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In certain high-power RF devices, such as isolators and circulators, a static magnetic field is present in parallel with the oscillating RF electric field. This parallel magnetic field imposes electron Larmor motion, which restricts the trajectories of electrons accelerated by the RF field. In open geometries, magnetic confinement reduces electron losses in the multipactor region and can reduce the...
Multipactor and ionization breakdown can cause critical damage to RF systems within spacecraft systems. In order to prevent these breakdown events and ensure proper satellite operation, fundamental physics and the RF system must both be well defined and understood. A standardized approach and methodology for breakdown prevention has been developed that encompasses the needed fundamental physics and...
In this work, multiple methods of detecting radio frequency (RF) breakdown are described. This includes methods for detecting multipactor breakdown in vacuum and ionization breakdown at intermediate pressures between atmosphere and 10−4 Torr. It describes sensitivity of multiple common detection methods in various passive microwave component types. New innovations in breakdown detection are described...
Multipactor breakdown is a resonant electron phenomena that is observed in spacecraft RF systems. While multipactor breakdown thresholds are well documented for parallel metal surfaces, susceptible breakdown geometries in passive RF components frequently deviate from this ideal parallel-plate geometry. A common feature of concern is an angled or chamfered edges placed on dielectrics inside RF components...
The physics of plasma transport from the bulk plasma through the magnetic cusp to the anode remains poorly understood. A proper accounting of plasma losses to the anode is critical to accurate modeling of multicusp device performance. The objective of this work is to analyze plasma transport to the anode in multicusp discharge chambers and evaluate its impact on discharge performance. In this work,...
In this work, the current distribution at the four magnet rings of a cylindrical 16-cm diameter mild steel ion source discharge chamber was studied. The current distribution measurements were made using thin, electrically isolated collector electrodes affixed to each magnet ring. Current collected at the magnetic cusps as well as the intervening anode material was quantified as a function of discharge...
Summary form only given. The physics of plasma losses at magnetic cusp surfaces in multipole ion sources remains a poorly understood problem. Loss area in these sources determines discharge ionization performance, efficiency, and stability. In previous work, electron current density profiles were obtained in the region above a magnetic cusp in a 20 cm partial conic ring cusp ion thruster discharge...
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