Extended Data Fig. 2: Simulation model of the SPS.
From: Observation of fixed lines induced by a nonlinear resonance in the CERN Super Proton Synchrotron
In these pictures (a-f) we show all 6 two-dimensional phase space projections as obtained from tracking simulations using the MAD-X code31 with the same sextupole settings as used in the experiment (cf. Extended Data Fig. 1). The red line is the best fit of Eq. (1) to the simulation data. The obtained results are very similar to the experimental data shown in Extended Data Fig. 1, except that in the simulation the starting coordinates were initialized closer to the fixed line and thus reducing the jitter around the fixed line structure. Note that the simulation is not affected by BPM noise.
