# Run Time

Run Time controls how long the simulation evolves electromagnetic fields.

See tidy3d.Simulation.run_time (opens new window).

Set run time from: Choose how the GUI sets the simulation run time.

  • Options:
    • Global Frequency
    • Quality/Source Factor
    • Manual

# Global Frequency

Use the center frequency from Global Settings to set the run time.

Run time: Run time computed from the global center frequency.

  • Type: floating-point number
  • Unit: s, ms, us, ns (default unit), ps, fs

# Quality/Source Factor

Use source and quality factors to set the run time.

source_factor: Multiplier applied to the longest source time.

  • Type: floating-point number

quality_factor: Expected quality factor of the device.

  • Type: floating-point number

# Manual

Enter the simulation run time directly.

run_time: Total electromagnetic evolution time.

  • Type: floating-point number
  • Unit: s, ms, us, ns (default unit), ps, fs

# Advanced

shutoff (Early shutoff threshold): Ratio of the instantaneous integrated E-field intensity to the maximum value at which the simulation automatically terminates time stepping.

  • Type: floating-point number
  • Constraint: greater than or equal to 0
  • Default: 1e-5

Set to 0 to disable automatic shutoff.

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