Experimental research on the adsorbent performance in neutral beam injector cryopump

IF 2 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Fusion Engineering and Design Pub Date : 2025-08-21 DOI:10.1016/j.fusengdes.2025.115398

Qianxu Wang , Yuanlai Xie , Fang Wang , Yufan Li

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Abstract

To enhance the performance of the neutral beam injector (NBI) cryopump, experimental research was conducted on cryogenic adsorbent materials to select the ones with better performance. In the paper, three types of activated carbon materials prepared by different processes were selected and named as No 1, No 2 and No 3, respectively. Through structural analysis and cryogenic adsorption performance experiments, the internal structural characteristics of the activated carbon materials were analyzed, meanwhile their performance was evaluated. The results indicate that No 1 has hierarchical pore structures combining micropores and mesopores, its adsorption isotherm belongs to Type IV and accompanied by capillary condensation phenomena. At the pressure of 1E-3 Pa, its hydrogen pumping speed can reach 1.07E4 L/s. No 2 and No 3 are mainly composed of micropores, their adsorption isotherms belong to type I. At the pressure of 1E-3 Pa, the hydrogen pumping speed of No.3 can reach 1.05E4 L/s. In addition, the hydrogen pumping speed of the activated carbon materials under mixed gas intake conditions was analyzed, meanwhile the effect of the cryogenic adsorption planes temperature on their pumping speed and adsorption capacity were also studied. The research results reveal the adsorption characteristics of activated carbon and can provide reference for the selection of adsorbent materials for NBI cryopumps.

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中性束注入低温泵吸附剂性能的实验研究

为了提高中性束注入器低温泵的性能，对低温吸附剂材料进行了实验研究，选择了性能较好的吸附剂。本文选取了三种不同工艺制备的活性炭材料，分别命名为No . 1、No . 2、No . 3。通过结构分析和低温吸附性能实验，分析了活性炭材料的内部结构特征，并对其性能进行了评价。结果表明，1号煤具有微孔和中孔相结合的分层孔隙结构，吸附等温线属于ⅳ型，并伴有毛细冷凝现象。在1e - 3pa压力下，其抽氢速度可达1.07E4 L/s。2号和3号主要由微孔组成，其吸附等温线为ⅰ型，在1e - 3pa压力下，3号的抽氢速度可达1.05E4 L/s。此外，还分析了混合进气条件下活性炭材料的吸氢速度，同时研究了低温吸附面温度对吸氢速度和吸附能力的影响。研究结果揭示了活性炭的吸附特性，可为NBI低温泵吸附剂材料的选择提供参考。

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来源期刊

Fusion Engineering and Design 工程技术-核科学技术

CiteScore

3.50

自引率

23.50%

发文量

275

审稿时长

3.8 months

期刊介绍： The journal accepts papers about experiments (both plasma and technology), theory, models, methods, and designs in areas relating to technology, engineering, and applied science aspects of magnetic and inertial fusion energy. Specific areas of interest include: MFE and IFE design studies for experiments and reactors; fusion nuclear technologies and materials, including blankets and shields; analysis of reactor plasmas; plasma heating, fuelling, and vacuum systems; drivers, targets, and special technologies for IFE, controls and diagnostics; fuel cycle analysis and tritium reprocessing and handling; operations and remote maintenance of reactors; safety, decommissioning, and waste management; economic and environmental analysis of components and systems.