Transcript Slide 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 ascii file condition DB (*) tables(*) XML tables(**) amdb blob Id Dict. name Cabling Maps names geometry DB alignment Tool 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 event display Digitization Data Decoding Reconstruction Muonboy via Amdc 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) 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 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 Nominal Layout Layout as installed 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 s2 RPC chambers BMS5 BMS2A/CX BMS4 BMS3A/CX changed w.r.t. R01 in •position in the station •# of eta strips •cutouts s3 RPC chambers BMS6 BMS4A/CX 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 La proposta RPC HLT applications or offline selective mode LIST OF data collection IDENTIFIERS overall data request – empty list • allows to share logic (and implementation) between HLT and offline RDO to PRD Tool new LIST OF PAD’S new Bytestream RDO standard Converter Data clean-up existing logic Offline event dump mode TRANSIENT EVENT STORE RDO PRD •avanzata da Lecce •adottata da tutti i sottorivelatori del MS •in funzione per la prima release destinata alla presa dati