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Study of Ultra-High-Vacuum Properties of Carbon-Coated Stainless Steel Beam Pipes for High-Energy Particle Accelerators

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Abstract

Ultra-high vacuum (UHV) in high-energy particle accelerator is essential to ensure the required beam lifetime. In the present communication, the UHV characterization of vacuum chambers coated with a thin film of carbon is reported. Recently, such coatings have attracted the interest for their low secondary electron yield and, consequently, their capability to eradicate electron cloud in high-intensity proton beam accelerators. Carbon was coated on stainless steel beam pipes by magnetron sputtering. Coated and uncoated stainless steel pipes (\(\hbox {C}_{\mathrm{ssp}}\) and \(\hbox {UC}_{\mathrm{ssp}}\)) were compared based on their outgassing rates and electron-stimulated desorption yields. The study conclusively verified that magnetron-sputtered carbon coatings are compatible with the requirements of most of the modern particle accelerators.

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Acknowledgements

The authors acknowledge Pedro Costa Pinto from VSC, CERN (Switzerland), for providing coated samples, and Ivo Wevers from CERN for providing all the technical facility for characterization. The authors would like to express their special thanks to Paolo Chiggiato for supervising the work under his technical guidance. Funding was provided by Pakistan Atomic Energy Commission and Higher Education Commision, Pakistan.

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Authors and Affiliations

  1. LINACP, PINSTECH, P.O. Nilore, Islamabad, 45650, Pakistan

    Afshan Ashraf & Sohail Ahmad Janjua

  2. Pakistan Institute of Engineering and Applied Sciences (PIEAS), P.O. Nilore, Islamabad, 45650, Pakistan

    Afshan Ashraf & Mazhar Mehmood

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  1. Afshan Ashraf
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  2. Mazhar Mehmood
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  3. Sohail Ahmad Janjua
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Correspondence to Afshan Ashraf.

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Ashraf, A., Mehmood, M. & Janjua, S.A. Study of Ultra-High-Vacuum Properties of Carbon-Coated Stainless Steel Beam Pipes for High-Energy Particle Accelerators. Arab J Sci Eng 44, 6593–6600 (2019). https://doi.org/10.1007/s13369-019-03761-6

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  • DOI: https://doi.org/10.1007/s13369-019-03761-6

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