Controlling the accuracy of ray tracing in a cathode simulation


In cathode simulations the value 0.001 is usually suitable for the 'fractional inaccuracy for ray tracing' and 0.0001 for the 'fractional inaccuracy for potentials used in ray tracing'. Smaller values are not usually warranted because cathode and space-charge calculations are inherently less accurate than non-space-charge simulations. Also note that the program usually uses a smaller inaccuracy for the near-cathode region than the user has asked for.


But special care is needed when using a cathode with an anode at high voltage