The design of the cryogenic system for the DIII-D advanced divertor cryocondensation pump is presented. The advanced divertor incorporates a baffle chamber and bias ring located near the bottom of the DIII-D vacuum vessel. A 50000-l/s cryocondensation pump will be installed underneath the baffle for plasma particle exhaust. The pump consists of a liquid-helium-cooled tube operating at 4.3 K and a liquid-nitrogen-cooled radiation shield. Liquid helium is fed by forced flow through the cryopump. Compressed helium gas flowing through the high-pressure side of a heat exchanger is regeneratively cooled by the two-phase helium leaving the pump. The cooled high-pressure gaseous helium is then liquefied by a Joule-Thomson expansion valve. The liquid is returned to a storage dewar. The liquid nitrogen for the radiation shield is supplied by forced flow from a bulk storage system. Control of the cryogenic system is accomplished by a programmable logic controller.
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机译：介绍了DIII-D先进的分流器低温冷凝泵的低温系统设计。先进的分流器在DIII-D真空容器底部附近装有挡板室和偏置环。将在挡板下方安装50000 l / s的低温冷凝泵，以排出血浆颗粒。该泵由工作在4.3 K的液氦冷却管和液氮冷却的辐射防护屏组成。液氦通过强制流过低温泵而供入。流经热交换器高压侧的压缩氦气由离开泵的两相氦气进行再生冷却。然后，通过焦耳-汤姆森膨胀阀将冷却的高压气态氦液化。液体返回到杜瓦瓶中。辐射屏蔽的液氮由来自大容量存储系统的强制流动提供。低温系统的控制由可编程逻辑控制器完成。
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