twiss_analysis

• type: setup command.
• function: analyze Twiss parameters within a user-defined region for purposes of optimization.

&twiss_analysis
        STRING start_name = NULL;
        STRING end_name = NULL;
        double s_start = -1;
        double s_end = -1;
        STRING tag = NULL;
        long clear = 0;
&end

• start_name -- Name of the element at which to start analysis. If the element occurs more than once, the first occurrence is used.
• end_name -- Name of the element at which to end analysis. If the element occurs more than once, the first occurrence is used.
• s_start -- Position (in meters) at which to start analysis.
• s_end -- Position (in meters) at which to end analysis.
• tag -- Name prefix for quantities computed by the analysis. The quantity names will have the form tag.statistic.quantity, where statistic is one of min, max, and ave, and quantity is one of betax, betay, etax, and etay. E.g., if tag is region1, then one could use expressions like region1.max.betax in optimization.
• clear -- If nonzero, all previously defined analysis regions are deleted.