Speaker
Description
The moderator-reflector system of the CSNS target station has been operating continuously for 8 years without any failure. In the CSNS-II project, the MR plug will be replaced as a whole. At present, the design and manufacturer selection of all key components of the MR plug have been completed, and the research and development of all key process technologies have also been finished. All equipment manufacturing is currently under intense progress.
In terms of structural design of the new MR plug, detailed structural optimization has been carried out to meet the requirement of independent replacement of the moderator. The cooling channels of the reflector have been optimized to address the issue of high heat deposition removal in confined spaces, and corresponding manufacturing processes have been developed. To achieve a more reliable moderator, we tested and analyzed the mechanical properties of 6061-T6 aluminum alloy welded joints at 20 K, which provides a basis for further design optimization of the moderator. In addition, we have developed gadolinium?boron?aluminum decoupling materials with different compositions, offering technical support for the design of decoupled moderators with higher resolution.