CEA Codes forum

Yes, we are using multi-particle tracking (PARTRAN mode) rather than envelope calculations.

Thank you for your previous explanation. Following your suggestion, we updated the GAP definition by providing all four parameters related to the transit time factor, i.e.: βs, Ts, T′, and T″. In our current setup, we assign: βs: calculated from the synchronous particle energy at each gap Ts: obtain...

I have another question regarding the use of the thin-gap model in TraceWin. When I modify the transit time factor (TTF) value in the GAP elements, I observe that the simulation results (such as beam energy and other beam dynamics parameters) do not change at all. It seems that the TTF has no effect...

Thank you very much for your help and for providing the example file. This is very useful for me to compare with my own IH-DTL model and check where the problem may come from.

I have a question regarding the geometrical length definition when using the thin-gap model in TraceWin. Since the GAP element itself has no geometrical length, while in a real accelerating structure (e.g. a DTL) the accelerating gaps have a finite length, should the gap length be effectively includ...

In addition, the structure I designed is an IH-DTL, where the lengths of each cell (including both drift tubes and accelerating gaps) are determined by the synchronous phase distribution. Therefore, the cell lengths are defined through beam dynamics considerations rather than independent geometric p...

Regarding the difference in the total length between the two models, I would like to clarify the following: In the FIELD_MAP model, I use the full electromagnetic field distribution exported from CST, so the total length corresponds to the actual physical length of the entire accelerating cavity, in...

I built a DTL accelerating cavity model in CST. First, I integrated the axial electric field along the beam direction within each accelerating cell to obtain the effective accelerating voltage of each cell. These voltages were then used in a TraceWin thin-gap model for beam dynamics simulations, and...

I have a question regarding the definition of the “number of bunching cells” parameter in RFQ Designer. As far as I understand, an RFQ is generally designed using the classical four-section approach, namely: Radial Matching Section (RMS), Shaper (SH), Gentle Buncher (GB), Accelerator (ACC). In RFQ D...

The document is very helpful, and it has clarified the structure and meaning of the .vane file for me.

Thinks.