Elegant users forum

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...

Tiansk,

Could you provide your input files so I can check the results?

In general, I recommend using smooth=1 because otherwise you inject additional noise into the simulations.

--Michael

Zhenbiao, Operationally, the way to handle this is to perform beam-based-alignment (BBA) so that you know the BPM offsets relative to nearby quadrupoles. In a simulation, you can mock this up by assuming that the BPM offsets are small. How small is determined by the anticipated accuracy of the BBA. ...

Version 2025.2 has been released. It features several bug fixes and some new features. Details are in the manual.

--Michael

Version 2025.2 has been released. It features several bug fixes and some new features. Details are in the manual.

--Michael

Monika,

I don't see anything obviously wrong with the processed file. Can you upload the input file you are using with geneticOptimizer?

--Michael