Atlantis event display tutorial

Transcription

1 Atlantis event display tutorial basic features Zdenek Maxa (University College London) Atlantis team

2 Introduction features Atlantis event display is a stand-alone Java application Uses variety of 2D projections, multiple views (windows) on canvas A part of the ATLAS offline SW, but depends only on Java Uses simplified detector geometry (not a detector display) JiveXML (written in C++) interfaces ATLAS SW framework Athena (its event store) and Atlantis, JiveXML produces XML event files containing physics information Access to event data from Atlantis locally reading XML event files produced by JiveXML (offline) reading event data over network from JiveXML server (online) 2

3 Introduction goals Primary goals visual investigation and understanding of complete ATLAS events Secondary goals help develop reconstruction and analysis algorithms commissioning support (special subsystems features e.g. TileCal pulse shapes, online Point1 monitoring, etc) pictures and animations for publications and presentations interactive analysis (interactive Athena) 3

4 Data The following data may currently be visualised in Atlantis 3D silicon points, silicon strip clusters and TRT straws Si Geant hits, Trigger space points Simulated tracks, neutral particles, sim. and rec. vertices Reconstructed tracks - collections from Trk::Track Reconstructed secondary vertices LAr, Tile, HEC and FCAL calorimeter cells and clusters ROIs, Jet, ETMis Muon data - MDT, RPC, TGC, CSC hits and CSC clusters Simulated and reconstructed muon tracks Associations (hits to track, cells to cluster etc) AOD data 4

5 Detector/Data oriented projections 3D Cartesian coordinates x,y,z are not always optimal for colliding beam experiments More natural and useful are the non-linear combinations which reflect the design of ATLAS ρ = sqrt(x2+y2) φ = arctan(y/x) θ = arctan(ρ/z) where x, y, z need to be slightly modified to take into account the primary vertex of the underlying event (xvtx yvtx zvtx ) x' = x-xvtx, y' = y-yvtx, z' = z-zvtx 5

6 YX projection TILE, LAr barrel, RPC (intuitive) RPC 6

7 ρz projection calos, muon hits (intuitive) 7

8 ΦZ projection - TRT and LAr endcaps, HEC, TGC TGC TRT 8

9 Φη projection and the V-Plot Φ ρ = ρ Max V-Plot Draw each space point twice at Φ,η+k*(ρ-ρMax) and Φ,η-k*(ρ-ρMax) ρ= 2cm η low pt, -ve Distorted V s track not from IP high pt, +ve 9 3D information For tracks can judge Φ η pt (slope of V arms) charge (down: -ve up: +ve)

10 Detector Geometry Used to convey quickly to the user the context in which physics information (event) is 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 Geometry files are stored in two separate XML files (1 InDet, Calo ; 2 - Muon) produced by JiveXML which takes the information from Athena detector store (GeoModel) 10

11 Atlantis Canvas & GUI menu bar window control (drag & drop) interaction control ZMR Pick Rubberband Synchro cursor menus Projections Data switches Cuts Data configs InDet Calo Muon AOD Subdetectors output window 11

12 Online help for (almost ;-) every component right click on component - online help windows pops up 12 hover for tool-tip help

13 Atlantis/JiveXML visualisation ATLAS detector offline / online / interactive mode of running with respect to the Athena framework byte stream digi files ESD, AOD XML event files read offline (1MB current cosmics, 15MB full lumi) Atlantis Canvas (XY view) 1 2 XML event data read online over network using XMLRPC, on-demand transfer of event data 3 JiveXML offline framework Athena runs reconstruction chain and JiveXML converter Athena Atlantis interactively (two way, interactive analysis) 13

14 Online event access Atlantis Canvas ρz view Atlantis sends event data requests over network (on demand / automatically - timer) JiveXML XMLRPC server (running as a posix thread in Athena) transmits XML event data 1-to-N communication model (many users retrieving the same reconstructed events) Online event access dialog XML event data in payload of XMLRPC message XMLRPC server JiveXML Athena <?xml version="1.0"?> <methodresponse> <params> <param> <value> <string>...event data... </string> </value> </param> </params> <methodresponse> 14 Get Event timer Save event

15 Interactive Athena Interactive (Python) prompt facility of the Athena framework enabling to steer it interactively using Athena commands (interactive analysis) InteractiveServer counterpart of Atlantis on the Athena prompt implemented in Python, it acts as XMLRPC server receives Athena commands from Atlantis user who drives Athena from Atlantis dialog 1-to-1 communication model, the user controls own Athena session Atlantis user can instruct Athena to process next event, change / query job-options of the framework, execute algorithms, etc Use case: In my display, I see three tracks which look like coming from a secondary vertex. I want to fit a vertex with the Athena vertexing tool 15

16 Interactive vertexing XY view, zoomed into ATLAS Inner Detector (internal Atlantis vertex fitter) (2) put selected tracks into the list (3) call Athena vertex fitter (4) at Athena, InteractiveServer receives tracks indices and calls the vertex fitter (1) select (rubberband) few tracks (5) if found, vertex is stored into event store interactive Athena dialog (6) get updated event data 16

17 Information sources, download Atlantis Atlantis website: download, install, run (double click on atlantis.jar under MS Win, java -jar atlantis.jar on Linux) plenty of documentation, startup guide, etc picture database Atlantis available in the ATLAS offline SW releases under the directory graphics/atlantisjava 17

18 Former contributors Many people contributed to the development of Atlantis. In particular: Gary Taylor (UC Santa Cruz) Dumitru Petrusca (Siegen/CERN) Jon Couchman (UCL) Frans Crijns (Nijmegen) Janice Drohan (UCL) Qiang Lu (Birmingham) 18 Principal developer Initial work on GUI, calos Athena algorithm (JiveXML) Muon geometry CTB features Development

19 Current contributors Hans Drevermann (CERN) Eric Jansen (Nijmegen) Peter Klok (Nijmegen) Adam Davison (UCL) Nikos Konstantinidis (UCL) Sebastian Boeser (UCL) Zdenek Maxa (UCL) Juergen Thomas (Birmingham) Mark Stockton (Birmingham) Charles Timmermans (Nijmegen) Peter Watkins (Birmingham) 19 Original ideas, Fortran version Development Webpage / picture database Development Development, co-ordination Development Development JiveXML development Development Development Co-ordination