LIST OF PAD’S new • avanzata da Lecce • adottata da tutti i sottorivelatori del MS • in funzione per la prima release destinata • alla presa dati TRANSIENT EVENT STORE Bytestream ® RDO standard Converter RDO Data clean-up existing logic PRD

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