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Silver-indium-cadmium decoupler and liner

Harada, Masahide   ; Saito, Shigeru   ; Teshigawara, Makoto   ; Kawai, Masayoshi*; Kikuchi, Kenji; Watanabe, Noboru; Ikeda, Yujiro

As a decoupler material for intense neutron sources, we proposed a new composite material based on the (n,$$gamma$$) reaction, silver-indium-cadmium alloy (AIC), which had lettle helium gas production rate and higher decoupling energy ($$sim$$1eV). We compared an AIC decoupler with Cd and B$$_4$$C decouplers from various viewpoints and finally selected AIC as decoupler and liner materials. In the current design, we adopted AIC of 2.5mm thick with a composition of Ag-35wt%Cd and 0.5mm thick with Ag-15wt%In. A decoupler and a liner can be bonded to structural material (Al-alloy) by HIP for water cooling through Al-alloy. To find the optimal HIP condition, small pieces of Ag-Cd and Ag-In ($$phi$$20$$times$$2mm) were enclosed in Al-alloy capsules ($$phi$$22mm, 3mm thick bottom plate and 1mm thick cap) of several Al-alloys. The optimal condition was found to be 500$$^{circ}$$C with a holding time of 60 minutes under a fixed pressure of 100MPa. Large pieces (Ag-Cd: 200$$times$$200$$times$$2.5mm, Ag-In: 200$$times$$200$$times$$0.5mm, A5083 and A6061: 210$$times$$210$$times$$21mm) were also tested aiming at more realistic size conditions.



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