Abstract

Xenon is a potential candidate as a pedestal and edge radiator in DEMO, but it is considered troublesome in cases where larger amounts have to be handled in the fuel cycle. Hence, direct and efficient codeposition inside the confined plasma with the fuel injected by means of solid cryogenic pellets is regarded as more favorable than simple gas puffing. At ASDEX Upgrade, investigations are underway to develop a versatile reactor-relevant pellet actuator. Equipped with an accordingly set up pellet launching system and well diagnosed, this all-metal-wall tokamak is well suited for this task. Here, we report on efforts to produce and inject pellets made from deuterium with a reasonable amount of admixed xenon. Results indicate xenon supply via carrier fueling pellets is possible while showing advanced performance. Compared to xenon gas puffing where long latency is observed, presumably due to wall sticking, doped pellets provide much shorter response times. Hence, this first exploration suggests fueling pellets with admixed auxiliary gases can be a versatile, efficient, and fast actuator for additional control features such as, e.g., radiative plasma cooling.

摘要

氙气可能是DEMO中的基座和边缘散热器，但是在燃料循环中必须处理大量的氙气时，这被认为是麻烦的。因此，与通过简单的气体吹气相比，利用固态低温微丸喷射的燃料将密闭等离子体内部直接且有效地共沉积被认为是更有利的。在ASDEX升级项目中，正在进行研究以开发与反应堆相关的多功能粒料促动器。配备相应设置的药丸发射系统并经过良好诊断，这种全金属壁托卡马克非常适合此任务。在这里，我们报告了生产和注入氘与合理量的混合氙气制成的颗粒的努力。结果表明，氙气可以通过载体燃料球粒供应，同时表现出先进的性能。与观察到较长的潜伏期（可能是由于壁粘滞）导致的氙气膨化相比，掺杂的小球提供了更短的响应时间。因此，该首次探索表明，具有混合辅助气体的燃料颗粒可以是用于附加控制特征（例如辐射等离子体冷却）的通用，高效且快速的执行器。