4.18 define_field_saving

• description: Field saving refers to writing the simulation fields to disk in such a way that they can be reloaded in subsequent runs. At this time, it saves only the time-dependent field components, not the external fields defined with define_solenoid or constant_fields.
• example:
  &define_field_saving  
      filename = "gunRun.fsave",  
      time_interval = 1e-9,  
      double start_time = 5e-9  
  &end

  This command results in saving of the fields at 1ns intervals starting at simulated time of 5ns to file ”gunRun.fsave”. Successive saves are placed in successive SDDS pages.

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

• details:
  • filename: Name of an SDDS file to which to write the field saves.
  • time_interval: Simulated time interval in seconds between successive saves.
  • start_time: Simulated time at which to make the first save.
  • save_before_exiting: Flag requesting that a save be made just prior to program termination.