Design and Fabrication of UHV Compatible RF-Shielded Bellow Assembly for Indus-2

摘要

The bellow assembly with radio frequency (RF) shield has been designed & developed for the Indus-2 electron storage ring. The RF-shield is a usual finger type but has a special cantilever type spring-finger to press the contact finger to the beam tube. It is a flexible mechanical structure that maintains good electrical contact between adjoining Al-alloy vacuum chambers while absorbing the thermal expansion during beam operation or baking. It reduces the excitation of higher order modes (HOM) & ensures smooth flow of image (wall) current. This paper describes the design, manufacturing issues, material & tribological aspects of ultra high vacuum (UHV) compatible RF-shielded bellow assemblies.