Analysis of a Non-Evaporable Getter of Ti-Al-Zr Thin Film with Enhanced Performance Used for Ultra-High Vacuum Generation

Alamgir, M.; Ikram, Muhammad; Mughal, Ghalib Hussain; Asghar, Ghulam; Réhman, Shafiq Ur; Qaseem, S.; Kamran, Muhammad; Ullah, Amir; Khan, Sartaj

doi:10.3938/jkps.75.373

Cited by 4 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…铜样品的光子反射率及光电子产额 [41] Table 3. Photon reflectivity and photoelectron yield of LHC type samples, sawtooth copper samples and laser treated copper samples [41] .…”

Section: 气体种类mentioning

confidence: 99%

Gas density evolution in beam screen of super proton-proton collider

You¹,

Wang²,

Gao³

et al. 2021

Acta Phys. Sin.

View full text Add to dashboard Cite

Vacuum stability is one of the key issues in the design of particle accelerators, especially high-energy super proton-proton colliders. The synchrotron radiation generated by proton beams in the bending area will desorb and crack the gas molecules which have adsorbed on the wall of the cold bore. The collision or scattering between the proton beam and the desorbed gas molecules may result in the degradation of the beam quality and the reduction of beam life time, and even the collapse of the beam. Usually a copper coated stainless steel beam screen is installed in the cold bore to intercept synchrotron radiation and reduce gas desorption. Based on the design parameters of the Super Proton-Proton Collider, in this paper the source of gas in the beam screen is analyzed. By considering the photon-induced desorption process and the gas molecule cracking process, the gas dynamic model in the beam screen is established. Moreover, the calculation of the evolution of the gas density in the beam screen with the beam operating time is carried out, and the effect of TiZrV non-evaporable getter film coated beam screen on the dynamic gas density is explored. The results show that H2 is the main desorption gas in the beam, the next is CO, while the molecular density of CO2 and CH4 are limited by molecular cracking. The maximum gas density in the beam screen appears at the initial stage of operation, and the gas density decreases with time going by. In order to strengthen adsorption and reduce desorption, TiZrV coated beam screen is discussed in this paper. In the case of TiZrV coated stainless steel beam screen, the maximum equivalent H2 density is about two order of magnitude lower than in the case of copper coated stainless steel beam screen. The non-evaporable getter(NEG) for beam screen material can significantly improve vacuum performance. The calculation results can qualitatively reflect the dynamic vacuum evolution in the beam screen during the beam operation and provide a reference for designing vacuum systems.

show abstract

Section: 气体种类mentioning

confidence: 99%

Gas density evolution in beam screen of super proton-proton collider

You¹,

Wang²,

Gao³

et al. 2021

Acta Phys. Sin.

View full text Add to dashboard Cite

show abstract

“…Although this main peak has traditionally been used as a charge reference for XPS spectra, the physical significance of this peak is sometimes confused due to insufficient study of this particular substance. The left long tail is usually analyzed from several perspectives, such as carboxyl, ,, CO, C–O, ,, carbonate, ,, carbon atoms attached to oxygen, and alcohols . In summary, the deconvoluted XPS peaks varied according to the researchers’ understanding.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Passivation Layer under Air Exposure on TiZrV Non-Evaporable Getter Film

Shi,

Wang,

Shi

et al. 2024

J. Phys. Chem. C

View full text Add to dashboard Cite

Non-evaporable getter (NEG) films require thermal vacuum activation prior to their use in high vacuum environments. The degree of activation difficulty is influenced by the properties of the passivation layer, but there is limited information about its composition. The purpose of this study is to investigate the formation mechanism and clarify this issue. The film microstructure was investigated by scanning electron microscopy (SEM) and grazing incidence X-ray diffraction (GIXRD). The quantum chemical approach and a single-metal-atom catalytic model were used to calculate the energy barrier for the reactions between the metal atom and the gas molecule, as well as between different hydrocarbon groups. These results facilitated the deconvolution of the X-ray photoelectron spectroscopy (XPS) data and the variation analysis of the energy dispersive spectroscopy (EDS) results. It can be concluded that the presence or absence of hydrogen-proton catalysis can significantly affect the dissociation pathways of carbon dioxide, leading to the formation of different reaction products. In addition, the long-term aluminum foil wrapping and storage can significantly affect the composition of the film passivation layer. This study provides valuable insights not only into the passivation layer formation mechanism, but also into the film gettering mechanism.

show abstract

Unveiling the secrets of non-evaporable getter films: Activation temperature, activation time, and achievable activation degree

Shi,

Wang,

et al. 2024

Journal of Alloys and Compounds

View full text Add to dashboard Cite

Analysis of a Non-Evaporable Getter of Ti-Al-Zr Thin Film with Enhanced Performance Used for Ultra-High Vacuum Generation

Cited by 4 publications

References 17 publications

Gas density evolution in beam screen of super proton-proton collider

Gas density evolution in beam screen of super proton-proton collider

Formation Mechanism of Passivation Layer under Air Exposure on TiZrV Non-Evaporable Getter Film

Unveiling the secrets of non-evaporable getter films: Activation temperature, activation time, and achievable activation degree

Contact Info

Product

Resources

About