Abstract SST-1 is a Steady State Superconducting Tokamak for a proposed plasma discharge of long duration. This plasma device has two vacuum vessels, the cryostat and the vacuum vessel (VV). Cryostat houses the superconducting magnet systems (TF and PF coils), LN2 cooled thermal shields and hydraulics for these circuits and the plasma will be confined inside the VV [ 1 ]. To have plasma discharges, ultra-high vacuum (UHV) is required to be maintained in VV [ 2 ]. To attain a vacuum level of ∼1 × 10-8 mbar in VV, the plasma-facing components (PFCs) are baked to a temperature of 250 °C and the vacuum vessel is baked to a temperature of 150 °C to remove impurities from the bulk of materials which are adsorbed/absorbed. In baking, the gas load of mainly water vapour and hydrogen gas is increased. The pumping system for vacuum vessel consists of six sets of turbo-molecular pumps (each set consist of 3 TMP) and one cryopump which is sufficient to achieve a vacuum of

中文翻译：

---

SST-1托卡马克液氮冷却吸附低温泵的设计与分析

摘要 SST-1 是一种稳态超导托卡马克，用于长期等离子放电。该等离子设备有两个真空容器，即低温恒温器和真空容器 (VV)。低温恒温器装有超导磁体系统（TF 和 PF 线圈）、LN2 冷却隔热罩和这些回路的液压系统，等离子体将被限制在 VV 内 [1]。要进行等离子体放电，需要在 VV 中保持超高真空 (UHV) [2]。为了在 VV 中达到 ~1 × 10-8 mbar 的真空水平，面向等离子体的组件 (PFC) 被烘烤到 250 °C 的温度，真空容器被烘烤到 150 °C 的温度以去除杂质。被吸附/吸收的大部分材料。在烘烤时，主要是水蒸气和氢气的气体负荷增加。