Elegant users forum

I'll have to look into why that term is missing. Meanwhile, you can add "TRACKING_MATRIX=2" to the definition of the KQUAD element to get a tracking-based matrix, which includes this term. I suppose that other R5X and RX6 terms will also change as a result. One thing to be aware of in comparing to o...

Gregg, Unfortunately, that feature is not supported for the parallel version, although you have no way to know that from the manual. Those messages indicate that each processor is trying to open the same file, and failing. I'll put it on my to-do list to provide parallel support, although I wouldn't...

After a little more looking, I've concluded that this isn't a bug, but rather a result of the presence of linear and nonlinear coupling, through tilted quadrupoles and sextupoles, respectively. Elegant alternates between correcting in the x and y planes. With n_xy_cycles=1, it corrects the x plane, ...

NuanYa, You need to ask for orbit correction in order to get amplification factors. Try adding &correct mode = "orbit" n_xy_cycles = 1 n_iterations = 100 &end (In this case, n_xy_cycles = 1 is required.) I'll add a check so it doesn't crash. Thanks for the report. --Michael

Joe,

That would be pretty easy to implement, but I'm not sure when I'll get to it.

Meanwhile, it is easy to do with a SCRIPT element, which allows you to transform the particle distribution using an external program or script.

--Michael

This seems to be a bug that appears when n_xy_cycles=1. Set n_xy_cycles to 2 or higher in &correct and you should see consistency.

Thanks for reporting the problem.

--Michael

Ryutaro, I would be suspicious of this result. First, the convergence warning indicates that the normal algorithm had a problem. Second, you have tracking_turns=1, which asks elegant to use a fall-back multi-turn tracking method; however, you only asked it to use 1 turn, which isn't reliable. It som...

Version 2023.4 has been released, with several feature and performance improvements. See the change log in the manual for details.

--Michael

Mikhail, Regarding the issue with helical devices, it is not so much a bug as an unavoidable limitation. In a planar device, if we want a wiggler to generate zero orbit offset and zero dispersion, we need to start and end with half-length poles. The field is assumed to have the peak value at the sta...

Mikhail,

The "sum rule" is only correct when Jx=1. If Jx>1, the sum of the emittances is always greater than the natural emittance.

--Michael