WEP009 　加速器土木・放射線防護/真空　 8月11日 会議室P 13:10 - 15:10

Pd、Pd/TiZrVコーティングした銅チューブの放射光刺激脱離の評価

Synchrotron radiation-stimulated desorption from Pd or TiZrV-Pd coated copper tubes

○金 秀光，谷本 育律，内山 隆司（高エネルギー加速器研究機構），岡野 誠（日本電子）

○Xiuguang Jin, Yasunori Tanimoto, Takashi Uchiyama (High Energy Accelerator Research Organization), Makoto Okano (JEOL)

In non-evaporable getter coating, the repeated air venting and activation result in the oxygen enrichment at near surface with resultant degradation of the pumping performance. To solve this problem, the application of a thin palladium (Pd) layer to a getter film has been proposed as a means of preventing oxidation of the getter layer so as to address the issue of limited operational lifespans. In present study, the Pd, or Pd/TiZrV coated copper tubes were prepared using a magnetron sputtering apparatus and synchrotron radiation-stimulated desorption was investigated at PF BL21. The PSD results for the Pd or Pd/TiZrV films are presented for the first time. Following activation, Pd and Pd/TiZrV films exhibit initial desorption yields that are more than two orders of magnitude lower than those obtained from uncoated copper or stainless steel. The desorption yield from the Pd/TiZrV film is also much lower than that from the TiZrV film. Compared to the TiZrV film, the Pd film show a higher H2 pumping rate and is more likely to release H2 and CO during activation. These characteristics are considered to have reduced the photon-stimulated desorption yield of the Pd/TiZrV film.