Study on the Effect of Laser Parameters on the SEY of Aluminum Alloy

Wang, Jie; Gao, Yong; Fan, Jiakun; You, Zhiming; Wang, Sheng; Xu, Zhanglian

doi:10.1109/tns.2019.2898922

Cited by 11 publications

(13 citation statements)

References 27 publications

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“…The SEY properties were characterized under normal incidence using a dedicated SEY measurement device which was introduced in Reference [17]. The electron dose for SEY tests was about 7 × 10 −6 C cm −2 , with an electron beam spot size of ~1 mm.…”

Section: Sem and Xps Resultsmentioning

confidence: 99%

“…The surface chemical properties of the samples were determined via an AXIS Ultrabld X-ray photoelectron spectroscopy (XPS) with monochromatized Al Ka Xray source. The SEY properties were characterized under normal incidence using a dedicated SEY measurement device which was introduced in Reference [17]. The electron dose for SEY tests was about 7 × 10 −6 C cm −2 , with an electron beam spot size of~1 mm.…”

Section: Characterization Methodsmentioning

confidence: 99%

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Laser Processed Oxygen-Free High-Conductivity Copper with Ti and Ti–Zr–V–Hf Films Applied in Neutron Tube

et al. 2019

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The laser processing method has proven to produce surfaces while ensuring a low secondary electron yield of oxygen-free high-conductivity copper (OFHC) samples, making it attractive for electron cloud mitigation in next-generation particle accelerators and neutron tubes. In this work, the laser processing method is proposed to OFHC targets for the first time, aiming to reduce the secondary electrons in the neutron tube. The secondary electron yields (SEYs) and the thermal conductivities of Ti film and quaternary Ti–Zr–V–Hf films with unprocessed and laser processed OFHC substrates are investigated. Our results highlight that the thermal conductivity of Ti film with laser processed OFHC substrates is in proximity to the cleaned bare OFHC sample, especially at high temperatures. Moreover, the SEY of coated OFHC substrates are higher than that of coated laser processed substrates, which indicates the better secondary electron suppression capability of coated laser processed substrates. Therefore, the thermal conductivity and SEY results illustrate that the application of Ti and Ti–Zr–V–Hf coated laser processed OFHC can be considered to improve the neutron yield in neutron tubes in the future.

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Section: Sem and Xps Resultsmentioning

confidence: 99%

Section: Characterization Methodsmentioning

confidence: 99%

Laser Processed Oxygen-Free High-Conductivity Copper with Ti and Ti–Zr–V–Hf Films Applied in Neutron Tube

et al. 2019

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“…The aluminum alloy substrates were water-jet cut from an ingot and subsequently polished, with the dimensions of 10 mm × 10 mm × 0.5 mm for scanning electron microscope (SEM), laser-scanning confocal microscopy (LSCM, LEXT Olympus OLS4000-SU, Olympus, Tokyo, Japan) and X-ray photoelectron spectroscopy (XPS) tests and 9 mm × 20 mm × 0.5 mm for SEY (introduced in Ref. [17]) measurements. Before initiating film deposition, aluminum alloy, laser-treated aluminum alloy and Si<100> substrates were cleaned with acetone and rinsed with absolute ethyl alcohol for 15 min, respectively, using an ultrasonic cleaning machine.…”

Section: Methodsmentioning

confidence: 99%

“…A Helios Nanolab 600 dual-beam focused ion beam (FIB)-SEM system (FEI, Hillsboro, OR, USA) was employed for localized micro-machining and high-resolution imaging acquisition, which is capable of imaging with a resolution better than 1 nm at 15 kV beam energies. The SEY measurements were determined with the equipment as introduced in reference [17]. The pressure during SEY measurements is usually below 10 −7 Pa.…”

Section: Characterization Methodsmentioning

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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“…Laser processed aluminum alloy was proposed by Wang et al [20] as a prospective option for electron cloud (EC) mitigation, which could be used in the vacuum system of accelerators. The related properties of laser treated metals for EC inhibition were investigated for the past few years, such as the surface resistance of laser treated copper samples [21], the adsorption and desorption properties of laser processed copper [22], and the empirical model of laser treated porous stainless steel surface with gold film coatings [23].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Ultrasonic Cleaning on the Secondary Electron Yield, Surface Topography, and Surface Chemistry of Laser Treated Aluminum Alloy

Wang¹,

Gao²,

You³

et al. 2020

Materials

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Laser ablation technique is a novel method for obtaining a surface with a low secondary electron yield (SEY) that can mitigate electron cloud in high-energy accelerators. Before the installation of laser processed aluminum alloy, surface cleaning is of the essence to reduce the contaminations of ultra-high vacuum systems for providing appropriate pressure for beam operation consequently. Laser processed aluminum alloy is one of the crucial candidates for the vacuum system construction of future accelerators. Moreover, ultrasonic cleaning is an essential procedure for most materials applied in vacuum systems. Therefore, in order to verify the stability of the laser created structures by ultrasonic cleaning and evaluate the impact of the cleaning on the SEYs, the surface topographies, and the surface chemistries of laser treated aluminum alloy, SEY measurements and related tests were performed. After ultrasonic cleaning, the SEYs of laser treated aluminum alloy increased from 0.99, 1.05, and 1.16 to 1.43, 1.74, and 1.38, respectively. Compared to the surface roughness of uncleaned laser treated aluminum samples, the cleaned laser treated ones decreased from 10.7, 7.5, and 14.5 to 9.4, 6.9, and 12.9, respectively. The results indicate that ultrasonic cleaning can induce the SEY increase of laser processed aluminum alloy. The correlative mechanism between the surface morphology, the surface chemistry, and SEY increase were analyzed for the first time.

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Study on the Effect of Laser Parameters on the SEY of Aluminum Alloy

Cited by 11 publications

References 27 publications

Laser Processed Oxygen-Free High-Conductivity Copper with Ti and Ti–Zr–V–Hf Films Applied in Neutron Tube

Laser Processed Oxygen-Free High-Conductivity Copper with Ti and Ti–Zr–V–Hf Films Applied in Neutron Tube

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

The Effect of Ultrasonic Cleaning on the Secondary Electron Yield, Surface Topography, and Surface Chemistry of Laser Treated Aluminum Alloy

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