Significantly Reduced Secondary-Electron-Yield of Aluminum Sheet with Fluorocarbon Coating

Secondary Electron Yield of a Thin Film Coating on the Aps Rf Cavity Tuners

A thin film coating of titanium nitride was applied to the surface of rf cavity tuners to reduce secondary electron generated when the existing copper base material is in place. The tuners are used in high-field gradients, where electron heating of the tuner is a problem. By reducing the generation of electrons the temperature of the tuners will be reduced, for better reliability. This paper co...

Secondary Electron Yield Measurements of TiN Coating and TiZrV Getter Film

In the beam pipe of the positron Main Damping Ring (MDR) of the Next Linear Collider (NLC), ionization of residual gases and secondary electron emission give rise to an electron cloud which can cause the loss of the circulating beam. One path to avoid the electron cloud is to ensure that the vacuum wall has low secondary emission yield and, therefore, we need to know the secondary emission yiel...

Transmission electron microscopy of cold sprayed 1100 aluminum coating

Cold-spraying of 1100 Al powder particles onto 1100 Al substrate was accomplished using carrier gases 100 vol.% He and a mixture of He–20 vol.% N2. TEM characterization correlates very well the occurrence of dislocations, presence of oxide, and surface instability phenomenon with observed mechanical and corrosion properties of the cold-sprayed coating. 2005 Acta Materialia Inc. Published by Els...

Modeling of reduced secondary electron emission yield from a foam or fuzz surface

Prediction of earing in deep drawing of anisotropic aluminum alloy sheet using BBC2003 yield criterion

This paper investigates the earing phenomenon in deep drawing of AA3105 aluminum alloy, experimentally and numerically. Earing defect is mainly attributed to the plastic anisotropy of sheet metal. In order to control such defect, predicting the evolution of ears in sheet metal forming analyses becomes indispensable. In this regard, the present study implements the advanced yield criterion BBC20...