Hi Michael,
another basic question from here:
how exactly is "t" coordinate of the sdds beam translated into spatial coordinates at the beginning of the lattice?
Is it taking the average of the beam and sets this to be strictly at the beginning of the first element of the beamline?
Can I import the beam with t not centered around zero, but some finite value?
What I'm doing is a multistage simulation with (straight sections with elegant, bunch compressors with CSRTrack) and so I'm cutting my beam line into pieces. Whenever I import back to elegant, I don't have to re-center particle distribution around t=0, right?
Many thanks!
Slava
Beam distribution import (sdds_beam)
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michael_borland
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Re: Beam distribution import (sdds_beam)
Slava,
When you re-import the beam into elegant, the average value of the t coordinate should have no impact on the results. Although elegant doesn't subtract off the average value, it uses it when it interprets the specified phases on the RFCA or RFCW elements.
The only restriction is that if <t> becomes so large that precision is lost at the scale of the bunch length. However, this is unlikely in a linac of any reasonable length.
--Michael
When you re-import the beam into elegant, the average value of the t coordinate should have no impact on the results. Although elegant doesn't subtract off the average value, it uses it when it interprets the specified phases on the RFCA or RFCW elements.
The only restriction is that if <t> becomes so large that precision is lost at the scale of the bunch length. However, this is unlikely in a linac of any reasonable length.
--Michael