SBEND3D - Local and Global Frame: different particle trajectories
The tracking of the particles in the LOCAL frame reveals different behavior with respect to the GLOBAL frame
Field Map
- 120° Combined Function Magnet
- Reference energy: 230 MeV
Beam distribution
- From file: 10000 protons
- First 12 particles are:
#ID0: Reference particle
#ID1: Reference particle
#ID2 - #ID9: Particles with defined position and divergence offsets
#ID10: Off-momemtum particle (-11.5 % ) -> py = -0.08531
#ID11: Off-momemtum particle (+13.5 %) -> py = 0.1001511
#ID12: Dispersion function (1 %) -> py = 0.0074186 Tracking for particles #ID1 (reference), #ID10 and #ID11 (with momentum shift)
- Global Frame
- Local Frame
Conclusion
The particle trajectories in the LOCAL frame:
- show a "jump" at 3.8 m, where the field map ends.
- cross the reference trajectory, while in the GLOBAL frame the trajectory are separated