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VACUUM ›› 2026, Vol. 63 ›› Issue (3): 16-22.doi: 10.13385/j.cnki.vacuum.2026.03.02

• Thin Film • Previous Articles     Next Articles

Study on the Uniformity of NEG Thin Film Deposition on the Inner Wall of a Sputter Ion Pump Chamber

ZHU Yunhe1, ZANG Haotian1, ZHENG Mengxin2, WANG Xiaodong1   

  1. 1. School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China;
    2. China National Machinery Industry Corporation, Beijing 100080, China
  • Received:2025-10-12 Online:2026-05-25 Published:2026-06-01

Abstract: The sputter ion pump (SIP) is a vacuum device widely used in ultra-high and extreme-high vacuum environments due to its simple structure, long service life, oil-free operation, and vibration-free, noiseless performance. Embedding non-evaporable getter (NEG) materials into the SIP core is an effective approach to enhance its ultimate vacuum level. In this study, a novel embedded structure was developed using direct current magnetron sputtering with dual coaxial cylindrical ring magnet targets to deposit NEG thin films on the inner wall of the SIP chamber. This configuration not only reduces outgassing from the chamber wall but also enhances the adsorption of active gases, thereby improving the ultimate vacuum performance of SIP. A Ti-Zr-V alloy with a fixed composition was selected as the NEG material. The study focuses on the uniformity of film thickness, investigating the effects of working pressure and sputtering power on both lateral and vertical uniformity of the films. Results show that increasing working pressure and sputtering power improves the uniformity, with a more pronounced effect in the vertical direction. Moreover, the ratio between target-substrate distance (D) and substrate width (W), defined as β, significantly influences the uniformity of the deposited film.

Key words: non-evaporable getter (NEG) thin film, sputter ion pump, magnetron sputtering, film thickness uniformity

CLC Number:  TB79

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