Abstract DEMO requires a novel fuel cycle architecture with Direct Internal Recycling in order to drastically minimize the tritium inventory. One central element of this architecture is the separation (and compression) of hydrogenic gas from the exhaust gas stream, close to the divertor, which can immediately be recycled to feed the matter injection systems. The hydrogen-selective separation will be achieved by the metal foil pump, a novel pump type relying on the effect of superpermeation, which is a first-of-its-kind application for the conditions to be matched for DEMO. To achieve a convincing performance, each hydrogen particle has to undergo successfully a series of processes before it is separated and pumped. To support the design of such a pump, a comprehensive R&D programme has been started which is currently being focused on (i) the plasma source, (ii) the transport of the suprathermal hydrogen, and (iii) the material and surface aspects of the foil. The experimental and modelling tools are described, examples of recent results are presented and a first prediction on the performance is derived.

中文翻译：

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为DEMO开发金属箔泵的研发计划进展

摘要 DEMO 需要一种具有直接内部回收的新型燃料循环架构，以最大限度地减少氚库存。这种架构的一个核心要素是从废气流中分离（和压缩）氢气，靠近偏滤器，可以立即回收以供给物质注入系统。氢选择性分离将通过金属箔泵实现，金属箔泵是一种依靠超渗透作用的新型泵，这是与 DEMO 匹配条件的同类应用中的首创。为了获得令人信服的性能，每个氢粒子在被分离和泵送之前必须成功地经历一系列过程。为了支持这种泵的设计，全面的研发 D 计划已经启动，目前专注于 (i) 等离子体源，(ii) 超热氢的传输，以及 (iii) 箔的材料和表面方面。描述了实验和建模工具，提供了最近结果的示例，并得出了对性能的第一个预测。