Malyshev, Oleg B. and Gurran, Lewis and Goudket, Philippe and Marinov, Kiril and Wilde, Stuart and Valizadeh, Reza and Burt, Graeme Campbell (2017) RF surface resistance study of non-evaporable Getter coatings. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 844. pp. 99-107. ISSN 0168-9002
Rs_paper_rev2_16_11_2016_final.pdf - Accepted Version
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Abstract
In many particle accelerators the beam parameters could be affected by the beam pipe wakefield impedance. It is vital to understand how the wakefield impedance might vary due to various coatings on the surface of the vacuum chamber, and this can be derived from surface resistance measurements. The bulk conductivity of two types of NEG films (dense and columnar) is determined. This is achieved by measuring the surface resistance of NEG-coated samples using an RF test cavity and fitting the experimental data to a standard theoretical model. The conductivity values obtained are then used to compare resistive wall wakefield effects in beam pipes coated with either of the two types of film.