diagnostic.field_data

[HLQzZ]

In diagnostic.field_data, do Psi represent to the the pseudo-potential of the wakefield?

[AlexanderSinn]

Yes. More information can be found here: https://arxiv.org/abs/2109.10277

Note that by default Psi does not include the contribution from the beam, as it is very small for ultra-relativistic beams. This can be changed with the input parameter hipace.do_beam_jz_minus_rho = true.