Colwyn Gulliford

Initial CNSGA pop size is wrong in working example

3

I ran a real test case of the latest Xopt using the dev setup. The example is a dcgun tracked with GPT, optimizing the emittance out of the gun vs....

In running Xopt with a population file I noticed I can't use ENV variables in generator:population_file key in the Xopt yaml file: ``` generator: name: cnsga population_size: 320 output_path: /global/homes/c/cgull12/m3645/cgull12/cooler/pc/in2mg/v2...

The openPMD BeamPhysics extension has several optional str parameters that can be used label/describe a Particle Group: For example: ``` latticeElementName type: Optional (string) description: The name of the lattice...

Currently ParticleGroup only allows one species in a given group, however many tracking codes allow multiple species to be tracked simultaneously.

Example beam attached with spurious .txt in filename [nan_beam.h5.txt](https://github.com/ChristopherMayes/openPMD-beamphysics/files/11790073/nan_beam.h5.txt)

It would be convenient for some lume-GPT user if the (total) E&B fields evaluated at each particle position could be handled by openPMD-beamphysics. The user would plot the field coordinates...