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Phase space analysis of multipactor saturation in rectangular waveguide

Lingwood, Christopher and Burt, Graeme and Dexter, Amos and Goudket, Phillipe and Smith, Jonathan and Stoltz, Peter (2012) Phase space analysis of multipactor saturation in rectangular waveguide. Physics of Plasmas, 19 (3). ISSN 1070-664X

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Abstract

In certain high power RF systems multipactor cannot be avoided for all operating points, but its existence places limits on performance, efficiency, lifetime, and reliability. As an example multipactor in the input couplers of superconducting RF cavities can be a major limitation to the maximum RF power. Several studies have concentrated on rectangular waveguide input couplers which are used in many light sources. Most of these studies neglect space charge assuming that the effect of space charge is simply to defocus the electron bunches. Modelling multipactor to saturation is of interest in determining the performance of waveguide under a range of conditions. Particle-in-cell modelling including space charge has been performed for 500 MHz half-height rectangular waveguide. Phase plots of electron trajectories can aid understanding the processes taking place in the multipactor. Results strongly suggest that the multipacting trajectories are strongly perturbed by space charge causing the electrons to transition from two-surface to single-surface trajectories as the multipactor approaches saturation.

Item Type: Article
Journal or Publication Title: Physics of Plasmas
Uncontrolled Keywords: microwave switches ; particle beam bunching ; phase space methods ; Plasma filled waveguides ; plasma simulation ; plasma switches ; plasma transport processes ; rectangular waveguides ; space charge
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Departments: Faculty of Science and Technology > Engineering
Faculty of Science and Technology > Physics
ID Code: 51892
Deposited By: ep_importer_pure
Deposited On: 07 Dec 2011 15:17
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 22:55
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/51892

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