R56 and momentum chirp definition in elegant

[Aamna_Khan]

Hello Michael,

I have confusion about the definition of R56. I can get the R56 from .mat file, which is an element of the transport matrix. Second, I can calculate it by particle tracking (.sig file): R56 = s56/s6*s6.

If I give some positive value of momentum chirp in the &bunced_beam, then I found different R56 from above methods. Technically, it seems correct because of <s*delta> corelation, but R56 is a beamline property so I would expect it to be same as obtained from .mat file. Could you please help me if I am mixing/missing something?

Aamna

[michael_borland]

Aamna,

The relationship between s56 and R56 is as follows

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s56(end) = s56(beginning) + s6^2*R56

so if you want to compute R56 from beam correlations, you need to use

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R56 = (s56(end)-s56(beginning))/s6^2

--Michael