sct geometry status december 2000 christopher lester@cern ch
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SCT Geometry Status: December 2000 [email protected] SCT Geometry Status. DISCLAIMER: These slides are only going to deal with AGDD/XML related geometry issues. This talk is only meant to describe the work I have been closely involved in. Where are we now? Where are we going?

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sct geometry status
SCT Geometry Status
    • These slides are only going to deal with AGDD/XML related geometry issues. This talk is only meant to describe the work I have been closely involved in.
  • Where are we now?
  • Where are we going?
  • Related work.

[email protected]

q on the full sct geometry where are we now
Q: On the full SCT geometry, where are we now?
  • A: Largely where we were in August!
  • The present AGDD representation of the full SCT geometry in Geant4 is still the transcription from DICE/AGE of the geometry used for the Inner Detector TDR.

[email protected]

how is our geometry produced


How is our geometry produced?
  • We have a basic set of numbers which parametrise the detector. These happen to be stored in an XML file called a “preXml file”.
  • We have geometrical knowledge hard coded into a C++ program. This “Geometry code” can read the preXml file and generate an AGDD/XML file.
  • The production of a well formed AGDD/XML file is made easier by using a set of generic tools provided by “AGDD_XmlFileBuilder”.
  • The “AGDD_XmlFileBuilder” tools ...
  • allow AGDD/XML files to be created as a tree in memory, rather than as a sequential output stream
  • enforce adherence to more AGDD/XML syntax requirements than present XML checkers alone
  • allow some separation between “intent” and “output format”

[email protected]

where is the geometry generated
Where is the geometry generated?
  • All code is available in the ATLAS offline software repository under: /afs/
  • In particular:
    • the SCT specific stuff is in the package: offline/InDetDetDescr/SCT_AGDD_XmlFileBuilder
    • while the generic tools are in the package: offline/DetectorDescription/AGDD_XmlFileBuilder

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where are we going 1
Where are we going? (1)
  • AGDD/XML syntax is perhaps about to undergo some large changes:
    • New emphasis:
      • Detector specific elements may be introduced
      • Possible reduction of inter-dependencies within AGDD/XML files?
    • New features / expectations:
      • Level-of-detail mechanism (LeCompte et al)
      • Envelopes (Laporte et al)
      • “Surnames” (Dell’Acqua et al)
  • Some/all of the above may result in next version of geometry being very different from current !

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where are we going 2
Where are we going? (2)
  • Physical geometry has moved on since ID-TDR. Need to update!
    • Jo Pater is about to update existing AGE geometry to match present “best guesses” at detector configuration.
    • The next geometry produced within the AGDD/XML framework ought to be
      • generated from the “same drawings” as Jo’s new AGE geometry ...
      • … but the next AGDD/XML geometry (unlike the present one) the should not be a slavish copy of AGE. The new geometry should be constructed independently. Intended result: Better AGDD/XML, and no bad habits inherited from age.
  • Who will do all of this ? I have to write a thesis soon …..

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related work sct modules
Szymon Gadomski is firing particles through simulations of SCT modules

As a by-product this generates a test of SCT geometry within AGDD/XML and G4Builder framework

Related work: SCT Modules

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thanks to the g4 team
Thanks to the G4 Team!
  • I would like to thank the Geant4 team for help and advice they have given me over the last few months in helping me solve problems with these geometries.

[email protected]