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Abstract:
In this paper is analysed the influence of Higher Order
Modes (HOM) on the operation of the superconducting
linac section of the SPL, the Superconducting Proton Linac
being designed at CERN. For this purpose, the characteristics of the TM Monopoles in the 2 different beta families (5-cell cavities at β = 0.65, 1.0 both at 704 MHz) of the SPL are calculated to estimate their effect on cryogenics and beam stability. For both criteria the maximum external Q of the HOMs is defined.