Transversal Fiducialization

[dpe]

Dear Michael and all,

I'm traking a strange-distribution-traked bunch in a straight linac using sdds_beam. When I looked at the X and Y centroids along the linac I noticed that are not zeros (neither at the beginning) and that they vary with the s coordinate.

I'm now trying to understand how the fiducialization is made in this case and what is the reference of the centroids.

Thanks for the assistance.

[michael_borland]

By default, elegant references the initial transverse coordinates to the ideal coordinate system at the start of the accelerator. If you want to center your beam prior to tracking, use center_transversely=1 in &sdds_beam. This will move the beam transversely so that <x> = <y> = <x'> = <y'> = 0.

--Michael