Comparison of radiation damage between FLUKA and Geant

• Photon energy spectrum used in the simulations (photon flux corresponds to high-luminosity run)

• Silicon damage function used by FLUKA

• Particle spectra through the SiPM

RADCON GEANT

FLUKA

FLUKA

• Particle fluences around barrel calorimeter (1-MeV neutron equivalent in Si)

FLUKA. Beam power at the target = 0.704 W

FLUKA. Beam power at the target = 0.704 W

• Total fluence (1-MeV neutron equivalent in Si) in Si PM plane

FLUKA. Si PM limited by two circles with radii of 65 cm and 90 cm

• Particle fluences (1-MeV neutron equivalent in Si) in Hall D

FLUKA. Beam power at the target = 0.704 W

FLUKA. Beam power at the target = 0.704 W

• Particles per cm^2 per second in terms of 1-MeV neutron equivalent in Si estimated with FLUKA simulation (Photon beam power at target = .704 W)

Total	Neutrons	Protons	Pions	Electrons	Positrons
22.91 ± 0.18	18.04 ± 0.12	1.72 ± 0.03	1.80 ± 0.01	1.0 ± 0.2	0.19 ± 0.03

• Neutron flux in terms of 1-MeV equivalent neutrons in Si estimated with Geant simulation: 30.5 cm^-2 sec^-1.

• FLUKA geometry and input files: http://www.jlab.org/~georgek/halld/