Low secondary electron yield engineered surface for electron cloud mitigation

Reza Valizadeh, Oleg Malyshev (Lead / Corresponding author), Sihui Wang, Svetlana A. Zolotovskaya, W. Allan Gillespie, Amin Abdolvand

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    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
    Original languageEnglish
    Article number231605
    Number of pages5
    JournalApplied Physics Letters
    Volume105
    Issue number23
    DOIs
    Publication statusPublished - 8 Dec 2014

    Keywords

    • Materials and Engineering
    • Laser materials processing
    • Surfaces, interfaces and thin films

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