Polarization components from EPU

[Arcus-Sinus]

Hello,
Is there any way to calculate the polarization components of the EPU (APPLE II)?

Namely, e.g. you set the undulator to circular polarization but it never really is 100% of the flux in some harmonics.

And maybe possible to make a scan of flux in different polarizations versus the phase of the EPU?

Thank you in advance for any possible reply.
Kind regards,
Tomasz

[srio]

Hello,

you can do scans extracting the XOPPY script and modifyoing it to make loops on the scanning variables.

Unfortunately I do not have experience with helical undulators and I have not tested the apps in XOPPY. However, most of the undulator calculations rely in SRW, and I believe it can correctly calculate your undulator. What we do in XOPPY/Undulator spectrum is just a layer on top of SRW to pass the parameters.

The XOPPY script does not create the native SRW script but uses xoppy_calc_undulator_spectrum in
https://github.com/oasys-kit/xoppylib/blob/main/xoppylib/sources/xoppy_undulators.py . For the spectra (1d scans) it calls calc1d_srw in https://github.com/oasys-kit/xoppylib/blob/main/xoppylib/sources/srundplug.py

Hope this helps.