Using SIMC

SIMC repository and documentation

• SIMC short documentation

• SIMC on github

Brief Overview

• SIMC main inputs are

• • Beam energy
  • Spectrometers angles
  • Determination of which spectrometer detects electrons and which detects hadrons
  • Target parameters (A,Z,density etc.)
  • Generator acceptance and resolution

• The generator will generate events with the reaction 4 physical variables

• • in-plane angle y'
  • out-of-plane angle x'
  • y(target)
  • momentum difference from central spectrometer momentum - delta

• COSY simulation tool will generate the hrs_cosy file which include the transportation parameters for the particle along the spectrometer

• The output of the simulation would be the 4 physical variables reconstructed at the focal plane of each spectrometer

How to run SIMC

• compile SIMC directory: go to the SIMC directory, change what ever necessary in Makefile and type

 make

• create an input file under the directory infiles following the repository examples, e.g.

 infiles/hrsr_eep_h.inp

• execute SIMC with an input file, e.g.

 simc 
 (enter input file)> hrsr_eep_h

• after the run was completed 4 output files are generated

 outfiles/hrsr_eep_h.geni  (information)
 outfiles/hrsr_eep_h.hist   (run settings)
 outfiles/hrsr_eep_h.gen   (output text file)
 worksim/hrsr_eep_h.rzdat   (paw ntuple)

• convert the paw file into root

 h2root hrsr_eep_h.rzdat 

• a root file hrsr_eep_h.rzdat will now be generated. The tree is called h666, and the most important variables are the reconstructed 4 variables (hs-electron arm, ss-hadron arm) and those generates (add an i), e.g.

• • hsdelta , hsdeltai
  • hsytar , hsytari
  • hsyptar , hsyptari
  • hsxptar , hsxptari