Elegant users forum

Mikhail,

The formula you quote is incorrect when the horizontal damping partition number Jx is not 1. The correct formula is ex=ex0/(1+K*Jy/Jx), ey=K*ex.

For example, for APS-U we have ex0=44.3 pm and Jx=2.21. With K=1, we get ex=ey=30.5 pm

--Michael

Ryutaro,

You can get the matrices from the matrix_output command. It provides the option for a text file or an SDDS file.

--Michael

Weijie, It is puzzling that they don't agree, then. The CWIGGLER element uses the code developed by Ying Wu for AT many years ago. If you are just using sinusoidal mode, you could check the vertical tune using tracking and compare that to the twiss parameter calculation. They should agree closely. -...

Ryutaro, The problem is that the phi values are not sufficiently precise. Maybe they originated in a single-precision calculation or limited-precision printout. You can fix this using sddssnap2grid DIC_C17_cydrincalcood.sdds DIC_C17_cydrincalcood.snap -col=phi,max=3600 This command will look at the ...

Pradeep,

There's an up-to-date example in the examples file, which you can obtain from our software download page, or at https://ops.aps.anl.gov/cgi-bin/oagLog4 ... les.tar.gz

Look for PAR/elasticScatteringTracking and PAR/inelasticScatteringTracking.

--Michael

I found a few problems in your files: * You had the WEIGHT parameter step to 0 on all the monitors. This causes them to be ignored. I set the value to 1. * You defined HC and VC as KICKER elements, then placed them one after the other in the lattice. Since these correct in both planes, it means you ...

I'm not able to replicate these issues. Can you post some files that demonstrate the problems?

Thanks--Michael

The recommended way to set up the single-turn matrix is using the ILMATRIX element, since it allows including details (such as chromaticity) in a fashion that is appropriate to long-term tracking. You can find a guide to doing this in the examples files, under ILMatrixFromTracking. Once you've done ...

Weijie,

I can't comment on why AT and elegant give different results in this case, since I don't use AT. We did a comparison of AT and elegant for the APS upgrade, and the results were very similar.

https://journals.aps.org/prab/abstract/ ... .22.114601

--Michael

The CSV file is still not quite right. You have 202 distinct x values. Most are separated by 0.1 mm and have 201 occurrences. However, the value 0 appears 7 times and the value 2.22e-15 appears 201 times. You have 203 distinct y values. Most are again separated by 0.1 mm and have 201 occurrences. Ho...