1. … 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

2. 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 > 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

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

4. 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

5. 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

6. 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