Elegant users forum

Chao,

I see that the emittance initially increases, then goes down. Can you check to see if particles are lost from the simulation?

--Michael

Esraa,

You can add a chirp (R65 nonzero) and compression (R56 nonzero) using EMATRIX elements. Please see attached files for an example

When optimizing both the chirp and R56, you'll want to place reasonable limits on the maximum allowable energy spread and R56.

--Michael

Samira,

It might be because your path does not include your present working directory. You can either add it to your path, or modify setUpCases as to change "setUpCase" to "./setUpCase".

--Michael

Samira,

Looking at your files, I don't see how the SREFFECTS element gets set up.

--Michael

Siwei,

I think the MRFDF (multipole rf deflector) element should do it. You can set up rf multipoles from dipole to decapole.

--Michael

Monika, I was able to reproduce this error. I'm not sure why I didn't see it before. The problem is that you have a WATCH element in the beamline while doing a DA search. This causes some confusion in the code about the length of the table necessary to store the data. I'll see what I can do to fix t...

Samira, It is hard to comment without having the input particle distribution. If it has a time-momentum correlation of the right sign, then having larger R56 could easily result in a shorter bunch. Also, be careful to look at St rather than Ss. As explained here , Ss is the spread in distance travel...

Version 2025.3 has been released. Changes are detailed in the manual.

It includes several bug fixes and enhancements, the most significant of which is the addition of intrabeam scattering calculations using the diffusion matrix approach of Kubo and Oide.

--Michael

Version 2025.3 has been released. Changes are detailed in the manual.

It includes several bug fixes and enhancements, the most significant of which is the addition of intrabeam scattering calculations using the diffusion matrix approach of Kubo and Oide.

--Michael

IBS can also transfer momentum between planes, e.g., from transverse to longitudinal, so this isn't impossible. I guess it might be more likely in a ring in which most of the scattering occurs at locations with small dispersion, but I'm just hand-waving here. Do you get similar results if you fix th...