track

• type: action command.
• function: track particles.

&track
    long center_on_orbit = 0;
    long center_momentum_also = 1;
    long offset_by_orbit = 0;
    long offset_momentum_also = 1;
    long soft_failure = 1;
    long use_linear_chromatic_matrix = 0;
    long longitudinal_ring_only = 0;
&end

• center_on_orbit -- A flag indicating whether to center the beam transverse coordinates on the closed orbit before tracking.
• center_momentum_also -- A flag indicating whether to center the momentum coordinate also.
• offset_by_orbit -- A flag indicating whether to offset the transverse beam coordinates by the closed orbit before tracking. Similar to center_on_orbit, but the initial centroids of the beam are preserved. The beam is simply displaced by the closed orbit rather than being centered on it.
• offset_momentum_also -- A flag indicating whether to also offset the beam momentum to the momentum of the closed orbit. If the start_from_centroid or start_from_dp_centroid parameters are used on the closed_orbit command, this flag should be set to 0; otherwise, one will offset the beam central momentum by its own value.
• soft_failure -- If there is an error during tracking (e.g., a failure of orbit correction), continue to produce file output. This creates essentially empty slots in the files corresponding to the failed steps.
• use_linear_chromatic_matrix -- For each particle, a first-order matrix is computed for the particular momentum offset of the particle using the linear chromaticity and linear dependence of the beta functions on momentum.
• longitudinal_ring_only -- Tracks longitudinal coordinates only for a ring.