Elegant users forum

Ji-Gwang,

I tried the files I uploaded on a Windows 11 machine from the cygwin shell using the latest 64 bit versions from our web site. It ran without any issues. I'm not sure what to suggest. Perhaps try another machine?

--Michael

Version 2023.1 of elegant has been released. There are several important bug fixes and feature enhancements.

Details are in the manual.

--Michael

There are various ways to determine the initial twiss parameters. For example, sometimes there is an upstream transport line or segment of a ring that defines them. Sometimes we use the twiss parameters appropriate to a particle beam that we expect to be delivered to our system. In other cases, the ...

Ji-Gwang,

I can't duplicate the problem with version 2022.0. I've attached my files.

--Michael

Chao, This is outside my expertise, but I understand that there are various methods to transform a digital filter into an analog equivalent and vice-versa. In our 2015 IPAC paper on rf feedback, my colleague Tim Berenc recommends using a bilinear transform. The reference is to M. Santina et al. W. S...

Ji-Gwang,

Thanks for the lattice file. Can you also post the .ele file?

--Michael

The problem is that the tracking.ele file isn't constructed correctly to generate the .twi file. See the attachment for a file that should work. (Basically, requesting a twiss output file during an optimization isn't supported. It has to be done after the optimization in a second sequence.) --Michael

Perhaps this post will help
viewtopic.php?f=9&t=857

--Michael

The reason for this is that your beam line contains dipole magnets with small bending radii. There are sextupole-like terms present in such magnets due to the small radius of curvature of the coordinate system. This results in distortion of the phase space, which shows up as a small centroid error. ...

Ji-Gwang,

There may have been some changes in orbit correction methods that affect your simulation. However, without the files I can't tell.

Please upload all the files necessary to reproduce the problem.

--Michael