NEG coating deposition and characterisation of narrow-gap insertion devices and small-diameter chambers for light sources and particle accelerators

Porcelli, Tommaso; Puro, Marco; Raimondi, S.; Siviero, F.; Maccallini, Enrico; Manini, Paolo; Bongiorno, G.

doi:10.1016/j.vacuum.2016.12.036

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…To solve the problem of ultra-high vacuum, non-evaporable getter coatings were developed due to their advantages such as evenly distributed pumping speed, low activation temperature, low particle-induced desorption and low thermal outgassing rates [1][2][3][4][5][6]. These properties provide the only solution for a conductance-limited environment in many cases [7]. To improve the distributed pumping speed and reduce thermal outgassing and particle-induced outgassing rates, Ti-V-Hf-Zr getter film coatings were proposed by Malyshev et al The related experimental results showed that electron stimulated desorption yields for all desorbed species of this film are lower than those of Ti-V-Zr film [1].…”

Section: Introductionmentioning

confidence: 99%

Non-Evaporable Getter Ti-V-Hf-Zr Film Coating on Laser-Treated Aluminum Alloy Substrate for Electron Cloud Mitigation

Wang¹,

Gao²,

You³

et al. 2019

Coatings

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For improving the vacuum and mitigating the electron clouds in ultra-high vacuum chamber systems of high-energy accelerators, the deposition of Ti-V-Hf-Zr getter film on a laser-treated aluminum alloy substrate was proposed and exploited for the first time in this study. The laser-treated aluminum surface exhibits a low secondary electron yield (SEY), which is even lower than 1 for some selected laser parameters. Non-evaporable getter (NEG) Ti-V-Hf-Zr film coatings were prepared using the direct current (DC) sputtering method. The surface morphology, surface roughness and composition of Ti-V-Hf-Zr getter films were characterized and analyzed. The maximum SEY of unactivated Ti-V-Hf-Zr getter film on laser-treated aluminum alloy substrates ranged from 1.10 to 1.48. The X-ray photoelectron spectroscopy (XPS) spectra demonstrate that the Ti-V-Hf-Zr coated laser-treated aluminum alloy could be partially activated after being heated at 100 and 150 °C, respectively, for 1 h in a vacuum and also used as a pump. The results were demonstrated initially and the potential application should be considered in future particle accelerators.

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Section: Introductionmentioning

confidence: 99%

Non-Evaporable Getter Ti-V-Hf-Zr Film Coating on Laser-Treated Aluminum Alloy Substrate for Electron Cloud Mitigation

Wang¹,

Gao²,

You³

et al. 2019

Coatings

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“…There is a project underway at the National Institute for Standards and Technology (NIST) as well to take advantage of the dependence of the atom trap lifetime on pressure to develop a cold atom vacuum standard (CAVS) gauge to directly measure pressure in the UHV to XHV regime 13 . Whereas the commercial development of NEG coatings has largely focused on rapid deposition for accelerator scale systems and coating small-diameter insertion devices to meet the needs of light sources requiring vacuum in the UHV regime 14 , this paper describes the NEG coating techniques employed at Jefferson Lab for large diameter chambers and the improvement in base pressures that can be achieved in coated chambers.…”

Section: Introductionmentioning

confidence: 99%

Nonevaporable getter coating chambers for extreme high vacuum

Stutzman

Adderley

Mamun

et al. 2018

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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Techniques for non-evaporable Getter (NEG) NEG coating a large diameter chamber are presented along with vacuum measurements in the chamber using several pumping configurations, with base pressure as low as 1.56×10 -12 Torr (N 2 equivalent) with only a NEG coating and a small ion pump. The authors then describe modifications to the NEG coating process to coat complex geometry chambers for ultra-cold atom trap experiments.Surface analysis of NEG coated samples is used to measure composition and morphology of the thin films. Finally, pressure measurements are compared for two NEG coated polarized electron source chambers: the 130 kV polarized electron source at Jefferson Lab and the upgraded 350 kV polarized electron source, both of which are approaching or within the extreme high vacuum range, defined as P < 7.5×10 -13 Torr.

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Adsorption Behaviors of Hydrogen on Equal Atomic Ratio TiZrV Film Applied in AB-BNCT by Density Functional Theory Study

Wang

et al. 2023

Springer Proceedings in Physics

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NEG coating deposition and characterisation of narrow-gap insertion devices and small-diameter chambers for light sources and particle accelerators

Cited by 7 publications

References 17 publications

Non-Evaporable Getter Ti-V-Hf-Zr Film Coating on Laser-Treated Aluminum Alloy Substrate for Electron Cloud Mitigation

Non-Evaporable Getter Ti-V-Hf-Zr Film Coating on Laser-Treated Aluminum Alloy Substrate for Electron Cloud Mitigation

Nonevaporable getter coating chambers for extreme high vacuum

Adsorption Behaviors of Hydrogen on Equal Atomic Ratio TiZrV Film Applied in AB-BNCT by Density Functional Theory Study

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