The OPAL Discussion Forum

[Ryan Roussel <roussel AT g.ucla.edu>]

Hello Jimin,  

I am also working on the same problem, modelling the AWA EEX beamline at Argonne. I played around with your files and I would also like to point out that your time step is rather large at 10 ps. I was able to solve the "beam splitting" issue by reducing the time step to 1 ps. If you would like to collaborate our efforts shoot me an email.

Ryan

On Sat, Mar 17, 2018 at 10:49 AM Christof Metzger-Kraus <christof.j.kraus AT gmail.com> wrote:

Hi Jimin,

the problem is, that the entrance and exit fringe fields overlap. Sofar the algorithm that adapts the default field map to a specific dipole doesn't check whether they overlap. In future versions this will be fixed (working on it). In the meantime you should use manually adapted field maps, see attachment.

I've also attached you a plot that was generated with the current development version of OPAL. It shows regions where particles are considered being inside elements. The eight dipoles should be easily recognizable. Does this layout correctly represent your lattice?

Best regards

christof

On Wed, Mar 14, 2018 at 7:05 AM, 석지민 <connecter123 AT gmail.com> wrote:

Dear opal team

Hello, I'm jimin Seok, South korea. 

These days, I'm using OPAL-T for EEX baemline, but there is a problem.

I generate 6D gaussian beam and put in EEX. But, after dipole, beam becomes strange. I couldn't find the reason of this problem. I attach my input files and a few pictures in zip file.

Please let me know what is wrong thing about this problem.

The version of OPAL is 1.6.1-3.

Sincerely yours

Jimin Seok