status of dRICH simulation and analysis
simulations done mainly for old JLEIC apparatus, and one of the ePHENIX spectometers (few years ago).
existing SW
- standalone MC based on GEMC (Alessio Del Dotto)
- AI driven optimisation (C. Fanelli)
- beta version PID reconstruction (Zhiwen Zhao)
- Fast parametriesed model (Roberto P)
inverse ray tracing method, makes use of info of incoming particle: direction of track and impact.
with manual smearing to simulate tracking performance.
two main components of the simulation, which are so far separated
- geometrical description
- optical characteristics
geometry ported also in TGeoManager.
is this parametrisable? no, can be done relatively easily.
for the moment, to change positions one has to recompile the model.
optical characteristics of the model (refractive index, absorption lenght, mirror reflectivity, ...)
must be parametrised as much as possible.
this information is
people working on dRICH porting to ... which model?
Cristiano Fanelli
Christophes Dilks and Anselm Vossen (Duke)
Evaristo and Guido
with support from D Romanoc and Alessio Del Dotto
Dimitry took the TGeo model and ported it into g4e.
can also write geometry (volumes and material) in text files.
it is not GDML, why not ? text file is very simple for parameterisation and readable.
can be read by any G4 application.
same file can be read in fun4all.
further steps include
- digitisation of sensor (better outside simulation)
- single-photon angle reconstruction (inverse RT)
-
analysis part, inverse ray tracing is a box that takes as input
- hit position of photon
- track position and direction
- geometry
possible idea is to have interface code to read hits form g4e and fun4all (specialised) and write output in common language (tree) to be used for digitisation and analysis.