Simulation questions : SixTrack for diffusion calculations

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Simulation questions SixTrack for diffusion
calculations

• Natalia Abreu
• Mini Workshop in Electron lens Simulation
• December 3rd 2008

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Modifications

• The starting point uses basically all the
  modifications presented by Guillaume and Yun (use
  of more than 64 particles at a time, etc)
• The output file with the coordinates of each
  particle at each turn is disabled (for 105 turns
  it would mean output files of the order of
  GBytes)
• A new DO loop is added so that for every turn the
  rms spread of the action of the 64 particles
  packs is calculated and every 100 turns this 64
  rms values are averaged and printed on a new
  output file.

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Capabilities, input/output, limitations

• The code gives as output a much smaller file
  which has the data needed for the diffusion
  calculation, made simple if we define it as
• The input files are the same ones used for the
  long-term calculations fort.2, fort.3, fort.16
  and a file with the initial distribution of the
  tracked particles in phase space (6D)
• From diffusion calculations it is possible to run
  a job of 640 particles (10 packs of 64 particles
  with the same initial action) and 105 turns in
  about 8-10 hours in a conventional PC.
• This is limited by the fact that SixTrack runs 64
  particles at a time but is easy to overcome.

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Diffusion Plots