frequency_map

• type: action command.
• function: compute frequency map from tracking Note that the number of turns tracked is set by the run_control command.

&frequency_map
    STRING output = NULL;
    double xmin = -0.1;
    double xmax = 0.1;
    double ymin = 1e-6;
    double ymax = 0.1;
    long nx = 21;
    long ny = 21;
    long verbosity = 1;
    long include_changes = 0;
&end

• output -- The (incomplete) name of an SDDS file to send output to. Recommended value: ``%s.fma''.
• xmin, xmax -- Limits of grid of initial x coordinates for tracking.
• ymin, ymax -- Limits of grid of initial y coordinates for tracking. ymin should typically be a small, positive value so that there is some betatron oscillation from which to get the tune.
• nx -- Number of values of x coordinate in the grid.
• ny -- Number of values of y coordinate in the grid.
• verbosity -- If nonzero, prints possibly useful information while running.
• include_changes -- If nonozero, then computes not only the tunes, but also the changes in the tunes. It is recommended to leave this at the default value of 0, since the resolution of the tunes is higher then.