1、Atlantis tutorial,Hans Drevermann (CERN), Janice Drohan (UCL), Charles Timmermans (KUN),4 March 2004,ATLAS Software Week/CERN,Outline,Introduction Data visualization Hans Basic concepts (presentation) Janice Hands on demonstration of basic functionality User session- Coffee - Access to events Janice
2、 Advanced features (presentation) - Charles Hands on demonstration of advanced features Questions & answers,Atlantis goals,Primary visual investigation and physical understanding of complete Atlas events. Secondary help develop reconstruction and analysis algorithms debugging during commissioning pi
3、ctures and animations for publications, presentations and exhibitions event display for simple test-beams online event display,Data,The following data may currently be visualized by the program3D silicon points, silicon strip clusters and TRT straws Si Geant Hits, Trigger space points Simulated trac
4、ks, neutral particles and vertices Reconstructed tracks iPatRec, xKalman, IDScan Reconstructed secondary vertices LAr, TILE, HEC and FCAL calorimeter cells and clusters. MDT, RPC, TGC, CSC hits and CSC clusters Simulated and reconstructed muon tracks (MOORE) Associations (hit to track, cell to clust
5、er etc),Detector/Data oriented projections,3D Cartesian coordinates x,y,z are not always optimal for colliding beam experimentsMore natural and useful are the non-linear combinations which reflect the design of ATLASr = (x2+y2),f = atan2(y, x),h = log( z/r + (z/r)2+1) ,where x, y, z need to be sligh
6、tly modified to take into account the primary vertex of the underlying event (xvtx yvtx zvtx ) x = x-xvtx , y = y-yvtx , z = z-zvtx,Y/X projection TILE, LAr barrel, RPC (intuitive),RPC,f/r projection like Y/X, but prompt tracks are straight lines,r/Z projection calorimeters, muon hits (rsector) (int
7、uitive),X/Z projection muon hits and their association to Moore tracks,f/Z projection TRT and LAr endcaps, HEC, TGC phi strips,TRT,TGC,f/h projection and the V-Plot,f,h,r = rMax,r = 2 cm,V-Plot,Draw each space point twice atF,h+k*(r-rMax) and F,h-k*(r-rMax)3D informationFor tracks can judgefhpt (slo
8、pe of V arms)charge ( L -veV +ve),Distorted Vs track not from IP,low p, -ve,high p, +ve,f/h projection track to calorimeter associations (30 GeV electron),Pt=29.3 GeV E =31.2 GeV,LAr Presampler,LAr Layer 1,LAr Layer 2,LAr Layer 3,Island (guides eye),Track (enters LAr here),Cell geometry,Area a E,Use
9、r interface,Menu bar (IO,preferences,help),Window Control(zoom,copy, DnD),Commands,Output window,Parameter groups,Interaction Control,Parameters,Online help available for every component,Right click on component for online help (hyper-linked HTML),Hover for tool-tip help,Interactions,ZMR - zoom, mov
10、e and rotate w.r.t defined center Rubberband - selection and zooming Pick - pick and move to (selection and query) Fisheye - relative expansion of central region Clock - relative expansion of angular region Synchro-cursors - correlation between different projections Scale - copy scales between windo
11、ws,Mostly mouse driven with sometimes a modifier key pressed on the keyboard,Input Data,Atlantis is a JAVA applicationIt communicates with Athena via dedicated XML files produced by JiveXML ( see talk later)These files are best grouped and compressed inside zip filesSingle design luminosity event is
12、 approx 20 MB (XML)4 MB (zip),Detector Geometry,Used to convey quickly to the user the context in which hits are to be viewed. Idealized geometry is adequate and desirable. (e.g. LAr pre-sampler is only 1 cm thick and would be invisible if drawn as such Stored in two separate XML files. muon geometr
13、y derived from parameter book.,Printing,File = print = EPS, PNG, GIFEPS high quality vector graphics good for posters, publications(file size 200KB - 2MB)PNG compressed bitmapgood for ppt presentations + web(file size 20-50 KB),AtlFast,User defined geometry (e.g. MDT - cosmic test stand),Web page,ww
14、w.cern.ch/atlantisHow to download, install and run AtlantisPicture database (example event displays)Presentations,Contributors,Many people contributed to the development of Atlantis. In particular:Gary Taylor (UC Santa Cruz) Principal developer Hans Drevermann (CERN/EP) Original ideas, FORTRAN versi
15、on Dumitru Petrusca (Siegen/CERN) Initial work on GUI, calorimeters Jon Couchman (UCL) Athena algorithm (JiveXML) Frans Crijns (Nijmegen) Muon geometry Peter Klok (Nijmegen) Picture databaseCurrent Developers:Janice Drohan (UCL) Charles Timmermans (Nijmegen),Atlantis tutorial-2,Hans Drevermann (CERN
16、), Janice Drohan (UCL), Charles Timmermans (KUN),4 March 2004,ATLAS Software Week/CERN,Analysis Techniques,Data to be viewed may beCut - e.g. by pT, energy, associationColored - by associations , layer, sub-detectormore powerful when used in combinatione.g. selected only hits belonging to kine track
17、sand color them by their associated reconstructed track ( inconsistencies indicate problems)Superimposed iPatRec tracks over true tracks,Check track reconstruction in difficult design luminosity event,Selected event has two high pt (560GeV) jets ( DC1dataset 2045)Luminosity 1034Silicon space points
18、27,000TRT hits 240,000Reconstructed tracks 120Reconstructed in 20 minutes,2D projections of Inner Detector data not very useful at design luminosity,(TRT -ve barrel only),V-Plot silicon space points,Fh calorimeters,Filtering of space points available inside Atlantis,Filter space points with a histog
19、ram based technique which selects hits consistent with tracks originating from the primary vertex. Time = 1 sec/event ATLAS note in preparation,Filtered hits iPatRec tracks True tracks,36 tracks440 GeV,34 tracks410 GeV,25 tracks 222 GeV,27 tracks 270 GeV,Tracks lost in core of central jet,STr,iPat,S
20、3D(STr,iPat),iPat, xKal,iPat,S3D(Filter,iPat),Lists,Up till now we have seen how to investigate data and association present on the input file.Lists allow user to dynamically create and manage their own associations grouping of objectperform context dependent operationse.g. vertex a set of reconstru
21、cted tracks,Identifying secondary vertices Look for a group of nearby kinked Vs in the VPlot,Reconstructed tracks,True tracks,D,B,Y/X projection region around the primary vertex,Region around primary vertex,Reconstructed tracks,True tracks,Primary,B,D,3s error ellipse,Secondary vertex region best di
22、splayed in abstract 3D Box,Plane containing primary vertex,Plane containing secondary vertex,primary vertex,Ellipses represent track error (1s),secondary vertex,Comparison of muon and inner detector track fits,V-Plot allows comparison of f, h and pt,p = 28 GeV Dp = 5 GeV Df = 1.5 deg Dh = 0.02,p = 25 GeV Dp = 4 GeV Df = 1.0 deg Dh = 0.01,f,h,Inner detector tracks,muon tracks,Cell clustering and Jet reconstruction AtlFast (DC1- QCD event),Cells coloured by cluster (Area a E),Jet (Area a E),E= 13 GeV,SE= 347 GeV,Details of cell clustering,?,Bug ?,
