Author: Farricker, A.
Paper Title Page
MOPOR038 Implications of Resonantly Driven Higher Order Modes on the ESS Beam 683
  • A. Farricker, R.M. Jones, N.Y. Joshi
    UMAN, Manchester, United Kingdom
  • S. Molloy
    ESS, Lund, Sweden
  The European Spallation Source (ESS) in Lund, Sweden, will be a facility for fundamental physics studies of atomic structure using a spallation source of unparalleled brightness. To achieve this end, a 2.86 ms long pulsed proton beam will be accelerated up to a final energy of 2 GeV using three suites of superconducting cavities. If a Higher Order Mode (HOM) lies on a harmonic of the bunch frequency the HOM will be resonantly driven. This will dilute the beam quality significantly. Errors in fabricating these cavities are inevitable, and this sets a tolerance on how close the HOM can be within a harmonic of the bunch frequency. The baseline design for ESS requires HOMs to be at least 5 MHz from a machine line. Here we provide details of several finite element electromagnetic simulations on the HOMS anticipated in these ESS cavities. We analyse their impact on the beam emittance using a drift-kick-drift model with the potential for relaxed tolerances.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPOR038  
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