Elegant users forum

Monika,

I tried version 2026.2 (the latest) and it works fine with the attached lattice file.

--Michael

Amal, The main problem is that the TWLA elements are not set up using phase references. If you break a structure into cells, you should use a phase reference to ensure consistent phasing. See the attached file. Even after fixing that, there are problems finding the matrices of the TWLAs, which preve...

Michael,

This should be fixed in the latest release (2026.2)

--Michael

Version 2026.2 has been released. This is a significant upgrade with the inclusion of a spin-tracking option. Several bugs were also fixed. Details are available in the manual.

--Michael

Version 2026.2 has been released. This is a significant upgrade with the inclusion of a spin-tracking option. Details are available in the manual.

--Michael

Monika,

You can use the acceptance values and beta functions from the twiss_output file for BSC computation. The acceptance includes the effect of optics and orbit.

See attached example.

--Michael

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