Hi Michael,
I am trying to use sextupoles for reducing emittance growth in the beam line after the dipole. Since there is dispersion (in x), I expect that sextupoles just affect the emittance growth in x. But both emittances decrease using these sextupoles while there is dispersion just in x not in y plane. In y plane without dispersion these sextupoles should work like quadupole that makes emittance growth.
I have attached the lattice and tracking files.
Thank you in advance,
Farzad
Sextupoles chromatic correction
Moderators: cyao, michael_borland
Sextupoles chromatic correction
- Attachments
-
- ECN.png (7.43 KiB) Viewed 9317 times
-
- Tracking.zip
- (1.15 KiB) Downloaded 368 times
-
michael_borland
- Posts: 1959
- Joined: 19 May 2008, 09:33
- Location: Argonne National Laboratory
- Contact:
Re: Sextupoles chromatic correction
Farzad,
Theoretically, even for a thin-lens sextupole, there is a small change in the vertical divergence in going through a sextupole if there is horizontal dispersion and energy spread. So the emittance change you see is correct.
You can try it with a KSEXT element (which is a completely different implementation) and you'll get the same result.
--Michael
Theoretically, even for a thin-lens sextupole, there is a small change in the vertical divergence in going through a sextupole if there is horizontal dispersion and energy spread. So the emittance change you see is correct.
You can try it with a KSEXT element (which is a completely different implementation) and you'll get the same result.
--Michael