Abstract Cryosorption pumps are the only possible solution to pump helium gas in Tokamak. In cryosorption pump, due to weak van der Walls forces the adsorbate gas molecules are held by the adsorbent well above the boiling point of the adsorbate gas. Therefore selection of best adsorbent is of utmost importance for the optimum performance of cryosorption pump towards the pumping of helium gas. In this paper, we report the pore size distribution and surface area of different activated carbon adsorbents to arrive at the best activated carbon for the development of cryosorption panel. Also probably for the first time, an attempt has been made to estimate the thermal conductivity of liquid helium based small size prototype cryopanel. The thermal conductivity of the panel has been improved by mixing the fine aluminium powder as filler to the epoxy adhesive. From the experimental studies it is found that KCC/IIS01 is the best adsorbent towards the development of cryosorption pump. Mixing of 35% fine aluminium powder as a filler to the epoxy adhesive improves the thermal conductivity of the cryopanel by ~14% and in turn enhances the pumping speed by ~2.35 times as reported in our earlier studies.

中文翻译：

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活性炭对低温吸附泵性能改进的研究

摘要 低温吸附泵是托卡马克泵氦气的唯一可能解决方案。在低温吸附泵中，由于范德壁力较弱，吸附气体分子被吸附剂保持在远高于吸附气体沸点的位置。因此，选择最佳吸附剂对于低温吸附泵泵送氦气的最佳性能至关重要。在本文中，我们报告了不同活性炭吸附剂的孔径分布和表面积，以获得用于开发低温吸附板的最佳活性炭。也可能是第一次尝试估计基于液氦的小型原型低温板的热导率。通过将细铝粉作为填料混合到环氧树脂粘合剂中，提高了面板的导热性。实验研究发现，KCC/IIS01是发展低温吸附泵的最佳吸附剂。将 35% 的细铝粉作为填充剂与环氧树脂粘合剂混合可将低温板的热导率提高约 14%，进而将泵送速度提高约 2.35 倍，如我们之前的研究报告所述。