undulators in polychromatic mode (bugs, further developments and tips) #33
Description
When calculating an undulator in polychromatic mode,
- is not possible to add the effect of Energy spread. This option works only for monochromatic source. Polychromatic source with energy spread is left for future development. Set Energy Spread=No:
- Watch out for the parameters for sampling the source size. If the internal code is used, the "Source for backpropagation" = "Reused (from polar)" has a BUG. Please use "Recalculated", it is also more accurate (so recommended for general use)!
If using backpropagation for sampling the source size, as we do, it is convenient to have a look at the Undulator Plots/Backpropagated radiation. It looks quite strange a it has unphysical side rings:
You can play with the magnification and weight it to remove the side peaks:
This setup gives a reasonable ray distributions:
OASYS workspace is here (please rename txt to ows):