Electron conditioning of technical surfaces at cryogenic and room temperature in the 0–1 keV energy range

Haubner, Michal; Baglin, V.; Henrist, B.

doi:10.1016/j.vacuum.2022.111656

Cited by 2 publications

(6 citation statements)

References 47 publications

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“…The ESD conditioning curves measured here for the studied REBCO coatings also reveal no significant departure from the expected behavior when compared to the technicalgrade Cu, Al, and steel previously measured using the same methods [36,37]. The data equally well compare to data from other authors who conditioned metals held at ambient temperatures in terms of the electro-desorbed gas composition, initial ESD yields η 0 , inflection point location D 1 , and conditioning rates α.…”

Section: Dose Dependencesupporting

confidence: 80%

“…A newly developed analytical system was used to acquire the SEY and ESD data. The corresponding methodology for cryogenic measurements was described in detail in preceding articles [36,37].…”

Section: Experimental Techniques 231 Experimental Setupmentioning

confidence: 99%

“…Secondly, similar to technical-grade metals, the SEY of a REBCO-CC sample decreases under 300 eV of electron irradiation, a phenomenon known as electron conditioning. As most UHV-cleaned metal surfaces exhibit high SEY in their as-received air-exposed states [36,37], they typically condition during electron irradiation to reach SEY values at around 1, which are low enough to prevent electron multipacting.…”

Section: Secondary Electron Yieldmentioning

confidence: 99%

“…Similarly to the SEY, the ESD curves acquired here for the two REBCO-CCs, displayed in Figure 4, also resemble regular metal surfaces. This applies to comparing the electro-desorbed gas composition, desorption thresholds, and nominal ESD yields and their maximum to technical-grade UHV-cleaned metals, such as Cu previously studied on this cryogenic setup [36,37] and other technical metals studied by other authors at ambient temperatures [48][49][50][51][52][53]. The energy thresholds for desorption are in the typical 5-10 eV region characteristic of technical-grade metals, such as Cu measured on the same setup [36], or extrapolated by Billard et al [50].…”

Section: Energy Dependencementioning

confidence: 99%

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Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

et al. 2023

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Particle accelerators with superconducting magnets operating at cryogenic temperatures use a beam screen (BS) liner that extracts heat generated by the circulating bunched charge particle beam before it can reach the magnets. The BS surface, commonly made of high–conductivity copper, provides a low impedance for beam stability reasons, low secondary electron yield (SEY) to mitigate the electron–cloud (EC) effect, and low electron–stimulated desorption yield (ESD) to limit the dynamic pressure rise due to EC. Rare–earth barium copper oxide (REBCO) high–temperature superconductors (HTSs) recently reached technical maturity, are produced as coated conductor tapes (REBCO–CCs), and will be considered for application in future colliders to decrease the BS impedance and enable operation at around 50 K, consequently relaxing the cryogenic requirements. Aside from HTS properties, industry–grade REBCO–CCs also need qualification for EC and dynamic vacuum compatibility under accelerator–like conditions. Hence, we report the SEY and ESD measured at cryogenic temperatures of 12 K under low–energy electron irradiation of 0–1.4 keV. We also verify the sample compositions and morphologies using the XPS, SEM, and EDS methods. The energy and dose dependencies of ESD are comparable to those of technical–grade metals and one sample reached SEYMAX = 1.2 after electron conditioning.

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Section: Dose Dependencesupporting

confidence: 80%

Section: Experimental Techniques 231 Experimental Setupmentioning

confidence: 99%

Section: Secondary Electron Yieldmentioning

confidence: 99%

Section: Energy Dependencementioning

confidence: 99%

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Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

et al. 2023

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“…At the beginning of the irradiation, for both types of OFC, H2 has the highest PSD yield, followed by CO, CO2, CH4, and H2O. The results are different from the ESD test [10], because the differences in testing devices and cleaning processes. Initially, the gas desorption of the laser-etched OFC was slightly higher than that of the un-treated OFC.…”

Section: Psd Yieldmentioning

confidence: 79%

Study on the vacuum properties of laser-etched oxygen-free copper

Zhang,

Ma,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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The performance of operating particle accelerators has been seriously affected by the electron cloud (e-cloud) effect. The secondary electron emission (SEE) and the e-cloud can be effectively suppressed through laser-etching the inner surface of the vacuum chamber. Oxygen-free copper (OFC) has become the first choice for the vacuum chambers of modern accelerators due to its high electric and thermal conductivity and effective radiation shielding property. It is necessary to study the vacuum properties of the laser-etched OFC for the application in the particle accelerators. In this paper, the photon stimulated desorption (PSD) yield and the outgassing rate of the laser-etched OFC were measured. The results show that the laser-etched OFC presents lower PSD yield compared to the untreated OFC, while the outgassing rates of the laser-etched and unetched samples are similar.

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Electron conditioning of technical surfaces at cryogenic and room temperature in the 0–1 keV energy range

Cited by 2 publications

References 47 publications

Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

Electron Beam Characterization of REBCO-Coated Conductors at Cryogenic Conditions

Study on the vacuum properties of laser-etched oxygen-free copper

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