… continue with realistic particle RICH detector for CLAS12 … continue with realistic particle Phase space INFN-Rome and ISS 06 November 2008 06 Nov 2008 Clas12-RICH

MonteCarlo “Upgrade” Old GEANT3/Fortran/PAW based MonteCarlo framework used for the development of the Hall A Proximity RICH Different Geometry and Size! Limitation on photon production (due to old memory constraint), becomes relevant for radiator thickness > 2.5-3.0 cm Limitation on number of tracks that can be processed (around 13000) Realistic Charged particles phase space at the LTCC-RICH entrance window; simulated data from Harut Still use arcs as radiator and detector geometries 06 Nov 2008 Clas12-RICH

Phase Space Particles do not cover uniformly the sector Exploit sector symmetry: only one sector simulated 06 Nov 2008 Clas12-RICH

Radiator cover 5-30 degree Optimal detector around the black lines Single sector: Radiator size  4 m2 Detector size ~ 14 m2 6 sectors: Radiator size  24 m2 Detector size ~ 40 m2 4s at 5 GeV  1:1000 at 80% efficiency or 1:100 at 95% efficiency Note: sJ is not constant vs p (to be understood) 06 Nov 2008 Clas12-RICH

Radiator cover 5-20 degree Optimal detector around the black lines Single sector: Radiator size  1.5 m2 Detector size ~ 14 m2 6 sectors: Radiator size  10 m2 Detector size ~ 40 m2 4s at 5 GeV  1:1000 at 80% efficiency or 1:100 at 95% efficiency Note: sJ is not constant vs p (to be understood) Optimal detector size does not seem to change significantly respect to 5-30 degree coverage 06 Nov 2008 Clas12-RICH

Considerations Realistic phase space seems to be slightly asymmetric inside a single sector Optimal Radiator and detectors shape are not simple arcs Overall performances slightly improves of ~0.5s at 5 GeV/c respect to previous simulations. 5-20 degree coverage reduce (1/2) the radiator size, but does not seem to be significant for the detector (other configuration must be analyzed). 06 Nov 2008 Clas12-RICH