Interaction of Multipactor Discharge and rf Circuit

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Abstract
A simple model is constructed to analyze the temporal evolution of a multipactor discharge in an rf cavity. The multipactor current may, transiently, reach a level comparable to the wall current that is needed to sustain the rf field. It saturates at a much lower level in the steady state, primarily by its loading of the cavity; the image space charge force associated with the multipactor electrons plays a relatively minor role. At saturation, the electron impact energy is equal the lowest value that gives unity in the secondary electron yield curve.

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