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  • #25

Closed
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Opened Jan 29, 2017 by Valeria Rizzoglio@rizzoglio_v
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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

GlobalFrame

  • Local Frame

LocalFrame

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
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OPAL 1.5.2
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Reference: OPAL/src#25