Optical physicslist tool

[atolosadelgado]

Hi,

Optical physics will be needed for optical calorimeters and the ARC.

I have copied the tool which allows to register the Optical Physics on top of a full physics list.
https://github.com/HEP-FCC/dual-readout/blob/master/DRsim/DRsimG4Full/src/components/SimG4OpticalPhysicsList.cpp

I have added setters for the 3 optical processes: Cerenkov, Scintillation and Transition Radiation.

Cerenkov and Scintillation are enabled by default, as in the original file.

The code is rather small, so a test for just this is not worth it. However, it might be healthy for the repository to have a minimal simulation as test, to notice changes in Geant4 or DD4hep.

Best,
Alvaro

[BrieucF]

Thanks Alvaro! Could you still add an example on how this tool should be instantiated and used in a Gaudi steering file? Event though they are not ran as tests per se I guess they could still go to SimG4Components/tests/options, what do you think @kjvbrt ?

[atolosadelgado]

@kjvbrt suggested a very simple self-contained example, which consist in a minimal compact file that allow to run a silent simulation. This example can actually be a test, to check if there is any mention to the optical processes in the standard output. I am on it.

[atolosadelgado]

Hi,
I have introduced a gaudi script to run a simple simulation and test if some Optical Physics processes are being activated when the tool that wraps the FTFpBert+Optics is used.

The steering file just loads the geometry and G4, and launch 1 event. The details of the optical physics are printed just before starting the simulation, and the test checks if the printout contains the reference to optical processes.

To be studied the possibility of concatenating Gaudi tools in order to register different physics lists in a modular way as it is done in G4

[andresailer]

Actually this is the k4FWCore location https://github.com/key4hep/k4FWCore/blob/main/k4Interface/include/k4Interface/ISimG4PhysicsList.h

Suggested change

	// FCCSW
	// k4FWCore

But there is also the same file here https://github.com/HEP-FCC/k4SimGeant4/blob/main/SimG4Interface/include/SimG4Interface/ISimG4PhysicsList.h
And it should be dropped in k4SimGeant4.

[atolosadelgado]

I took as template another physics lists existing in this repo. If refactoring of this and other physics lists tools is needed, maybe it is worth to do it in a separate PR?

[andresailer]

Yes, probably worth doing a separate PR.