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Applied Physics Letters
Article . 2014 . Peer-reviewed
License: CC BY
Data sources: Crossref
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Applied Physics Letters
Article
License: CC BY
Data sources: UnpayWall
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Lancaster EPrints
Article . 2014 . Peer-reviewed
Data sources: Lancaster EPrints
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Low secondary electron yield engineered surface for electron cloud mitigation

Authors: Valizadeh, Reza; Malyshev, Oleg; Wang, Sihui; Zolotovskaya, Svetlana A.; Gillespie, W. Allan; Abdolvand, Amin;

Low secondary electron yield engineered surface for electron cloud mitigation

Abstract

Secondary electron yield (SEY or δ) limits the performance of a number of devices. Particularly, in high-energy charged particle accelerators, the beam-induced electron multipacting is one of the main sources of electron cloud (e-cloud) build up on the beam path; in radio frequency wave guides, the electron multipacting limits their lifetime and causes power loss; and in detectors, the secondary electrons define the signal background and reduce the sensitivity. The best solution would be a material with a low SEY coating and for many applications δ < 1 would be sufficient. We report on an alternative surface preparation to the ones that are currently advocated. Three commonly used materials in accelerator vacuum chambers (stainless steel, copper, and aluminium) were laser processed to create a highly regular surface topography. It is shown that this treatment reduces the SEY of the copper, aluminium, and stainless steel from δmax of 1.90, 2.55, and 2.25 to 1.12, 1.45, and 1.12, respectively. The δmax further reduced to 0.76–0.78 for all three treated metals after bombardment with 500 eV electrons to a dose between 3.5 × 10−3 and 2.0 × 10−2 C·mm−2.

Country
United Kingdom
Related Organizations
Keywords

Surfaces, interfaces and thin films, Materials and Engineering, Laser materials processing, 530, 620

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
112
Top 1%
Top 10%
Top 10%
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