CSR simulations with CSRCSBEND

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weijie
Posts: 2
Joined: 20 May 2020, 11:46

CSR simulations with CSRCSBEND

Post by weijie » 24 May 2020, 21:52

Dear Micheal or someone interested:
Since there don't have a CSR option in the FEL radiator,I am using CSRSCBEND to simulate the CSR effect in a FEL radiator.But when I am tracking,there is warning saying that particle acquired undefined slopes when integrating through kick multipole.I don't know how to fix it up.Loooking forward to your answers.Thanks a lot.

michael_borland
Posts: 1796
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
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Re: CSR simulations with CSRCSBEND

Post by michael_borland » 27 May 2020, 19:23

That error indicates that a particle has very large amplitude or very large energy loss. You might be able to resolve the issue by adding a physical aperture (e.g., using MAXAMP), but it would be a good idea to understand why the large amplitude or energy loss is occurring. Possibilities include noisy CSR calculations from too few particles or too many bins.

--Michael

weijie
Posts: 2
Joined: 20 May 2020, 11:46

Re: CSR simulations with CSRCSBEND

Post by weijie » 06 Jun 2020, 01:40

Thanks for the help of the last error. But there was another problem. I wrote a 'beam.sdds' and send it to the sdds_beam, but the output seems totally wrong. The emittance grew rapidly which was not realistic. The beam file and latttice file is in the attachment. I wish you can give me some advise.
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radiator.zip
(19.22 MiB) Downloaded 239 times

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