### frequency_map around closed orbit

Posted:

**05 Dec 2021, 09:20**Dear All,

I would like to use frequency_map to compute the horizontal amplitude versus the energy offset.

Per default the particule not launched with respect to the chromatic orbit as explained in the doc.

&frequency_map

output = %s.fmadp,

xmin = 10e-6,

xmin = 10e-6,

xmax = 0.02,

delta_min = -0.06,

delta_max = 0.06,

nx = 101,

ny = 1,

ndelta = 201,

include_changes = 1 ! compute diffusion

&end

Is there an option to center the particle around the dispersive closed orbit ?

Best regards,

Laurent.

I would like to use frequency_map to compute the horizontal amplitude versus the energy offset.

Per default the particule not launched with respect to the chromatic orbit as explained in the doc.

&frequency_map

output = %s.fmadp,

xmin = 10e-6,

xmin = 10e-6,

xmax = 0.02,

delta_min = -0.06,

delta_max = 0.06,

nx = 101,

ny = 1,

ndelta = 201,

include_changes = 1 ! compute diffusion

&end

Is there an option to center the particle around the dispersive closed orbit ?

Best regards,

Laurent.