Elegant users forum

Hello,
I am confused with the zPlane options of sddsmatchtwiss.
1/ I thought the "chirp" (which I assumed to be defined s56/s55) would set the chirp of the distribution. It looks like it is actually ADDING a chirp. Is my interpretation correct?
2/ Is there a way to set the longitudinal phase space slope to a given value? I saw there is a correlation option but I am not sure how it is defined [I would define the correlation as unit-less as s56/sqrt(s55*s66) but the help says the unit should be sec].
3/ a minor request -- I notice the on-line doc for sddsmatchtwiss does not include the zPlane options.

Thanks a lot! -- Philippe.

Philippe,

1) Yes, that's right, the chirp is added after the fact.

2) There are two parameters for this: alpha and the correlation. The correlation is defined as <s*delta>, whereas alpha is -<s*delta>/sqrt(<s*s>*<delta*delta> - <s*delta>^2)

3) Thanks for pointing this out.

--Michael