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Geant4/examples/advanced/xray_telescope/

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Name Size       Last modified (GMT) Description
Back Parent directory       2024-12-05 15:16:16
Folder include/       2024-12-05 15:16:16
Folder src/       2024-12-05 15:16:16
File CMakeLists.txt 2351 bytes       2024-12-05 15:16:16
File GNUmakefile 468 bytes       2024-12-05 15:16:16
File History 7280 bytes       2024-12-05 15:16:16
File README 3123 bytes       2024-12-05 15:16:16
C++ file XrayTel.cc 5229 bytes       2024-12-05 15:16:16
File geantino.mac 158 bytes       2024-12-05 15:16:16
File test.mac 392 bytes       2024-12-05 15:16:16
File vis.mac 2021 bytes       2024-12-05 15:16:16
File xray_telescope.out 20526 bytes       2024-12-05 15:16:16

  1 -------------------------------------------------------------------
  2 
  3      =========================================================
  4                Geant4 - X-Ray Telescope Example
  5      =========================================================
  6 
  7 
  8 Introduction
  9 ------------
 10 XrayTel is an advanced Geant4 example based on a realistic simulation of 
 11 an X-ray Telescope.  It is based on work carried out by a team of Geant4 
 12 experts to simulate the interaction between X-ray Telescopes XMM-Newton 
 13 and Chandra with low energy protons present in the orbital radiation 
 14 background.  The X-ray mirrors are designed to collect x-ray photons at
 15 grazing-incidence angles and focus them onto detectors at the focal plane.
 16 However, this mechanism also seems to work for low energy protons which,
 17 if they reach the detectors in sufficient numbers, can cause damage.
 18 In this example, the geometry has been simplified by using a single mirror 
 19 shell and no baffles, but all the dimensions and materials are realistic.
 20 
 21 The aim of this advanced example is to illustrate the use advanced 
 22 GUI, visualisation, particle generation and analysis schemes available 
 23 in Geant4:
 24 
 25  - macros are provided to display the geometry and particle tracks with 
 26    OpenGL, DAWN Postscript or VRML visualisation
 27 
 28  - the generation of particles is done via the new General Particle Source
 29 
 30  - histograming facilities are available through the G4AnalysisManager tools
 31 
 32 In order to be able to use any of these packages, prior installation is 
 33 necessary and a number of environment variables will have to be set.
 34 
 35 
 36 NOTE: The geometry is refreshed on the viewer at the beginning of each run, 
 37       but the tracks are plotted only in case an interesting event occurs. 
 38       This is the case only for about 1 every 10**4 events.
 39 
 40 
 41 
 42 2. Run
 43 
 44 To execute a sample simulation with visualisation of proton tracks
 45 reaching the detector run:
 46 
 47 XrayTel 
 48 
 49 execute command "/control/execute test.mac"
 50 
 51 To enable visualisation, uncomment one line from test.mac:
 52 /control/execute vis.mac
 53 
 54 If the analysis options are set, histograms will
 55 automatically created and the corresponding files will be created.
 56 A 1D histogram will display the energy distribution of the protons
 57 that reach the detector at the end of the run.
 58 
 59 
 60 3. Detector description
 61 
 62 The telescope and detector geometry is defined in 
 63 XrayTelDetectorConstruction.cc
 64 
 65 
 66 4. Physics processes
 67 
 68 The physics processes are in XrayTelPhysicsList.cc
 69 The main process in this example is G4hMultipleScattering for scattering of the protons
 70 off the mirror surfaces.
 71 
 72 
 73 5. Event generation
 74 
 75 This is done using the new General Particle Source. Documentation for 
 76 this can be found in:
 77 
 78 http://reat.space.qinetiq.com/gps/
 79 
 80 
 81 6. Analysis
 82 
 83 Relevant information from the simulation is processed in the XrayTelAnalysis
 84 class and saved, through the G4AnalysisManager interface, to Histograms and 
 85 Tuples. The output file is written in Root format, but one can easily switch to Xml (or Csv, Hdf5) by changing the G4AnalysisManager default file type in XrayTelAnalysis::book().
 86 No external software is required (apart from the Hdf5 case).
 87