Space charge when splitting lattice into files
Posted: 30 Sep 2020, 12:45
Hi,
I have a beamline with a compressing dogleg, and some LSC-induced energy spread growth in the line *after* the dogleg, when I am at maximum compression. This is expected.
However, if I split my lattice into (say), DOGLEG.lte, POST-DOGLEG.lte etc. and track using the output of the previous lattice section as the input to the SDDS_BEAM command, I no longer see LSC-induced energy-spread in the post-dogleg section. All other parameters stay the same except the longitudinal ones, that would be expected to grow due to LSC. CSR and other effects are off (but do not change the basic result).
"Split" and "Single" Lattices are identical (combining all "Split" lattices, does give the "Single" lattice).
Is there something wrong with what I am doing? Or is there a method I can call to "fix" this?
I have included a plot, illustrating the issue (hopefully it is clear what is going on!). The location of the splitting between lattice files is highlighted.
Thanks for any help you can provide,
James
I have a beamline with a compressing dogleg, and some LSC-induced energy spread growth in the line *after* the dogleg, when I am at maximum compression. This is expected.
However, if I split my lattice into (say), DOGLEG.lte, POST-DOGLEG.lte etc. and track using the output of the previous lattice section as the input to the SDDS_BEAM command, I no longer see LSC-induced energy-spread in the post-dogleg section. All other parameters stay the same except the longitudinal ones, that would be expected to grow due to LSC. CSR and other effects are off (but do not change the basic result).
"Split" and "Single" Lattices are identical (combining all "Split" lattices, does give the "Single" lattice).
Is there something wrong with what I am doing? Or is there a method I can call to "fix" this?
I have included a plot, illustrating the issue (hopefully it is clear what is going on!). The location of the splitting between lattice files is highlighted.
Thanks for any help you can provide,
James