A Mechanism for Emittance Growth Based on Non-Linear Islands in LHC

Landau octupoles are used in the LHC to prevent coherent instabilities of the circulating beam. The reduction of their strength occurring during the energy ramp can transport particles in nonlinear islands to larger amplitude. This has the potential to lead to emittance growth and to beam-losses. Be...

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Detalles Bibliográficos
Autores principales: Maclean, Ewen H, Giovannozzi, Massimo, Persson, Tobias H B, Tomás García, Rogelio
Lenguaje:eng
Publicado: JACoW 2021
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.18429/JACoW-IPAC2021-THPAB169
http://cds.cern.ch/record/2810347
Descripción
Sumario:Landau octupoles are used in the LHC to prevent coherent instabilities of the circulating beam. The reduction of their strength occurring during the energy ramp can transport particles in nonlinear islands to larger amplitude. This has the potential to lead to emittance growth and to beam-losses. Beam-based studies and simulations of emittance growth during Landau octupole ramps performed in the LHC are presented to explore this mechanism in more detail.

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