Elegant users forum

You should use the corrected emittance in the optimization, but also be sure that you are controlling the residual dispersion. In general for off-axis injection into a ring, you should match the dispersion at the end of the last septum or kicker to zero. For on-axis injection, match the dispersion t...

Pradeep,

I can't find that example. Can you post it?

--Michael

Wei-Hou, Your file elegant.erl changes the DY values for the misalignment elements, so I would expect to see different vertical centroids for the bunches, which is in fact what's seen. There's nothing that introduces a significant variation in energy between the bunches, since dipole modes have a we...

Wei-Hou, There seems to be a bug in Pelegant that the bunch output from &bunched_beam gets 0 for the IDSlotsPerBunch parameter. I'll look into it. Using a zero-length drift lattice to get output via &run_setup's output parameter is a good workaround. Also, there are scripts called generateBunch and ...

In order for phase advances to be available, you have to include a &twiss_output command with output_at_each_step=1.

--Michael

Chao, The IBS simulation method is summarized in https://accelconf.web.cern.ch/IPAC2015/papers/mopma012.pdf The calculation of the emittance growth rates is based on Piwinski's method. This is computed in segments of the lattice and then applied to the particle distribution either as random scatteri...

The Accelerator Physics and Operations group in Argonne's Accelerator Systems Divisions has an opening for a post-doctoral researcher with a background in both accelerator physics and artificial intelligence/machine learning.

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--Michael

Wei-Hou,

Another think I noticed in your lattice file is that you have bunched beam mode for the TRFMODE element but not for the WAKE or TRWAKE elements. I guess you want bunched beam mode for everything.

--Michael

Wei-Hou, This is an issue related to an unusual combination of settings: RFMODE elements are not compatible with CHANGE_T=1 on the RFCA elements. As the RFCA manual says N.B.: Do not use CHANGE_T=1 if you have rf cavities that are not at harmonics of one another or if you have other time-dependent e...

Wei-Hou,

That's a suspicious-looking error. The negative count value shouldn't happen. I'll do some more checking.

--Michael