CEA Codes forum

Thank you. I fully understand! It is so kind of you, Nicolas.

Dear Didier, I am trying to simulate the transport of a long bunch. I encounter some problems with periodic boundary conditions. According to the TraceWin instructions: “When the bunch is not short compared to the intra-bunches distance, effect of neighbor bunches are taken into account and particle...

Dear Nicolas, Thank you! I get it now! I've been wrong. I have always tried to understand PICNIC as a numerical algorithm that solve Poisson equation with some kind of boundary conditions. Now I realize Picnic did not use a similar scheme. Now I almost fully understand Picnic. But I still have some ...

Dear Nicolas, I got it！Thank you very much! It is so kind of you! Your reply has solved my long-standing question. Before that, I did not known the boundary conditions used in Tracewin, so I tried to solve the open boundary problem with Professor JI Qiang's algorium（Computer Physics Communications 2...

Dear Nicolas, Thank you very much! I still have another personal question. When using Tracewin, we all marvel at the speed of the software. As far as I known, the Poisson equation with open boundary condition should be integrated to infinity by, Green function or some other methods. These methods wi...

Dear Didier, we are studying the effect of boundary on beam. According to the Instructions of Tracewin, the inner potential of the beam are calculated by solving Poisson equation. A particle-in-cell approach based on numerical-calculation of the interaction between cubes (PICNIC) is used. The PICNIC...