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Simulation PowerPoint Presentation

Simulation

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Simulation

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  1. Hall D collaboration mtg JLab, November 1-2, 2001 R.T. Jones, UConn Simulation Monte Carlo detector simulation analysis R.T. Jones, Bloomington, Nov. 2, 2001

  2. 1 List of topics for this session • Brief walk-through of simulation chain • Demonstration of cluster production tools • How to: • set up and run a Geant simulation • modify the detector geometry • modify the hits structures • Support • Initial results from background study R.T. Jones, Bloomington, Nov. 2, 2001

  3. 2 Monte Carlo Data Acquisition digitized signals in buffers reaction specification generation event building final state raw event record simulation conversion hits geometric reconstruction tracks /clusters kinematic reconstruction final state R.T. Jones, Bloomington, Nov. 2, 2001 http://zeus.phys.uconn.edu/halld/datamodel/doc

  4. 3 • Walk-through of simulation chain 1. Set up generator input 2. Generate Monte Carlo sample 3. Translate Monte Carlo output to std format 4. Set up simulation input 5. Simulate Monte Carlo sample 6. Browse simulation output *rho.input *genr8 *rho.ascii *ascii2stdhep *rho.stdhep *stdhep2hddm *rho.hddm *control.in *hdgeant (geant.hbook) *hdgeant.hddm *hddm-xml *rhoSim.xml R.T. Jones, Bloomington, Nov. 2, 2001

  5. 4 • Demonstration of cluster production tools • Based on a dynamic Monte Carlo database concept • Java front-end for user requests and lookups • requires java 1.3 platform • Back-end implemented in perl • structure expressed in xml • content stored in unix fs • Designed for extended cluster computing environment • unified environment running at UConn and IU • Used for all simulation in Radphi • Used for Hall D background study R.T. Jones, Bloomington, Nov. 2, 2001

  6. 4 • How to’s • How to set up and run HDGeant yourself • How to modify the geometry • How to modify the hit structures R.T. Jones, Bloomington, Nov. 2, 2001

  7. 6 • How to set up and run HDGeant yourself • Edit control.in • Look at results in hdgeant.hddm • Customize gustep() to store intermediate results in histograms or ntuples: results saved in geant.hbook R.T. Jones, Bloomington, Nov. 2, 2001

  8. 7 • How to modify the geometry • Edit the xml geometry files • Compile the changes • Display results with hdgeant++ R.T. Jones, Bloomington, Nov. 2, 2001

  9. 8 • How to modify the hit structures • Edit the xml • Compile the changes: hddm-c • Relink and run hdgeant • Browse results in hdgeant.hddm R.T. Jones, Bloomington, Nov. 2, 2001

  10. 9 • Support: what is provided? • Working prototypes of all components exist in cvs • requires cernlib and apache xml (xerces) libraries • requires motif for interactive version • README in cvs/HDGeant to guide initial setup • Mailing list halld-mc@jlab.orgfor sharing experience and hdgeant@zeus.phys.uconn.edu for geant issues • Call-up assistance for active projects • rapid feedback to assist studies for CDR R.T. Jones, Bloomington, Nov. 2, 2001

  11. 10 • Background Study: preliminary results • Coherent bremsstrahlung beam with Etag 8.4 – 9.0 GeV and 5mm collimator 76m from 10-4 diamond radiator R.T. Jones, Bloomington, Nov. 2, 2001

  12. 11 • Background Study: preliminary results • About one second of 107 tags/s have been simulated • All hadronic interactions turned off (not for performance) • Particle flux, energy spectra recorded at several surfaces • Entrance to target (for beam normalization) • Start counter cylinder (r=5cm, z=35 - 125cm) • CDC entrance cylinder (r=15cm, z=17 - 217cm) • Entrance plane of Cerenkov (r>5cm, z=410cm) • Entrance plane of LGD (z=575cm) R.T. Jones, Bloomington, Nov. 2, 2001

  13. 12 • Background Study: preliminary results R.T. Jones, Bloomington, Nov. 2, 2001

  14. 13 • Background Study: preliminary results R.T. Jones, Bloomington, Nov. 2, 2001