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--- software:g4simulation:radiation_studies [2020/07/07 10:39] – [First example] himuser
+++ software:g4simulation:radiation_studies [2022/03/14 13:53] (current) – himuser
@@ Line 58: / Line 58: @@
       * instantiates a sensitive detector and assigns it to the full hall
     * ''class PRIMARadStudiesSD''\\ sensitive detector (derives from ''G4VSensitiveDetector'') holding the radiation map (''PRIMARadStudiesMap'' object).
-      * The ''ProcessHit'' functioning is:
+      * The ''ProcessHit'' functioning:
         * finds the voxel corresponding to the mid point of the step
         * calculates the energy deposit to density ratio
         * creates/updates map entry for that voxels
       * A method ''WriteTextFile'' is provided to dump the map into a ASCII file for testing purposes. Activation and output file name are hard coded so far. Dynamical settings could be added to ''PRIMASimulationConfig'' if needed.
-  * ''rootmacros/rad_studies.C''\\ example macro for reading and handling the radiation map. The example loops over the map entries and makes a 2d map for the region around the yz-plane (vertical plane containing the beam direction).
@@ Line 76: / Line 74: @@
     * Iron for the octagonal pipe. The density of the pure iron "Armco-Eisen" has been used.
-  * geometry/PRIMABeamPipe.{hh,cc}\\ Two support functions are defined
+  * Two support functions are defined and implemented in ''geometry/PRIMABeamPipe.{hh,cc}''
+    * ''TGeoVolume* ConstructVacuumVolume()''\\ defines the vacuum volume, i.e. inner scattering chamber and inner beam pipe, as a single ''TGeoVolume'' from a composite shape. This is important to ensure that the beam electrons inside the vacuum can travel until the end of the hall without unwanted material layers.
+    * ''TGeoVolumeAssembly* ConstructBeamPipe()''\\ places the vacuum volume, the aluminium flange at the target chamber exit, and a simplified "octagonal" pipe (defined as a cone) inside a ''TGeoVolumeAssembly''
+  * A new main is implemented in ''geometry/build_beam_pipe.cxx'' for generating the root file with the geometry, containing the assembly described above and the tantalum target inside the hall.
-== Settings ==
+== Geant4 Settings ==
+  * Geometry: as just described.
+  * Primary generator: the particle gun shooting electrons
+    * from the beam axis upstream of the target
+    * in the beam direction (positive z direction)
+    * with an energy of 1.5 GeV
+  * Simulated events: 10<sup>6</sup>
 == Results ==
+In order to analyse the output map from the geant4 simulation the example macro ''rootmacros/rad_studies.C'' has been introduced. It shows:
+  * how to read and handle the radiation map,
+  * how to loop over the map entries, and
+  * make a 2d map for the region around the yz-plane (vertical plane containing the beam direction).
+{{ :software:g4simulation:rad_map_x0_example.png?nolink&500 |}}
+== FLUKA simulations ==
+A guide to the FLUKA simulations using Flair can be found [[FLUKA#Simulations|here]]