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ALFA GeoModel Implementation and Simulation Status: First Steps and Challenges

This document summarizes the status of the ALFA GeoModel implementation and MC simulation, presented at the ALFA meeting at CERN on May 24, 2006. It outlines the current state of the ATHENA framework, discussing geometry and materials used in the simulations, issues encountered with component compatibility, and the development of a testing volume for particle energy evaluation. It highlights achievements, ongoing tasks, and the need for further integration of components like Roman Pots into the GeoModel for enhanced simulation accuracy.

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ALFA GeoModel Implementation and Simulation Status: First Steps and Challenges

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  1. ALFA GeoModel implementation and simulation status • ATHENA, what is our job? • ALFA GeoModel implementation • MC simulation – first steps • Problems • Summary Vít Vorobel ALFA meeting CERN 24.5.2006

  2. ATHENA network • DATA • Materials • Geometry (GeoModel) • Tile Cal • SCT • ALFA  we have to provide to ATLAS • … • Settings • … • … • TOOLS • Simulation (GEANT)  we may use for ALFA • Analysis (Root) ALFA meeting CERN 24.5.2006

  3. GeoModel - Geometry & materials • Si-1,2,3 – Si, r= 2.3g/cm3, 0.3x100x100mm • PS – Polystyrene (C8H8)n , r=1.05g/cm3 ,8x16x12mm • Air – 20%O2, 80%N2, r= 1.29mg/cm3 • ALFA detector • Ceramics – Al2O3 , r=3.7g/cm3 , 0.17x16x12mm • Plastic layers – material as PS, 0.5x16x12mm, logically divided to • Sensitive cores of fibers □0.48 mm • Insensitive everything else simulating cladding, glue, and spacers • Fibers positioned regulary with x and pinch from metrology data, slope=45° • Fibers are not cutted on the edge. Si-2 Si-1 Si-3 PS ALFA 23.17 173 135 270 160 ALFA meeting CERN 24.5.2006

  4. MC simulation • A testing volume built and a particle shouted from IP to the volume • Deposited energy evaluated end histogrammed ALFA meeting CERN 24.5.2006

  5. Problems • All components of the ATHENA framework are under development • New versions of the components are released independently – are not compatible • E.g. • version…&version…  histograms are not built • V….&v…. histohrams are built but not visible • V….&v….  segmentation fault • . • . • Users (we) never know if the user code is wrong or the used components are not compatible ALFA meeting CERN 24.5.2006

  6. Conclusion • Achievements • GeoModel – The present code includes • The ALFA and Overlap detectors with ideal fiber staggering • The detectors are “cloned” to all stations • MC Simulation – we are able • to shout a particle into a testing volume • To read and histogram the energy deposition in the testing volume • Tasks to do • Add Roman Pots to GeoModel • Learn how to read a real geometry from the database • Learn how to modify idealreal geometry in GeoModel • Ask an administrator to add our code to ATHENA framework • Extend MC simulation from a testing volume to ALFA detector

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