RICH detector for CLAS12

1

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

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 gt 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

3
Phase Space
Particles do not cover uniformly the
sector Exploit sector symmetry only one sector
simulated
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 ? 11000 at 80 efficiency or 1100
at 95 efficiency Note sJ is not constant vs p
(to be understood)
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 ? 11000 at 80 efficiency or 1100
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
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).