SHMS Single arm Monte Carlo

Source code

• mc_shms_single_mar2012.tar.gz is the tarball.
• On JLab ifarm64 machines execute : "setup cernlib/2005" before doing "make"

Comments on code

• Designed to be used for studying optics and acceptance of the SHMS.
• Materials hit when multiple scattering flag turned on.
  • Target
    • When target length greater than 3cm, assumes a beer can target with diameter of 3.37cm and wall thickness of 0.005 inches
    • Need to enter the radiation length of target material in the input file.
  • Scattering chamber window is 0.016inches of aluminum
  • 15 cm of air between scattering chamber and snout. Since snout is not designed this is a guess.
  • SHMS entrance window is 0.020 inches of aluminum.
  • SHMS exit window is 0.020 inches of aluminum.
  • Three options for after the SHMS exit window
    • Argon/Neon Cerenkov. Set the cer_flag=1 ( line 22 in input file). The vac_flag ( line 23 in input file) is ignored.
    • Helium bag replaces the Argon/Neon Cerenkov. This is the assumed mode of option at low momentum. Set the cer_flag=0 ( line 22 in input file) and set the vac_flag=0 ( line 23 in input file).
    • For study, vacuum pipe replaces the Argon/Neon Cerenkov. Set the cer_flag=0 ( line 22 in input file) and set the vac_flag=1 ( line 23 in input file).
  • SHMS wire chambers
• SHMS wire chamber resolution is 200 microns
• SHMS collimator is in place and cuts events.
• Events cut if outside area of drift chambers, S1 and S2 scintillators and the calorimeter in mc_shms_hut.f.