Beams Document 4596-v1

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Parasitic Resonances in High Power Proton Linacs

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Fernanda G Garcia
Updated by:
Fernanda G Garcia
Document Created:
15 May 2014, 14:32
Contents Revised:
15 May 2014, 14:32
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15 May 2014, 14:32
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Parasitic resonances in superconducting rf cavities may make the beam unstable and increase the cryogenic load in high power proton machines. Therefore, Same Order Modes (SOMs) and Higher Order Modes (HOMs) must be investigated fully in order to determine if damping is required. An investigation into these modes at the European Spallation Source will be presented. The scale of the disruption of the proton pulse is discussed taking into account amplitude and phase errors from the Klystron, injection errors and the frequency spread the SOMs and HOMs. Mitigation techniques using HOM couplers are also investigated for cavities resonating at 704 MHz. Multipacting in these couplers is a concern as thermally induced detuning of the fundamental notch filter has limited the achievable gradient in other high power machines. It is therefore important to avoid potential multipacting conditions during the design phase. Presented here are simulations using the Track3P code developed at SLAC. Multipacting regions are highlighted and the suitability of proposed HOM coupler designs are discussed.
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