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<p>Controlling nonlinear effects, generated by the strong sextupoles, on the dynamic aperture (DA) and beam lifetime is a challenging task in fourth-generation light sources. To address these nonlinearities, methods such as sextupole optimization or octupole magnets are often employed. Following the latter method three families of octupoles have been suggested for the Iranian Light Source Facility (ILSF) to compensate nonlinearities such as first-order amplitude-dependent tune shift (ADTS) and second-order resonance driving terms (RDTs). We have demonstrated that the performance of the ILSF could be improved by these families of octupole magnets. OPA software was used to determine the optimal positions, length, and strength of octupoles for the DA enlargement. The ELEGANT simulation code was used to evaluate the impact of octupoles on the DA and lifetime by analyzing the tune footprint and momentum aperture (MA).</p>

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Optimizing Dynamic Aperture of the Iranian Light Source Facility (ILSF) by Employing Families of Octupoles

  • 期刊论文

  • 发表日期：

    2026年2月7日

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  • Kowthar Noori,
  • Seyed Masoud Jazayeri,
  • Esmaeil Ahmadi

摘要

Controlling nonlinear effects, generated by the strong sextupoles, on the dynamic aperture (DA) and beam lifetime is a challenging task in fourth-generation light sources. To address these nonlinearities, methods such as sextupole optimization or octupole magnets are often employed. Following the latter method three families of octupoles have been suggested for the Iranian Light Source Facility (ILSF) to compensate nonlinearities such as first-order amplitude-dependent tune shift (ADTS) and second-order resonance driving terms (RDTs). We have demonstrated that the performance of the ILSF could be improved by these families of octupole magnets. OPA software was used to determine the optimal positions, length, and strength of octupoles for the DA enlargement. The ELEGANT simulation code was used to evaluate the impact of octupoles on the DA and lifetime by analyzing the tune footprint and momentum aperture (MA).