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tune_footprint

&tune_footprint
    STRING delta_output = NULL,
    STRING xy_output = NULL,
    double xmin =  -0.02,
    double xmax =  0.02,
    double ymin =  1e-6,
    double ymax =  0.02,
    double x_for_delta = 1e-6,
    double y_for_delta = 1e-6,
    double delta_min = 0,
    double delta_max = 0,
    long nx = 20,
    long ny = 21,
    long ndelta = 21,
    long verbosity = 1,
    long quadratic_spacing = 0,
    long diffusion_rate_limit = -5,
    long immediate = 0
&end

This command makes available the following quantities for optimization. All quantities are limited by particle survival, crossing of integer and half-integer resonances, and the diffusion rate limit.

Typically, one strives to minimize FP.nuxSpreadChrom,FP.nuySpreadChrom, FP.nuxSpreadAmp, FP.nuySpreadAmp, FP.diffusionRateMaxChrom, and/or FP.diffusionRateMaxAmp while maximizing FP.deltaLimit, FP.xSpread, and/or FP.ySpread, and ensuring that FP.xyArea, at minimum, doesn't decrease. I.e., one wants the maximum stable region for momentum and position deviations with the minimum spread in tunes and minimum diffusion.


next up previous
Next: twiss_analysis Up: Namelist Command Dictionary Previous: transmute_elements
Robert Soliday 2014-03-21