THPH015 　真空　 8月1日 百周年時計台記念館 国際交流ホール 13:30-15:30

Secondary electron yields from thermal-sprayed metal surfaces and Monte Carlo simulation of SEY from rough surfaces

○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)

We coated the copper or aluminum substrates with copper, aluminum, tungsten and titanium by thermal spraying, and investigated the relations between their secondary electron yield (SEY or δ), roughness and surface composition. After enough conditioning, most of the values of maximum SEY (δmax) were lower, and the energies of the primary electrons (Ep) that gives δmax were higher than the flat surfaces. For the copper samples, the δmax and the arithmetical mean height (Sa) were roughly in inverse proportion, and the δmax and Sa divided by the developed interfacial area ratio (Sdr) were in inverse proportion to some extent. Besides, we used Monte Carlo method to simulate the SEY of rough surface. Now we could only input a relatively simple surface, so there were still some differences from the real thermal-sprayed surfaces. At present, the surface with trapezoidal protrusion is the structure most like the metal particles melting on the surface. The simulation results showed that there was an apparent inverse relationship between δmax and Sdr, therefore the relationship between δmax and Sa/Sdr was opposite to the experimental results.