Hi all,
I am trying to get a linear chirp in X-P phase space. Which parameters should I optimize to get that?
Thanks,
Farzad
Linear chirp in X-P phase space
Moderators: cyao, michael_borland
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Re: Linear chirp in X-P phase space
Farzad,
I'm not sure if you are referring to an initial beam distribution or the distribution at the end of a beamline. Assuming that by 'P' you mean the total momentum of the particles, you want to maximize the dispersion function. If you give more detail about what you are trying to do, I might be able to give more helpful advice.
--Michael
I'm not sure if you are referring to an initial beam distribution or the distribution at the end of a beamline. Assuming that by 'P' you mean the total momentum of the particles, you want to maximize the dispersion function. If you give more detail about what you are trying to do, I might be able to give more helpful advice.
--Michael
Re: Linear chirp in X-P phase space
Hi Michael,
I want to give dispersion to the beam by a dipole and also optimize the twiss parameters at the end of the beam line. Due to initial energy spread and quadrupoles in the beam line the chirp in X-P phase space is not linear (curved shape like banana) and so I need to use sextupole to minimize non-linearity. I was wondering which parameter should I minimize/maximize to get linear chirp in X-P phase space?
I realized that by minimizing the Sxp the chirp (X-P) would be linear but not in all cases.
Thanks,
Farzad
I want to give dispersion to the beam by a dipole and also optimize the twiss parameters at the end of the beam line. Due to initial energy spread and quadrupoles in the beam line the chirp in X-P phase space is not linear (curved shape like banana) and so I need to use sextupole to minimize non-linearity. I was wondering which parameter should I minimize/maximize to get linear chirp in X-P phase space?
I realized that by minimizing the Sxp the chirp (X-P) would be linear but not in all cases.
Thanks,
Farzad
-
- Posts: 1933
- Joined: 19 May 2008, 09:33
- Location: Argonne National Laboratory
- Contact:
Re: Linear chirp in X-P phase space
Farzad,
Attached is an example of one way to do this. In summary, the method is
--Michael
Attached is an example of one way to do this. In summary, the method is
- Insert a SCRIPT element at the end of the beamline, with the script command designed to remove the linear correlations (x,p) and (xp, p)
- Minimize the horizontal emittance of the resulting beam by adjusting sextupoles.
--Michael
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- Posts: 1933
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- Location: Argonne National Laboratory
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Re: Linear chirp in X-P phase space
Farzad,
Actually, I realized that there is a better way to do this. The REMCOR element already provides the function that I implemented using a SCRIPT. See attached.
--Michael
Actually, I realized that there is a better way to do this. The REMCOR element already provides the function that I implemented using a SCRIPT. See attached.
--Michael
Re: Linear chirp in X-P phase space
Hi Michael,
Thanks a lot....brilliant way.
I used REMCOR at the end of the beam line and then tried to minimize horizontal emittance of the resulting beam by sextupole.
Thanks,
Farzad
Thanks a lot....brilliant way.
I used REMCOR at the end of the beam line and then tried to minimize horizontal emittance of the resulting beam by sextupole.
Thanks,
Farzad