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Why twiss doea not symmetry?
Posted: 19 Mar 2009, 05:33
by shancai
I use the attached lattice to compute twiss parameters.
I get a unsymmetry result, but the lattice has symmetry layout.
I don't know the reason.
Re: Why twiss doea not symmetry?
Posted: 19 Mar 2009, 08:01
by michael_borland
Can you post the files in a different format? I don't have any software that will extract files from a RAR file.
tar and zip formats are more universal.
--Michael
Re: Why twiss doea not symmetry?
Posted: 19 Mar 2009, 19:47
by shancai
Can this file be opened?
Thanks a lot!
Re: Why twiss doea not symmetry?
Posted: 19 Mar 2009, 21:35
by michael_borland
Shancai,
The lattice layout is symmetric, but the quadrupole strengths are not. To get a symmetric solution, Q1, Q2, and Q3, must have the same strength as Q8, Q7, and Q6, respectively.
If you make a new beamline like this:
twosec: line=(onesp,-onesp)
you'll find it has symmetric lattice functions.
--Michael