Search found 38 matches

by GPenn
01 Jun 2022, 12:19
Forum: Installation
Topic: sddsplot issue in macOS 10.14
Replies: 8
Views: 13750

Re: sddsplot issue in macOS 10.14

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 ...
by GPenn
16 Feb 2022, 11:22
Forum: Bugs
Topic: Issue with the physical aperture
Replies: 3
Views: 3117

Re: Issue with the physical aperture

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...
by GPenn
05 Feb 2022, 16:23
Forum: Bugs
Topic: touschek_scatter calculation appears not to take closed orbit into account
Replies: 1
Views: 2254

touschek_scatter calculation appears not to take closed orbit into account

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...
by GPenn
07 Sep 2021, 21:58
Forum: Bugs
Topic: issue with reference_correction and epitch/eyaw misalignments
Replies: 2
Views: 2582

Re: issue with reference_correction and epitch/eyaw misalignments

Thank you, that did the trick!

-Gregg
by GPenn
27 Aug 2021, 12:23
Forum: Bugs
Topic: issue with reference_correction and epitch/eyaw misalignments
Replies: 2
Views: 2582

issue with reference_correction and epitch/eyaw misalignments

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...
by GPenn
13 Aug 2021, 17:53
Forum: Ring Tracking
Topic: "Six-dimensional" closed orbit
Replies: 2
Views: 595

Re: "Six-dimensional" closed orbit

Thanks Michael, that clarifies things a lot!

-Gregg
by GPenn
13 Aug 2021, 16:33
Forum: Ring Tracking
Topic: "Six-dimensional" closed orbit
Replies: 2
Views: 595

"Six-dimensional" closed orbit

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...
by GPenn
11 Nov 2020, 13:56
Forum: General
Topic: Word of warning about using CHANGE_T=1 in RFCA or RFCW elements
Replies: 1
Views: 4152

Word of warning about using CHANGE_T=1 in RFCA or RFCW elements

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 ...
by GPenn
03 Nov 2020, 18:16
Forum: Bugs
Topic: Minor bug with frequency_map, but causes segmentation fault
Replies: 1
Views: 5920

Minor bug with frequency_map, but causes segmentation fault

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...
by GPenn
18 May 2020, 16:39
Forum: Feature Requests
Topic: Uniform corrector fields in CSBEND element?
Replies: 2
Views: 6353

Re: Uniform corrector fields in CSBEND element?

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