a simple simulation of a muon detector made of LiquidO

useful pieces of information

to source a complete LCG environment: source /cvmfs/sft.cern.ch/lcg/views/setupViews.sh LCG_96 x86_64-centos7-gcc8-opt
- now implemented in setup_lxplus.sh, where if any additional argument is given the version with debugging info is linked (source setup_lxplus.sh 1)
original simulation code of LiquidO is here
to have the mac working, always use ssh -Y and, on your mac, enable “indirect GL” in XQuartz, with the command defaults write org.macosforge.xquartz.X11 enable_iglx -bool true
documentation on Geometry in Geant4 at this link
Geant4 example
Getting started with Geant4

MUON_DetectorConstruction: where the geometry of the detector is defined
- remember: for each object one needs:
  - a solid = shape and size
  - a logical volume = solid + properties (material, whether it's sensitive...)
  - a physical volume = location of the object
  - NB the physical volume is placed inside a logical volume somehow, so it seems it's enough to replicate the most external one of them all
MUON_DetectorMessenger: pass the infoes from the mac file to the Detector Construction
MUON_OpticalPhotonSD: behaviour of the sensitive detectors in the geome
- the single elements are identified by the copy number, I think
the simulation process is composed of a run of events, which are processed in the following hierarchically organised actions:
- MUON_RunAction: Begin and end of the run
- MUON_EventAction: Begin and end of an event
- MUON_TrackingAction: Begin and end of tracking
- MUON_SteppingAction: At each step in which the tracking process is divided

A single slab of scintillating LiquidO, with square section in the (x,y) plane, is filled in the middle with an array of fibres, parallel to the base surface.
each readout unit (ru_l) is composed of a fibre and a SiPM, and contains an overall envelope (fiber_env_l)
each fibre is composed of an outer cladding (fiber_outer_cladding_l), inner cladding (fiber_inner_cladding_l), and core (fiber_core_l)
each SiPM is composed of an overall volume (ru_sipmt_l) and a sensitive volume (ru_sipmt_sens_l)
there's a SiPM on each side of each fibre (ru_sipmt_top_p, ru_sipmt_bot_p)