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Neutrino Factory/Muon Collider Document 537-v1

Effect of external magnetic fields on the operation of RF cavities

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Conference Publication
Submitted by:
Diktys Stratakis
Updated by:
Diktys Stratakis
Document Created:
20 May 2009, 15:05
Contents Revised:
20 May 2009, 15:05
Metadata Revised:
20 May 2009, 15:05
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When a local field enhancement along the RF cavity surface exists, it can induce emission of electrons - a process known as field emission. In the presence of external magnetic fields they are focused to a single spot to the other side of the cavity increasing so the possibility to generate surface damage. Such damage implies that serious problems may occur on lattices were RF cavities are placed within magnetic fields such as those of the proposed neutrino factory and muon collider. Here we estimate the delivered power density from impacted on the wall field emitted electrons as well as the associated rise of surface temperature and construct a simple model to analyze their dependence with emission current and external magnetic fields. We show that if the magnetic field is strong enough, sufficient temperature rise occurs that may induce surface deformation that eventually could limit the operation of the cavity. The influence of to which space-charge affects this process is investigated. Our results are compared to the existing experimental data from the 805 MHz cavity.
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