WEP113 　真空　 8月8日 大展示ホール 13:10 - 15:10

溶射した金属表面からの二次電子放出率

Secondary electron yield by thermal sprayed metal surface

○姚 慕蠡（総研大），末次 祐介，柴田 恭（KEK, 総研大），久松 広美（KEK），石橋 拓弥（KEK, 総研大），照井 真司（KEK），西殿 敏朗，地場 弘行（コミヤマエレクトロン株式会社），澤畠 孝博，石井 晃嗣（MTC）

○Mulee Yao (SOKENDAI), Yusuke Suetsugu, Kyo Shibata (KEK, SOKENDAI), Hiromi Hisamatsu (KEK), Takuya Ishibashi (KEK, SOKENDAI), Shinji Terui (KEK), Toshiro Nishidono, Hiroyuki Chiba (Komiyama Electron Corp.), Takahiro Sawahata, Kouji Ishii (MTC)

The Electron Cloud Effect (ECE) is a serious issue in the positron and proton rings of the high-energy particle accelerators. One of the solutions is preparing a material with a low Secondary Electron Yield (SEY or δ) on the inner surface of beam pipe. It is known that rough surfaces generally have a lower SEY than smooth surfaces. Therefore we coated the copper and aluminum substrates with copper, aluminum, tungsten and titanium by thermal spraying, which is easy to practice and has been widely used in industry. We measured the δ of fourteen samples with different sprayed conditions after a conditioning (electron-beam bombardment) time of 48 hours. The values of δmax were within the range of 0.7661 to 1.683. We found that the surface of different materials shows different changing trends in the change of the sprayed conditions. And in the same material, the δmax seemed to have weak dependence on the surface roughness and other surface parameters. Further surface analysis should be done to find the true causes. Here we will report the results of SEY measurement using thermal sprayed metal surfaces and discuss the dependence on the roughness and the compositions of surfaces.