User Documents and Examples I. Geant4 Tutorial at Jefferson Lab 9 July 2012 Dennis Wright

Transcription

1 User Documents and Examples I Geant4 Tutorial at Jefferson Lab 9 July 2012 Dennis Wright

2 Outline User Documents InstallaEon Guide ApplicaEon Developers Guide Novice Examples simple: trivial detector with non- interaceng parecles detailed: complex detector with full physics User Aids LXR source code browser HyperNews User Forum 2

3 Geant4 Web Pages hsp://geant4.cern.ch 3

4 InstallaEon Guide URL: geant4.web.cern.ch/geant4/userdocumentaeon/ UsersGuides/InstallaEonGuide/html/ List of supported plaworms currently Linux, Mac OSX, Windows List of required so\ware C++ compiler, GNUmake, Cmake, Geant4 toolkit choices for visualizaeon so\ware How to install using CMake or GNUmake How to make an executable program geant4.web.cern.ch/geant4/userdocumentaeon/usersguides/ ForApplicaEonDeveloper/html/ ch02s07.html#sect.howtomakeexec.cmake.exampleb1 4

5 ApplicaEon Developers Guide URL: geant4.web.cern.ch/geant4/userdocumentaeon/ UsersGuides/ForApplicaEonDeveloper/html/index.html Introduces new users to Geant4 toolkit Describes the most useful tools Describes how to set up and run a simulaeon applicaeon Intended as an overview of the toolkit, not an exhauseve treatment. For more details: Physics Reference Manual Toolkit Developers Guide 5

6 - Fixed geometry: Ar gas mother volume with Al cylinder and Pb block with Al slices Novice Example N01 - Incident parecle is a GeanEno no physics interaceons - No magneec field and only the transportaeon process is enabled - Hard- coded batch job and verbosity 6

7 - Pb target, Xe gas cambers (parameterized volumes) Novice Example N02 - Detector response trajectories and chamber hit colleceons may be stored - VisualizaEon of detector and event - Command interface introduced can change target, chamber materials, magneec field, incident parecle type, momentum, etc. at run Eme 7

8 - Sampling calorimeter with layers of Pb absorber and liquid Ar deteceon gaps (replicas) Novice Example N03 - ExhausEve material definieons - Command interface - RandomizaEon of incident beam - All EM processes + decay, with separate produceon cuts for γ, e-, e+ - VisualizaEon tutorial - Random number seed handling 8

9 - Simplified collider detector all manner of volume definieons - MagneEc field Novice Example N04 - Events from HEP primary generator (Pythia) Higgs- decay by Z0, lepton pairs - Full set of EM + hadronic processes uses updated hadronic physics lists - Event filtering using stacking aceon 9

10 Novice Example N05 - Fast simulaeon with parameterized showers EM showers (derived from G4VFastSimulaEonModel) pion showers (for illustraeon only not used) - EM physics only use of G4FastSimulaEonManagerProcess - Simplified collider detector geometry (as in Example N04) dri\ chamber EM, hadronic calorimeters 10

11 - Water Cerenkov detector with air bubble Novice Example N06 - Materials specificaeon of opecal properees specificaeon of scinellaeon spectra - Physics opecal processes generaeon of Cerenkov radiaeon, energy loss collected to produce scinellaeon 11

12 - Three simplified sandwich calorimeters (an in Example 3) with Pb, Al, Ar - Cylindrical ghost volumes for scoring - Run- based (as opposed to event- based) hit accumulaeon - Changing geometries without rebuilding world Novice Example N07 - Sepng different secondary produceon cuts for each calorimeter using G4Region 12

13 LXR Code Browser URL: www- geant4.kek.jp/lxr/ Search enere Geant4 source tree by filename (e.g. G4Track.hh) idenefier text Result: a source file fully hyper- linked to classes and methods tells where classes and methods are defined also where they are referenced Also have a doxygen version: www- geant4.kek.jp/reference 13

14 HyperNews User Forum URL: hypernews.slac.stanford.edu/hypernews/geant4/cindex See also top of Geant4 home page Discuss problems with other users, post queseons for experts, etc. 23 forums roughly based on Geant4 categories 4 forums for specific applicaeon areas New forums may be requested by users To join: click on New Member at top of page and fill out form 14

15 Summary InstallaEon and ApplicaEon Developers Guides tell you how to get started building Geant4 and then building and running a simulaeon There are 7 novice examples ranging from very easy to complex can use these as templates for your applicaeons A cross reference browser (LXR) is available for studying source code (also doxygen) A user forum is available for sharing ideas, asking queseons 15