Preliminary study on in-situ activation of NEG coated vacuum chamber

Ma Wenjing; Zhao Zhuang; Zhang Shancai; Wang Sihui; Hong Yuanzhi; Fan Le; Wang Chenghong; Wei Wei

doi:10.11884/HPLPB202234.220030

Volume 34 Issue 8

Jul. 2022

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Ma Wenjing, Zhao Zhuang, Zhang Shancai, et al. Preliminary study on in-situ activation of NEG coated vacuum chamber[J]. High Power Laser and Particle Beams, 2022, 34: 084005. doi: 10.11884/HPLPB202234.220030

Citation:

Ma Wenjing, Zhao Zhuang, Zhang Shancai, et al. Preliminary study on in-situ activation of NEG coated vacuum chamber[J]. High Power Laser and Particle Beams, 2022, 34: 084005. doi: 10.11884/HPLPB202234.220030

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Preliminary study on in-situ activation of NEG coated vacuum chamber

doi: 10.11884/HPLPB202234.220030

1.
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, China
2.
Institute of Advanced Science Facilities, Shenzhen 518107, China

Received Date: 2022-01-19
Rev Recd Date: 2022-05-25

Available Online: 2022-05-30

Publish Date: 2022-07-20

Abstract

Abstract

The Hefei Advanced Light Facility (HALF), which includes an injector and a Diffraction Limited Storage Ring (DLSR), needs ultrahigh vacuum environment to satisfy the lifetime of beam. The small-diameter vacuum chamber coated with NEG (Non-Evaporable Getter) not only saves space, but also has a high pumping speed, which can well meet the demand of obtaining ultra-high vacuum in diffraction-limited devices. The NEG films need to be activated at a certain temperature to get the pumping speed. Therefore, the NEG film activation method and process is important to ensure the safety of the other system components, such as the magnets. Based on the appropriate activation temperature of the coated NEG films, a temperature analysis model was applied to simulate the temperature distribution of the NEG coated vacuum chamber and the magnet during in-situ activation at the temperatures of 180 ℃ and 200 ℃, respectively. The oxygen-free silver bearing copper (OFS) vacuum tubes were baked out by polyimide (PI) heaters and the temperature of the tube and the magnet pole was measured. The maximum temperature measured at the magnet pole was about 40 ℃, which confirmed the safety of the quadrupole magnet. This work will be a solution and basis of in-situ activation of the NEG-coated vacuum chamber in the Hefei Advanced Light Facility.
- diffraction limited storage ring,
- ultrahigh vacuum,
- small diameter,
- the NEG coated vacuum chamber,
- in-situ activation

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References(17)

References

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