Influence of work function on the multipactor threshold

• Main Authors: Plaçais, Adrien, Sorolla, Eden, Belhaj, Mohamed, Hillairet, Julien, Puech, Jérôme
• Other Authors: DPHY, ONERA, Université de Toulouse Toulouse, ONERA-PRES Université de Toulouse, Institut de Recherche sur la Fusion par confinement Magnétique (IRFM), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre National d'Études Spatiales Toulouse (CNES), Systèmes RF (XLIM-SRF), XLIM (XLIM), Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)-Université de Limoges (UNILIM)-Centre National de la Recherche Scientifique (CNRS)
• Format: Conference Object
• Language: English
• Published: HAL CCSD 2018
• Subjects: DIELECTRICS; RADIO FREQUENCY; SLABS; ELECTROMAGNETIC WAVEGUIDES; SILVER; NUMERICAL MODELS; [SPI]Engineering Sciences [physics]; [PHYS]Physics [physics]; Iceland
• Online Access: https://hal.science/hal-02262204; https://hal.science/hal-02262204/document; https://hal.science/hal-02262204/file/DPHY19048.1564063556_preprint.pdf

International audience The multipactor effect is characterized by a very fast growth of the electronic population in vacuum Radio-Frequency (RF) devices. As it limits the transmitted RF power and can severely damage RF systems, multipactor has been subject to an extensive research for the past decades. Simulation tools are relatively accurate for the simplest cases, but less reliable for advanced problems: presence of an external magnetic field, complex geometry, time or temperature-dependent materials properties, etc. A code simulating the multipactor within an infinite parallel-plate waveguide with a dielectric coating on the bottom plate has been developed. The inclusion of a realistic energy distribution for the secondary electrons and a new emission model shows a strong dependence of the multipactor threshold on the metal work function and on the dielectric electric charge.