Xe^(23+)离子束轰击低温工况下的无氧铜表面解吸性能研究  

Research on the Desorption Yields of Oxygen-free Copper Under Low Temperature Bombarded with Xe^(23+)

作　　者：焦纪强 蒙峻[1,2,3] 罗成 柴振[1,3] 谢文君 JIAO Jiqiang;MENG Jun;LUO Cheng;CHAI Zhen;XIE Wenjun(Institute of Modern Physics,Chinese Academy of Science,Lanzhou 730000,China;Advanced Energy Science and Technology Guangdong Laboratory,Huizhou 516003,Guangdong,China;School of Nuclear Science and Technology,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]先进能源科学与技术广东省实验室,广东惠州516003 [3]中国科学院大学核科学与技术学院,北京100049

出　　处：《材料导报》2024年第1期131-135,共5页Materials Reports

基　　金：兰州重离子加速器运行维护(Y9HIRLL100);中国科学院重大科技基础设施项目(E229541YWG)。

摘　　要：强流重离子加速器运行时产生动态真空效应引起束流寿命缩短,需安装无氧铜束流准直器来降低该效应。为探究无氧铜材料在离子束轰击下的解吸性能,本工作设计并研制了满足低温工况的解吸率测试装置,在兰州重离子加速器国家实验室利用Xe^(23+)离子束完成了无氧铜温度在4.2 K、20 K、77 K和300 K,以及束流能量为0.58 MeV/u、0.96 MeV/u和1.3 MeV/u的在束试验。结果表明,离子束轰击无氧铜表面时解吸出最多的分子为H_(2),其次分别为H2O、CO、CO_(2)、Ar和O_(2);当温度为4.2 K、束流能量为0.58 MeV/u时无氧铜解吸出H2的比例为87.74%。在同一能量下,随着无氧铜表面温度的升高,解吸率呈增加趋势,能量为0.58 MeV/u时,4.2 K下无氧铜的解吸率仅为25 mol/ion,小于300 K时的600 mol/ion,表明温度越高其解吸产额越大。在同一温度下,随着束流能量的升高无氧铜表面解吸率增加,但增加趋势逐渐减缓,解吸产额趋向饱和。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 Xe^(23+)ions with 0.58 MeV/u,0.96 MeV/u and 1.3 MeV/u.The result showed that the main desorbed molecule was H_(2),and followed by H_(2)O,CO,CO 2,Ar and O_(2) under the beam bombarded oxygen-free copper conditions.Besides,the proportion of oxygen-free copper desorbed H_(2) 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.

关 键 词：强流重离子加速器 无氧铜 低温工况 解吸率 在束试验 

分 类 号：TB31[一般工业技术—材料科学与工程] TB741