Assessment of the JT-60SA divertor cryopump performance
Assessment of the JT-60SA divertor cryopump performance
复制标题
JT-60SA 偏滤器低温泵性能评估
DOI：
10.1016/j.fusengdes.2018.02.099
复制
发表时间：
2018
影响因子：
1.7
通讯作者：
S. Sakurai
中科院分区：
文献类型：
--
作者：
Xueli Luo;M. Scannapiego;C. Day;S. Sakurai
低温泵送系统是决定JT-60SA运行窗口的关键部件之一。设想使用工作在3.8 K的冷凝泵，并且需要适当的用水和80 K的气体氦冷却的热屏蔽，以便将它们安装在离环面很近的地方，以利用高泵速。本文采用蒙特卡罗模拟方法对40°扇区内的一个完整分流器低温泵装置进行了研究。根据所采取的假设，发现d2的一个低温泵机组的泵速在14.8 m3/s和18.1 m3/s之间。此外，还评估了低温泵冷凝管在稳态名义运行时的热负荷，以及大量注气事件后的热负荷和瞬态行为。目前的设计能够满足泵送、冷却和再生的要求。
The cryogenic pumping system is one of the key components that define the operational window of JT-60SA. It is envisaged to utilize condensation pumps that work at 3.8 K, and proper thermal shields cooled with water and 80 K gaseous helium are necessary to allow having them installed at short distance to the torus in order to exploit high pumping speeds. In this paper, one complete divertor cryopump unit in a 40° sector is studied by Monte Carlo simulation. The pumping speeds of one cryopump unit for D2were found to be between 14.8 m3/s and 18.1 m3/s depending on the assumptions taken. In addition, the heat loads to the cryopump condensation pipes during steady state nominal operation, as well as the heat loads and transient behavior after massive gas injection events are assessed. The present design can fulfil the requirement of pumping, cooling and regeneration.