Remi Lehe comments

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                                            Remi Lehe

Optimizing GPU acceleration of binary collision algorithms.

@roelof-groenewald Thanks a lot for doing these tests! This is great news!

New Implicit Solver interface with options to select Picard or Newton (JFNK) for the nonlinear solver.

@JustinRayAngus Sorry for the delay in reviewing this PR. I am finally giving it a finally round of review. In our discussions, I think that we considered moving some of...

New Implicit Solver interface with options to select Picard or Newton (JFNK) for the nonlinear solver.

Thanks a lot for this PR!!

SIGABRT in Yee method with divE_cleaning = 1 and divB_cleaning = 1

Thanks for reporting this issue. Could you share the input script for which you observed this error?

SIGABRT in Yee method with divE_cleaning = 1 and divB_cleaning = 1

Also @zhazhajust, could you check whether this change fixes the issue: https://github.com/ECP-WarpX/WarpX/pull/4557/files

Are particles with negative IDs participating in binary collisions?

Now I also wonder if these particles also participate in the charge/current deposition: https://github.com/ECP-WarpX/WarpX/blob/development/Source/Particles/Deposition/ChargeDeposition.H

Are particles with negative IDs participating in binary collisions?

A potential solution would be to call a local `Redistribute` (i.e. only removes particles with negative IDs, but does not do MPI exchanges) after each process that might remove macroparticles:...

Are particles with negative IDs participating in binary collisions?

Fixed by #4744, which now calls a local `Redistribute` after all binary collision processes that can create new particles.

is there a binary collisional ionization feature?

Thanks for your question. Unfortunately, we currently do not have a module for collisional ionization that works with non-background species. (The "pairwisecoulomb" module only captures Coulomb collisions, but not ionization.)...

is there a binary collisional ionization feature?

As a quick note here: one we start implementing collisional ionization, we may consider the following references for the calculation of cross-sections: - [Perez, 2012](https://pubs.aip.org/aip/pop/article-abstract/19/8/083104/108747/Improved-modeling-of-relativistic-collisions-and) - [Guerra, 2013](https://www.sciencedirect.com/science/article/abs/pii/S1387380613000729) If others...