RF Breakdown of 805 MHz Cavities in Strong Magnetic Fields

Bowring, D.; Freemire, Ben; Haase, Andrew; Kochemirovskiy, Alexey; Lane, Peter; Леонова, М. А.; Moretti, A.; Palmer, M.; Peterson, D.; Stratakis, Diktys; Torun, Y.; Yonehara, K.

doi:10.18429/jacow-ipac2015-moad2

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DC vacuum breakdown in an external magnetic field

Lebedynskyi

Karpenko

Kholodov

et al. 2018

Nuclear Instruments and Methods in Physics Research Section A:

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The subject of the present theoretical and experimental investigations is the effect of the external magnetic field induction on dark current and a possibility of breakdown. The generalization of the Fowler-Nordheim equation makes it possible to take into account the influence of a magnetic field parallel to the cathode surface on the field emission current. The reduction in the breakdown voltage due to the increment in electron-impact ionization was theoretical predicted.Experimentally shown that the presence of a magnetic field about a tenth as a large as the cutoff magnetic field [18] reduces the breakdown voltage by 10% to 20% for practically all cathodes no matter what their surface treatment.

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