Elegant users forum

Dan,

I think what the three-cell simulation is telling you is that the distances between the cells is not right for the (variable) velocity of your beam. Given that, there isn't much you can do if the structure is already built, beyond using phase shifters for two of the cells.

--Michael

Samira, Yes, apertures will be included in the Touschek lifetime calculations via the local momentum acceptance. However, in your simulation you only added vertical apertures, plus you have no errors. In that case, it isn't surprising that the effect is small because of the lack of coupling of horiz...

Michael,

I confirmed this bug for &save_lattice with output_seq=1 and will look into fixing it. If you can use output_seq=0, that works as expected.

--Michael

Chao,

I'm not exactly sure why that happened, but it seems related to how you inserted the TSCATTER elements. I've attached modified files that work as expected.

--Michael

There are two openings for assistant physicists at APS that may be of interest to those on this forum: The first is for an accelerator physicist specializing in storage rings Assistant Physicist — Accelerator The second is for someone with experience applying AI/ML to accelerators Assistant Physicis...

Version 2026.1 has been released, with a number of bug fixes and feature enhancements, as described in the manual.

--Michael

Version 2026.1 has been released, with a number of bug fixes and feature enhancements, as described in the manual.

--Michael

Siwei, To connect B2 to a more familiar quantity, we can start with equation 100 and 101 in the manual. This tells us that the peak change in x' is dx'= x*e/(m*c^2)*(2*B2)/k/pz. In an ordinary thin quadrupole, we have dx'=x*K1*L. Hence, B2 = pz*K1*L*k/2 * (m*c^2)/e. Note that pz=betaz*gamma. The uni...

Bjorn, That's a very old bug that went unnoticed for years, since elegant is rarely used for such low values of momentum. The error is that some loss mechanisms result in caching of gamma instead of p=beta*gamma. I'll fix this in the next release, along with adding pCentral to the parameters. In the...

Monika, We did a comparison of AT and elegant several years ago and found good agreement in the LMA. https://journals.aps.org/prab/pdf/10.1103/PhysRevAccelBeams.22.114601 However, we didn't compute the Touschek lifetime for each case and unfortunately, I don't have those files any longer. The Tousch...