Elegant users forum

Hi, I am running Mac OS 10.15.7, and I wound up getting elegant and SDDS to install by using homebrew to install motif: brew install openmotif Before I tried that, I did brew install --cask xquartz which helped with some errors but wasn't enough. I'm not sure if openmotif will include xquartz or if ...

If you want to keep the aperture constant until the transitions, you can try this for the aperture file, giving the downstream aperture and then the upstream aperture at each transition point. That should also make everything work if you want to track particles backwards. Sounds like the manual need...

I am having trouble using the touschek_scatter on some lattices with large errors. When I calculate the momentum aperture, it is significantly worse than the nominal machine, but looks like what I expect. There is also good agreement with calculations done with AT. However, when I do the lifetime ca...

Thank you, that did the trick!

-Gregg

Hi, I'm seeing a large discrepancy between tracking with and without REFERENCE_CORRECTION in CSBEND elements, when there is also an epitch or eyaw misalignment. The case with REFERENCE_CORRECTION=0 seems like a closer fit to AT calculations, and the final offset is much smaller which seems more reas...

Thanks Michael, that clarifies things a lot!

-Gregg

Hi, I am doing comparisons between AT and elegant tracking, and now I want to compare the closed orbits. With rf turned on and with deterministic synchrotron radiation losses, AT has a function "findorbit6" which calculates a closed orbit that includes the variation in energy, and I think it also re...

Hi, I just spent a lot of time tracking down a mistake that involved setting CHANGE_T=1 on a 3rd-harmonic RF cavity. Even though it's a harmonic of the fundamental RF, the time that is subtracted from particles can easily be 1/3 or 2/3 of the period of the main RF, giving big phase errors. And it's ...

Hi, I have noticed an issue where if I run frequency_map on a lattice that starts with a CHARGE element, it quickly generates a segmentation fault (message is: Terminated by SIGSEGV). Attached is a simple example based on the example given in PAR/frequencyMap It's very easy to just not have the CHAR...

Michael,

Having the steering available in CSBEND would help me a lot.

I was wrong about there being a problem combining Fn and Kn, I must have changed multiple things at once and blamed it on that particular aspect of the lattice when it didn't do what I expected.

Thanks,
Gregg