tidy3d.RunTimeSpec

class RunTimeSpec

Bases: Tidy3dBaseModel

Defines specification for how long to run a simulation when added to Simulation.run_time.

Parameters:

• quality_factor (PositiveFloat) – Quality factor expected in the device. This determines how long the simulation will run as it assumes a field decay time that scales proportionally to this value.

• source_factor (PositiveFloat = 3) – The contribution to the run_time from the longest source is computed from the source_time length times source_factor. Larger values provide more buffer at the expense of potentially giving run_time values that are larger than needed.

Notes

The evaluated run_time will be computed from a RunTimeSpec() as follows:

\[\text{run_time} = \text{source_factor} * T_{src_max} + \text{quality_factor} n_{max} L_{max} / c_{0}\]

Where: source_factor and quality_factor are fields in the spec, \(T_{src_max}\) is the longest time that a source is non-zero, \(n_{max}\) is the maximum refractive index in the simulation, \(L_{max}\) is the distance along the largest dimension in the simulation, and \(c_0\) is the speed of light in vacuum.

Attributes

quality_factor
source_factor

quality_factor

source_factor