X-ray Telescope Example
This is a real-life Geant4 application for the simulation of a typical X-ray telescope, equipped with interactive UI,
AIDA tools for histogramming and advanced visualisation facilities. The example is of general interest also for
applications in other domains.
Geometry Physics Visualisation Histogramming
UI How to run Whom to contact
Geometry and Physics
Views of the X-ray telescope can be seen on the right.

The telescope mirror consists of a single shell grazing incidence mirror (depicted in blue) made up of two parabolic and two
hyperbolic mirror sections made in nickel with a gold coating on their inner surfaces. An aluminium stop (shown in grey) limits
the telescope aperture gap to 2mm along its entire length. On the bottom pannel the main carbon fibre telescope tube has been left
out to show the focal plane, which consists of a silicon detector (used to represent a CCD) inside a conical titanium baffle. The full
geometry can be viewed in VRML.
In an example run an isotropic distribution of 106 500keV protons was released within a small annular region around the
telescope aperture. The physics of interest in this case is the propagation of protons through the X-ray mirrors through multiple
scattering processes. The bottom panel shows the tracks of 27 protons that actually reached the detector at the focal plane.
Back to top
Visualisation
The example shows how to produce:
high quality postscript output
VRML files for the web
Information on Geant4 Visualisation
DAWN can be downloaded from this page.
Back to top
Histogramming
The example shows how to produce:
histograms through the AIDA
interface
AIDA Abstract Interfaces for Data Analysis
JAS analysis system
Lizard analysis system
OpenScientist analysis system
Back to top
User Interface
The example shows how to set-up:
an advanced flexible GUI to configure the set-up and control the execution
Geant4 GUI and Environments
G4UIJAG, JAS, Java-2, GAG can be downloaded from this page.
Back to top
How to run the example
Software to be installed:
DAWN and DAWNCUT
Mesa
VRML viewer
The following environmental variables should be set:
Back to top
Contactperson
For further information please contact Ramon Nartallo (ESA/ESTEC).
Back to top
Last modified 2 December 2000
Ramon Nartallo
Petteri Nieminen Maria Grazia Pia