Lifetime correction using fast-off-energy response matrix measurements

Abstract

Following the measurements done at MAX-IV [1], we try to exploit for the ESRF-EBS Storage Ring (SR) off-energy response matrix measurement for the optimization of Touschek lifetime. The measurements performed with fast AC steerers on- and off-energy are analyzed and fitted producing an effective model including quadrupole and sextupole errors. Several alternatives to extrapolate sextupoles strengths for correction are compared in terms of lifetime. For the time being none of the corrections could produce better lifetime than the existing empirically optimized set of sextupoles.

Nonlinear optics from hybrid dispersive orbits

“…Significant improvements on its dynamic aperture and beam lifetime were observed after correcting sextupole errors. Desired results were obtained while testing the NOECO technique on the ESRF-EBS ring as well [3]. However, the dependence of nonlinear optics on off-energy orbits is only measurable for chromatic sextupoles.…”