Chirp

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EsraaKh
Posts: 4
Joined: 27 Aug 2024, 08:59

Chirp

Post by EsraaKh » 12 Nov 2025, 06:54

Halo Michael,

I am working on a magnetic arc and want to compress the beam from an initial bunch length of 4 ps to 2 ps and initial sigma_s = 1e-3. I have particle_distribution.sdds, and I want to add chirp and then optimize R56. I am asking how to add chirp if I am using &sdds_beam, not &bunched_beam. I attached the lattice file and particle_dis.sdds. Another question, can I optimize both chrip and R56 to get a 2 ps bunch length?

Best regards
Esraa
Attachments
particle_dis.sdds
(14.53 MiB) Downloaded 3 times
marc0.lte
(2.22 KiB) Downloaded 3 times

michael_borland
Posts: 2025
Joined: 19 May 2008, 09:33
Location: Argonne National Laboratory
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Re: Chirp

Post by michael_borland » 12 Nov 2025, 17:52

Esraa,

You can add a chirp (R65 nonzero) and compression (R56 nonzero) using EMATRIX elements. Please see attached files for an example

When optimizing both the chirp and R56, you'll want to place reasonable limits on the maximum allowable energy spread and R56.

--Michael
Attachments
chirpOpt.ele
(661 Bytes) Downloaded 5 times
lattice.lte
(140 Bytes) Downloaded 4 times

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