Research on the Desorption Yields of Oxygen-free Copper Under Low Temperature Bombarded with Xe23+
JIAO Jiqiang1,2, MENG Jun1,2,3,*, LUO Cheng1,2,3, CHAI Zhen1,3, XIE Wenjun1
1 Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China 2 Advanced Energy Science and Technology Guangdong Laboratory, Huizhou 516003, Guangdong, China 3 School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
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.
焦纪强, 蒙峻, 罗成, 柴振, 谢文君. Xe23+离子束轰击低温工况下的无氧铜表面解吸性能研究[J]. 材料导报, 2024, 38(1): 22040201-5.
JIAO Jiqiang, MENG Jun, LUO Cheng, CHAI Zhen, XIE Wenjun. Research on the Desorption Yields of Oxygen-free Copper Under Low Temperature Bombarded with Xe23+. Materials Reports, 2024, 38(1): 22040201-5.
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2024, Vol. 38 
