Quantitative monitoring of the stripper foil degradation in the 3-GeV rapid cycling synchrotron of the Japan proton accelerator research complex

Saha, P. K.; 吉本 政弘; 山崎 良雄; 發知 英明; 原田 寛之; 林 直樹; 山本 風海; 金正 倫計; 入江 吉郎*

Journal of Radioanalytical and Nuclear Chemistry, 299(2), p.1041 - 1046, 2014/02

BB2012-1406.pdf:0.47MB

https://doi.org/10.1007/s10967-013-2636-2

The 3-GeV RCS of the J-PARC requires a long lifetime stripper foil in order to ensure a stable operation. A sudden failure of the foil breaks the accelerator availability as well as raised maintenance issues. A foil degradation (such as foil thinning, pinhole formation) could be a signal of the foil breaking. An efficient monitoring system is needed in order to determine a proper lifetime of a foil for the RCS 1 MW operation so as to avoid any sudden foil failure. During the past 4 months operation of the RCS with about 200 kW beam power to the MLF and nearly 300 kW equivalent beam power to the MR, a single foil was used but there was no observable degradation so far.