Apr 9 – 13, 2018
Beurs van Berlage
Europe/Zurich timezone

Recent development in Laser ablation surface engineering for reduction of secondary electron yield

Apr 10, 2018, 5:00 PM
1h 30m
Beurs van Berlage

Beurs van Berlage

Damrak 243, 1012 ZJ Amsterdam, Netherlands
Board: 2AMSP27
EuroCirCol Poster session

Speaker

Reza Valizadeh (STFC Daresbury Laboratory)

Description

Developing a surface with low Secondary Electron Yield (SEY) is one of the principal methods of mitigating the beam-induced electron multipacting and electron cloud in high-energy charged particle accelerators. Since the wall material, surface chemistry, topography and electron energy are the parameters that influence the SEY, common mitigation mechanisms are based on engineering the above parameters. Recently ASTeC has demonstrated that nano- and microstructures engineered on Cu, Al and Stainless steel surface reduces SEY to less than 1. Such structures can be readily produced by nano- and sub-nanosecond pulsed laser [1]. SEY can be further reduced to an even lower value by bake-out and/or photon and/or electron bombardment [2]. A systematic analysis of surface composition and chemistry (using XPS), the surface topography (using SEM), and SEY measurements with primary electron energies ranging from 10 to 2000 eV, surface impedance and generated particles size is reported and correlated to the laser treatment conditions.

Primary author

Reza Valizadeh (STFC Daresbury Laboratory)

Co-authors

Oleg Malyshev (STFC Daresbury Laboratory) Taaj Sian (STFC) Puneet Tiagy (STFC) Walter Perrie (University of Liverpool) David Whitehead (University of Manchester)

Presentation materials

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