Accession Number : AD1051603

Title :   Engineered Surfaces to Control Secondary Electron Yield for Multipactor Suppression

Descriptive Note : Technical Report,01 May 2015,01 Oct 2017

Corporate Author : Air Force Institute of Technology WPAFB United States

Personal Author(s) : Sattler, James

Full Text :

Report Date : 14 Sep 2017

Pagination or Media Count : 224

Abstract : A significant problem for satellites, vacuum electron devices, and particle accelerators is multipactor: an avalanche of electrons caused by recurring secondary electron emission (SEE) in a time-varying electric field. The consequences of multipactor range from temporary to permanent device failure. This research studied how surface topography can be engineered to minimize SEE and suppress multipactor. Two new semi-empirical models (one based on a 2D pore, the other based on a 3D pore) were developed to predict the secondary electron yield (SEY) of a porous surface based on pore aspect ratio and porosity. The models were validated with experimental SEY measurements of microporous gold surfaces. The more accurate 3D model predicts that a porous gold surface with pore aspect ratios = 2.0 and porosity = 0.5 will control the maximum SEY to near unity, providing a multipactor-resistant surface. Both the SEY models and experimental results confirm the understanding that the ability of a porous surface to control SEY is not dependent on pore size

Descriptors :   RADIO FREQUENCY AMPLIFIERS , radio frequency devices , photolithography , electron beam lithography , measurement , fabrication , dielectrics , electron energy , electron emission , microwaves , circuits , harmonics

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE