Measurement of lifetimes of thin carbon stripper foils produced by ion-beam sputtering |
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| Affiliation: | 1. High Energy Accelerator Research Organization (KEK), Oho 1-1, Tsukuba, Ibaraki 305-0801, Japan;2. Tokyo Institute of Technology, Ookayama 2-12, Meguro-ku, Tokyo 152-8550, Japan;1. Department of Finance and Economics, Qatar University, Qatar;2. Department of Economics, University of Miami, USA;3. Department of Economics, Virginia Polytechnic Institute and State University, USA;1. Department of Economics, University of Pretoria, Pretoria, South Africa;2. Abdullah Gul University, Faculty of Leadership and Management, Department of Economics, 38080, Kayseri, Turkey;1. Chemical Engineering Program, Department of Advanced Science and Engineering, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan;2. Department of Biotechnology and Veterinary, Vocational School, Gadjah Mada University, Sekip Unit 1 Catur Tunggal, Depok Sleman, D.I. Yogyakarta 55281, Indonesia;3. Faculty of Chemistry, University of Science, Vietnam National University Ho Chi Minh City, Ho Chi Minh City 72711, Viet Nam |
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| Abstract: | Thin carbon stripper foils used in high-intensity proton accelerators and heavy-ion accelerators must have long lifetimes. Thin carbon foils were fabricated by ion-beam sputtering using reactive and inert gas ions. The lifetime of the foils was measured using a KEK 650-keV high-intensity DC H? (negative hydrogen ion) beam; changes in the foil thickness and surface deformations during irradiation were investigated. The lifetime of a typical stripper foil fabricated by heavy-ion-beam (Ar and Kr) sputtering was 60–70 times longer than that of the best commercially available foils. This paper reports a fabrication method for carbon stripper foils, along with an investigation of their lifetimes and changes in foil thickness during beam irradiation. |
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