Geant3 (How to)

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Geant3 Simulation

The simulation package can be found here (Where should I put it?)

The package needs to run on ifarm1101

Simple kumac with visualization

• >./comg_inter.exe
• >exe gmag_test

How to get analyzing power

• >paw (workstation 3)
• >exe azz

• This produces an output called azz.dat

azz.dat

Q1    Q2    Q3    Q4   Dipole theta(RMS)  phi(RMS)  #sim  singles   COIN      Azz    Azz err  singles(mean left arm)  Holding Field 

-1.19  1.75  0.51  1.73   6.74    9.53       0.33    100000.  64193.  59208.  0.7460    0.411      90.210                  3.00

-1.19  1.75  0.51  1.73   6.74    9.37       0.33    100000.  63526.  58107.  0.7472    0.415      90.112                  3.00

-1.19  1.75  0.51  1.73   6.74    8.43       0.33    100000.  59737.  49799.  0.7530    0.448      89.621                  3.00

Histograms

Most of the kumacs calls fill.kumac which produces omgeant.his and creates the following histograms

 1001 (1)   siglg.f(2,1,8)  
      1010 (1)   Theta initial   
      1011 (1)   Theta left arm  
      1015 (1)   Theta left arm   efficiency 
      1012 (1)   Theta right arm 
      1016 (1)   Theta right arm  efficiency 
      1013 (1)   Theta coincidence   
      1017 (1)   Theta coincidence    efficiency 
      1020 (1)   Phi initial 
      1021 (1)   Phi left arm
      1025 (1)   Phi left arm efficiency 
      1022 (1)   Phi right arm   
      1026 (1)   Phi right arm    efficiency 
      1023 (1)   Phi coincidence 
      1027 (1)   Phi coincidence  efficiency 
      1030 (1)   Analyzing power initial 
      1031 (1)   Analyzing power left arm
      1035 (1)   Analyzing power left arm efficiency 
      1032 (1)   Analyzing power right arm   
      1036 (1)   Analyzing power right arm    efficiency 
      1033 (1)   Analyzing power coincidence 
      1037 (1)   Analyzing power coincidence  efficiency 

How to get Levchuk correction

The simulation needs to be run three times. One for scattering off of each shell M (free e-), L and K.

• >paw (workstation 3)
• >call sim_levch.f(N1,N2,N3,K1,K2,K3)

Where N1,N2,N3 are the number of simulated events and K1,K2,K3 and the number of coincidence from the simulation for the M(free e-), L, and K shells respectively.