feat: Geant4OpticalTrackerAction which stops-and-kills optical photons

[wdconinc]

In the EIC detectors we use various photo-sensitive pixel planes in the DIRC and RICH detectors. This is similar to a tracker in the overall SD action sense, but instead of requiring optical photons energy deposition in the material of the sensor (e.g. SiPM, LAPPD, AC-LGAD), we often don't model the optical properties of the materials in the sensors and simply stop-and-kill the optical photon when it reaches the sensor. This is an SD action that achieves this.

I have no geometry to easily test the processFastSim functionality with.

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• Geant4OpticalTrackerAction which stops-and-kills optical photons for e.g. SiPM sensor planes

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[andresailer]

Hi Wouter,
Do you have a simple detector that we could add to the examples to use this plugin?

[wdconinc]

simple detector

Well... Probably not an entire RICH? Though maybe @c-dilks would be open to turning our dual RICH into a standalone example that demonstrates this. Otherwise we can also do our proximity-focused RICH which is a bit simpler.

[c-dilks]

Hi @wdconinc, I opened wdconinc#2 targeting your fork's branch, which adds a PFRICH. It needs some more work to make it nice, but I think I see the increase in the number of hits. See the description within for more details.

[wdconinc]

Do you have a simple detector that we could add to the examples to use this plugin?

Example added as #974. Not sure if it's what you'd consider 'simple' but it is at least much simpler than how we are using it in production :-D

So, I'd suggest either merging this and moving example discussion to the example PR, or closing this and merging the tracker SD action as part of the example PR.

[andresailer]

Thanks! I will merge this, and then #974 can be rebased to add the example.