Development of new foil compounded from carbon nanotube and sputter-deposition carbon

New Carbon-Nanotube-Sputter-Deposition-Carbon foils (CNT-SDC-foils) were developed and practically used for the U beam time at RIBF from October to December 2011. The lifetimes of these new foils were drastically extended and stable U beams with high intensity were successfully provided to the user. The lifetime of the CNT-SDC-foils were 2 - 5 C, which was 100 times longer than those of static C-foils ever used. The qualitative analysis of the CNT-SDC-foils clearly showed that the CNT structure and bundles were broken by beam irradiation. In addition, it was found that CNT bundles in a CNT-SDC-foil were grown after carbon deposition procedure. This structure was considered to be a reason that CNT-SDC-foils kept advantages of both of CNT and SDC foil. (author)