Use measured plasma density profile as input

[berceanu]

Does WarpX support using an experimentally measured plasma density profile as simulation input for LWFA scenarios?

[ax3l]

Not yet:

• Alternative method of particle initialisation from a file #3948
• Initialize plasma density from file #618

[pordyna]

@ax3l Hi! I would be also interested in this feature, but I have seen that one can initialize particles from openPMD. So I guess this would be possible to precalculate positions of all particles in beforehand and pass it via openpmd? Not a very efficient way, but would it work as a workaround?