How to Create a Hole in a Solid Box in Geant4?

In our last post on Geant4, we saw How to create a solid box in Geant4. In that post, we discussed all the necessary files used to make a solid box. In this post, we will create a hole in the same box.

If you want to create a hole in a solid box using Geant4, you’ll typically use its geometry description capabilities. Geant4 provides a rich set of classes for creating complex geometries. To create a hole you need to add some lines in the Detector Construction Source Code File (DetectorConstruction.cc). All other files will be the same that we used in the last simulation for creating a solid box.

Here’s the necessary DetectorConstruction.cc file to create a hole in a solid box:

This example creates a cubic box of size 4\times 3\times 2\rm \ m^3 and a smaller box of size 2\times 1\times 2.1\rm \ m^3 to represent the hole. It then uses the G4SubtractionSolid class to subtract the smaller box (hole) from the larger box. Finally, it creates a logical volume and places it in the world. You can write the code according to your specific needs and customize the DetectorConstruction.cc file based on your geometry requirements.

To run the program

• make a folder named “build” in the directory where you saved all these files
• open a terminal in the “build” folder and run the command

cmake ..
make
./sim

And finally, you will get the output as shown below.