Xe<sup>23+</sup>离子束轰击低温工况下的无氧铜表面解吸性能研究

doi:10.11896/cldb.22040201

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Abstract The dynamic vacuum effect during the operation of high intensity heavy-ion accelerator facility, which destroys ultra-high vacuum stable environment and causes the beam lifetime to decrease. It is necessary to install an oxygen-free copper collimator to minimizing the dynamic va-cuum effect. To research the desorption yields of oxygen-free copper under different temperature conditions, a low temperature desorption yields test system was developed. Beam experiments of oxygen-free copper at 4.2 K, 20 K, 77 K and 300 K were competed in Lanzhou Heavy Ion Accelerator National Laboratory using continuous Xe²³⁺ ions with 0.58 MeV/u, 0.96 MeV/u and 1.3 MeV/u. The result showed that the main desorbed molecule was H₂, and followed by H₂O, CO, CO₂, Ar and O₂ under the beam bombarded oxygen-free copper conditions. Besides, the proportion of oxygen-free copper desorbed H₂ was 87.74% when the temperature was 4.2 K and the energy was 0.58 MeV/u. At the same energy, the desorption yields were increased gradually with the oxygen-free copper temperature rising. The desorption yield of oxygen-free copper was only 25 mol/ion at 4.2 K and 0.58 MeV/u, which was less than 600 mol/ion at 300 K, indicating that the higher oxygen-free copper temperature, the greater the desorption yield. At the same temperature, the desorption yields were increased with the increasing of beam energy, but the trend slow down and the desorption yields tends to be saturated.

Key words： high intensity heavy-ion accelerator oxygen-free copper low temperature desorption yield beam experiment

Published: 10 January 2024 Online: 2024-01-16

CLC number:	TB31
	TB741

Fund:Operation and Maintenance of Lanzhou Heavy Ion Accelerator (Y9HIRLL100) and the Major Scientific and Technological Infrastructure of Chinese Academy of Sciences Project (E229541YWG).

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	JIAO Jiqiang
	MENG Jun
	LUO Cheng
	CHAI Zhen
	XIE Wenjun

Cite this article:

JIAO Jiqiang,MENG Jun,LUO Cheng, et al. Research on the Desorption Yields of Oxygen-free Copper Under Low Temperature Bombarded with Xe²³⁺[J]. Materials Reports, 2024, 38(1): 22040201-5.

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http://www.mater-rep.com/EN/10.11896/cldb.22040201 OR http://www.mater-rep.com/EN/Y2024/V38/I1/22040201

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