Question on bunch frequency

[ZY Song]

I have a question regarding the bunch frequency setting. I have read some previous discussions on the forum, but I am still not fully clear about it.
My current understanding is that this parameter is related to the space-charge calculation. Therefore, I would like to ask:
1.Are there any recommended guidelines or rules of thumb for choosing this parameter?
2.Can it be determined based on certain beam properties (such as beam size, energy, etc.) to ensure a reasonable range?
Looking forward to your reply!

[Didier]

This question really only arises in the case of DC beams; otherwise, you need to specify the frequency of your RF structures.
For DC beams, for meshing reasons, it is preferable to choose the frequency so that the longitudinal size in metres is of the same order of magnitude as the transverse dimensions.

Regards,

Didier