Elegant users forum

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...

Tiansk,

We have recently implemented the diffusion matrix method of computing IBS (Kubo & Oide, PRST-AB 4, 124401 (2001)). I hope to release this in the next few weeks.

At present, it is for the beam moments computation only, but I plan eventually to use the same method for tracking.

--Michael

Tiansk, I don't think transforming to a round beam addresses the fundamental issue with the smooth=0 simulation, namely, that it attempts to model (x', y', delta) scattering from a section of a beamline with kicks at a particular location. The right way to address this is to accumulate a scattering ...

I downloaded your files and they work without errors. Perhaps try the latest version of the code?

--Michael

Zhenbiao, Elegant does not have that capability. There are some similar capabilities that might get you some of what you want: 1. RFTMEZ0 allows simulating a TM-mode rf cavity specified by the on-axis Ez field. 2. SHRFDF allows simulating a deflecting cavity using space harmonics. 3. SCRIPT allows i...