Ping-pong modes and higher-periodicity multipactor

Multipactor is a vacuum discharge driven by secondary electron emission. Multiple period multipactors have long been known to exist but have been studied less extensively. In a period-n multipactor, electrons undergo multiple impacts in one rf period, with the synchronous phase alternating periodica...

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Bibliographic Details
Published in:Physics of plasmas 2013-05, Vol.20 (5)
Main Author: Kishek, R. A.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Bands
Boundaries
ELECTRIC DISCHARGES
ELECTRIC FIELDS
ELECTRON EMISSION
ELECTRONS
MAGNETIC FIELDS
MICROWAVE RADIATION
Particle in cell technique
PERIODICITY
PLASMA
PLASMA PRODUCTION
PLASMA SIMULATION
Plasmas
Strategy
Three dimensional
Unity
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Summary:Multipactor is a vacuum discharge driven by secondary electron emission. Multiple period multipactors have long been known to exist but have been studied less extensively. In a period-n multipactor, electrons undergo multiple impacts in one rf period, with the synchronous phase alternating periodically between multiple values. A novel resonant form is proposed that combines one- and two-surface impacts within a single period, provided the total transit time is an odd number of rf half-periods and the product of secondary yields exceeds unity. For low fD products, the simplest such mode is shown to significantly increase the upper electric field boundary of the multipacting region and lead to overlap of higher-order bands. The results agree nicely with 3-D particle-in-cell code simulations. An alternative, map-based method is introduced for analyzing higher-periodicity multipactor. Practical implications of the findings are discussed, including consequences for multipactor suppression strategies using a dc magnetic field.
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4802838