How to mitigate the effect of the electric field at the absorption boundary？

[1120805582]

Hello, I now want to inject a piston on the left boundary, interact with the background plasma and magnetic field, and perform boundary absorption spectrometry on the right boundary to simulate the time integrating electron spectrometer in the laser experiment. Since I opened the absorption boundary, the deletion of particles may have caused a strong electric field at the right boundary, which will affect the particle diagnosis at the boundary. I would like to ask if there is a good way to reduce the influence?

Thank you！

[RemiLehe]

Thanks for raising this issue.
I think that in order to answer this, we would need more details on the specific parameters of this simulation.
Would you be able to share the corresponding input script? Thanks.

[1120805582]

Hi, thank you for your reply.
In my current input Settings, I set the piston plasma moving to the right in the simulation domain 0 to 3/8, the upstream plasma with external magnetic field is set in 3/8 to 7/8, and 7/8 to 1 is blank.
In order to generate collision-free shock waves based on the magnetic piston mechanism and diagnose the electron acceleration, because in the high-power laser experiment, we used the time-integrating electron magnetic energy spectrometer to carry out the diagnosis, so I turned on the boundary absorption electron diagnosis in diag5, and obtained a good electron energy spectrum. However, tracking the high-energy electrons by diag4 was frustrating to find that almost all of the extremely high-energy electrons were accelerated near the boundary (which was blank in the initial setup). Finally, I think it is the strong charge separation field caused by boundary absorption of particles that significantly affects the electron acceleration process.
I wonder if I can give some suggestions to improve the simulation Settings or reduce the electric field effect. Thank you!
shock_input (2).txt