Abstract
This paper proposes a theoretical model for the single-surface multipactor on a dielectric. We consider the combined effects of the normal cumulative electric field, the normal and tangential radio frequency (RF) electric fields, as well as the tangential external direct current (DC) magnetic field and study the suppression effect of the tangential external DC magnetic field on the resonant multipactor. Kinetic properties of the electron and the resonant multipactor condition with no tangential external DC magnetic field are derived by analytical calculations. The flight time of the electron is analyzed profoundly by considering different values of the electron’s initial energy, the amplitude ratio between the normal cumulative electric field and the normal RF electric field, and the tangential external DC magnetic field. Our results demonstrate that the tangential external DC magnetic field can decrease the flight time, and hence, the resonant multipactor can be suppressed or mitigated effectively by the tangential external DC magnetic field. The flight time of the electron shows a decreasing trend as the electron’s initial energy increases, and the amplitude ratio between the normal cumulative electric field and the normal RF electric field decreases. The suppression effect of the tangential external DC magnetic field on the resonant multipactor can be much stronger when the amplitude ratio between the normal cumulative electric field and the normal RF electric field becomes larger. The resonant multipactor suppressing is also relevant to the amplitude ratio and the initial phase difference between the tangential and normal RF electric fields.
Highlights
INTRODUCTIONScitation.org/journal/adv resonant condition is that the transit time must be an integral multiple of the cycles of the radio frequency (RF) electric field
Multipactor1–8 is a ubiquitous phenomenon that usually happens in microwave systems operating in vacuum
When the multipactor occurs on a single-surface, the scitation.org/journal/adv resonant condition is that the transit time must be an integral multiple of the cycles of the radio frequency (RF) electric field
Summary
Scitation.org/journal/adv resonant condition is that the transit time must be an integral multiple of the cycles of the RF electric field. Due to the negative effects of the multipactor on the performance of space devices, several methods have been proposed in order to inhibit or mitigate this harmful phenomenon. These strategies attempt either reducing the SEY of the material surface or breaking the resonant condition to avoid the exponential increase of electrons. Valfell et al. first studied the effect of the external magnetic field on the dielectric multipactor Their results presented that only the external magnetic field perpendicular to both the RF electric field and the cumulative DC electric field could influence the susceptibility diagram. It has been noted that the proposed theoretical models in the literature with respect to the multipactor suppress by using the external DC magnetic field are still deficient.
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