Abstract DEMO is a first-of-a-kind DEMOnstration fusion power plant [1] , [2] and is intended to follow the ITER experimental reactor. The main goal of DEMO will be to demonstrate the possibility to produce electric energy for the grid from the fusion reaction early in the second half of the century. The injection of high energy neutral (1 MeV) particle beams is one of the main tools to heat the plasma up to fusion conditions, control the plasma burn phase and ramp the plasma down. Within the EUROfusion Framework a conceptual design of the Neutral Beam Injector (NBI) for the DEMO fusion reactor is currently being developed. Thereby, Reliability, Availability, Maintainability and Inspectability (RAMI) have to be taken into consideration for the conceptual design of the DEMO NBI, together with the exploitation of the currently available return of experience from the ITER NBIs. Comparing the failure risk of two different source concepts due to the considered failure modes has allowed for further design developments aiming at exploiting the advantages of the modular approach while minimizing its drawbacks.

中文翻译：

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DEMO 中性射束注入器射束源的 RAMI 评估

摘要 DEMO 是首个 DEMOnstration 聚变电站 [1] , [2] ，旨在跟随 ITER 实验堆。DEMO 的主要目标将是展示在本世纪下半叶早期通过聚变反应为电网生产电能的可能性。高能中性 (1 MeV) 粒子束的注入是将等离子体加热到聚变条件、控制等离子体燃烧阶段和使等离子体下降的主要工具之一。在 EUROfusion 框架内，目前正在开发用于 DEMO 聚变反应堆的中性射束注入器 (NBI) 的概念设计。因此，在 DEMO NBI 的概念设计中必须考虑可靠性、可用性、可维护性和可检查性 (RAMI)，以及利用 ITER NBI 当前可用的经验回报。由于所考虑的故障模式，比较两个不同源概念的故障风险允许进一步设计开发，旨在利用模块化方法的优点，同时最大限度地减少其缺点。