Curvilinear Coordinates

1_s_offset.gmad

This demonstrates starting the initial beam distribution from a finite curvilinear S position along the line. This example / test is placed in a drift (ie straight section). The particle should finish at \(0,0\) in curvilinear coordinates.

To run:

bdsim --file=1_s_offset.gmad

2_s_offset_in_strong_bend.gmad

Similar to 1_s_offset, but with the particle starting in the middle of a strong bend. Here, although the magnets are made from many short straight sections, the curvilinear trajectory is interpolated.