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• Login to Rivanna (https://ood.hpc.virginia.edu/pun/sys/dashboard)
• Create a folder to submit your jobs from on /project/ptgroup/ or /project/UVA-Spin
• The scripts to generate Monte Carlo (MC) events on Rivanna are in: 

  /project/ptgroup/work/MC_Generation

  You can make more and store the generating scripts here but label them in a way that is easy to understand.  The present naming convention is <Exp>_<channel>_<vertex origin>
  • Option for <Exp> are 906 or 1039.  The Geant4 geometry is different for the setup of E906 and E1039, so for SpinQuest make sure you are using the E1039 geometry.
  • Option for <channel> are : Drell-Yan (DY), Jpsi (JPsi), Psi' (Psip) Pion background (Pion), Kaon background (Kaon), Random-multi muons (MultiMuon), Single Muons + or- (SingMup/m)
  • Option for <Vertex origin> : target (Target), Beam Dump (Dump), Everything that seen by the beam (All), The gap between the target and dump (TargetDumpGap), and arbitrary vertex origin (Manual, should specify numbers such as x,y,z→25,25,100 would be a target size with diameter 25cm and 100cm long.
• You can copy any MC scripts to your directory to submit.  The scripts to generate Monte Carlo (MC) events on Rivanna are in: 

  /project/ptgroup/work/MC_Generation

  Example of copying: cd /project/ptgroup/YourFolder

  rsync -av --exclude scratch /project/ptgroup/work/MC_Generation/DY_Target_script .

  
  

  We will keep track of all MC generation scripts so we can all see how a particular MC batch was produced.  Details of each one should be kept in ReadMe in that directory.
• Other MC configurations you make that are not included in this directory you should copy over and make a note about so other people can use it as well.
• To summit you jobs to produce the MC navigate to the directory where you want to run the script.
• Setup the environment using: source /project/ptgroup/spinquest/this-e1039.sh  command
  

• Submit your job using the following command.
  $./jobscript.sh<Outpu{t}_{f}olde{r}_{n}ame>\; <\mathrm{Number\; of}{}_{j}obs>\; <\mathrm{Number\; of\; Events\; per\; Job}>\; For\; example:$./jobscript.sh DY_Target_1M  100  10000       (Here we need to generate ~1M events. The accepted events depend on the channel). Strongly recommended not to exceed 10K events per job.

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Here you can change the muon to mu+ or mu-, or change the or change the vertex interaction volume, for example this one creates a cylinder 1m radius around the beamline from 700 cm upstream of the dump to 100 cm inside the dump.

• Beam profile
  • The profile here means the distribution shape of beam protons in X and Y (= R). 
  • When "legacyVtxGen = true"
    • The shape is "Gaussian" at "R < 5*sigma" and "1 / R" at "R >= 5*sigma" (cf. https://github.com/E1039-Collaboration/e1039-core/blob/master/generators/E906LegacyVtxGen/SQPrimaryVertexGen.C#L290 )
    • The Gaussian width ("sigma" in cm) is defined by "SIGX_BEAM" and "SIGY_BEAM" in Fun4Sim.C.
  • When "legacyVtxGen = false"
    • The shape is defined by the following functions of event generators.
    • "set_vertex_distribution_function()" sets the shape to "Uniform" or "Gaussian".
    • "set_vertex_distribution_mean()" sets the mean of the distribution.
    • "set_vertex_distribution_width()" sets the half width in case of "Uniform" or "sigma" in case of "Gaussian".
• Distribution of z-vertex
  • The z-vertex means the position of each generated event in Z.
  • When "legacyVtxGen = true"
    • The distribution shape follows the probability of beam-material interaction, namely the product of beam intensity and material amount at Z, where the beam intensity is attenuated over Z.

    • When "VTX_GEN_MATERIAL_MODE" is set to "Target" (via rc->set_CharFlag("VTX_GEN_MATERIAL_MODE", "Target")), events are generated only on the target material.

    • "VTX_GEN_MATERIAL_MODE" can be set to "Dump" or "TargetDumpGap" to enable only the dump material or the material (i.e. air) of the gap between the target and the dump.
  • When "legacyVtxGen = false"
    • The distribution shape is defined by "set_vertex_distribution_function()" etc. together with the beam profile.