4.16 define_snapshots

• description: Requests beam snapshots at equispaced time intervals. These snapshots contain the spatial and momentum coordinates of all particles.
• example:
  &define_snapshots  
      filename = "gunRun.snap",  
      time_interval = 0.1e-9  
      start_time = 2e-9  
  &end

  This command results in snapshots being taken every 100ps starting at time 2ns, with data going to gunRun.snap.

• synopsis and defaults:
  &define_snapshots  
      STRING filename = NULL;  
      double time_interval = 0;  
      double start_time = 0;  
  &end

• details:
  • filename: The name of an SDDS file to which to write the snapshots.
  • time_interval: The interval in seconds between successive snapshots.
  • start_time: The time in seconds at which to make the first snapshot.