The OPAL Discussion Forum

["Adelmann Andreas (PSI)" <andreas.adelmann AT psi.ch>]

Hi Anastasia can you attach a example, showing your problem?
A

> On 19 Dec 2019, at 02:51, Anastasia <anastasia.ierides AT varian.com> wrote:
> 
> Hello all,
> 
> As a tutorial, I am trying to model a linear accelerator as a beam line of
> separate RF cavities rather than the whole LINAC geometry as one RFCavity
> element. I have run the simulation both with a single RFCavity element and
> with multiple cavities, wherein the dimensions are appropriately defined in
> the field map files, such that the elements are right next to each other 
> with
> no space in between.
> 
> In the single element simulation, the refence particle electric field is
> observed to depict expected behavior in the defined geometry, but in the 
> case
> of separate elements, there seems to be an additional “space” that is added
> between the individual elements, extending the overall geometry to almost
> twice the length. Could this be a mistake on my part in my input files, 
> etc.,
> or is there something in the code that by default forces this type of
> behavior? For instance, in a situation where elements are too close 
> together,
> are they forced to have some minimal distance between them, etc.?
> 
> I guess the first question should be, does OPAL allow for the capability to
> model a whole geometry as separate, yet connected RFCavity elements?
> 
> Any help in this would be greatly appreciated.
> 
> Thanks!