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- W1996174924 abstract "During the past decade, intense experimental studies on the heavy-ion induced molecular desorption were performed in several particle accelerator laboratories worldwide in order to understand and overcome large dynamic pressure rises caused by lost beam ions. Different target materials and various coatings were studied for desorption and mitigation techniques were applied to heavy-ion accelerators. For the upgrade of the CERN injector complex, a coating of the Super Proton Synchrotron (SPS) vacuum system with a thin film of amorphous carbon is under study to mitigate the electron cloud effect observed during SPS operation with the nominal proton beam for the Large Hadron Collider (LHC). Since the SPS is also part of the heavy-ion injector chain for LHC, dynamic vacuum studies of amorphous carbon films are important to determine their ion induced desorption yields. At the CERN Heavy Ion Accelerator (LINAC 3), carbon-coated accelerator-type stainless steel vacuum chambers were tested for desorption using $4.2text{ }text{ }mathrm{MeV}/mathrm{u}$ ${mathrm{Pb}}^{54+}$ ions. We describe the experimental setup and method, present the results for unbaked and baked films, and summarize surface characterizations such as secondary electron yield measurements, x-ray photoemission spectroscopy, and scanning electron microscopy studies. Finally, we present a high-energy scaling of lead-ion induced desorption yields from the $mathrm{MeV}/mathrm{u}$ to $mathrm{GeV}/mathrm{u}$ range." @default.
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- W1996174924 date "2011-10-11" @default.
- W1996174924 modified "2023-09-26" @default.
- W1996174924 title "Heavy-ion induced desorption yields of amorphous carbon filmsbombarded with4.2 MeV/ulead ions" @default.
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- W1996174924 doi "https://doi.org/10.1103/physrevstab.14.101001" @default.
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