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A review on two previous divertor target concepts for DEMO: mutual impact between structural design requirements and materials performance

机译：对DEMO先前的两个偏滤器目标概念的回顾：结构设计要求和材料性能之间的相互影响

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摘要

Development of a diverter target with a sufficient capability of power exhaust is a crucial prerequisite for the realization of a fusion power plant. While the design and technology for divertor target has been successfully developed for ITER, the applicability of this concept is not necessarily assured yet for DEMO mainly because the neutron irradiation dose expected for the DEMO divertor will be an order of magnitude higher than that of the ITER divertor. The possible embrittlement of structural heat sink materials due to irradiation is likely to restrict the structural performance and the operational flexibility of a target component to a considerable extent. For judgment of design feasibility of a target concept a quantitative evaluation of the thermal and structure mechanical performance is needed. In this article, a review on two representative target design concepts considered for the DEMO divertor is presented. Emphasis is put on the mutual impact between the design requirements and the performance of structural materials. Water-cooled and helium-cooled concepts are discussed considering two baseline heat sink materials, CuCrZr alloy and tungsten, respectively. Conclusions are derived from the critical features of the heat sink performance in terms of structural reliability, design/material interface and further R&D needs.
机译：开发具有足够动力排放能力的分流目标是实现聚变电站的关键先决条件。尽管已经成功地为ITER开发了用于偏滤器靶的设计和技术，但仍未确保该概念对DEMO的适用性，这主要是因为DEMO偏滤器的预期中子辐照剂量将比ITER高一个数量级。转向器。由于辐射而导致的结构散热片材料可能会变脆，这可能会在很大程度上限制目标组件的结构性能和操作灵活性。为了判断目标概念的设计可行性，需要对热和结构机械性能进行定量评估。在本文中，将对DEMO偏滤器考虑的两个代表性目标设计概念进行回顾。重点放在设计要求和结构材料性能之间的相互影响上。讨论了分别考虑两种基准散热器材料CuCrZr合金和钨的水冷和氦冷概念。结论来自散热器性能的关键特征，包括结构可靠性，设计/材料界面以及进一步的研发需求。

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