Effect of pre-irradiation on corrosion performance of beryllium in BEPC II/BES III and CEPC beam pipe
Effect of pre-irradiation on corrosion performance of beryllium in BEPC II/BES III and CEPC beam pipe
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预辐照对BEPC II/BES III和CEPC束流管中铍腐蚀性能的影响
DOI：
10.1016/j.nima.2021.165700
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发表时间：
2021-08
期刊：
影响因子：
--
通讯作者：
Jingming Zhong
中科院分区：
文献类型：
--
作者：
Lifang Zheng;Chunwang Zhao;Baopeng Wu;Junzhong Huang;Xinyu Liu;Shuaiping Bao;Zhu Jiang;Jingming Zhong
铍是高能物理和核物理实验中最重要的材料之一。束流管是第二代北京正负电子对撞机（BEPC II）及其探测器北京谱仪III（BES III）的核心部件，束流管由铍材料制成，正负电子束流在束流管中发生碰撞，我国正在计划建造一台更高亮度的环形正负电子对撞机（CEPC），铍束流管将不可避免地被用到。高速粒子在碰撞中会产生大量的γ射线和中子对铍束管的辐照和热负荷。为了保证BES III的正常粒子探测，必须使用冷却剂带走多余的热量，以保持束管外壁的恒定温度。但研究表明，冷却剂会对铍产生一定的腐蚀，影响束管在辐照环境中的正常工作。因此，本文根据BEPC II/BES III的工作条件，采用EDM-1号电火花加工油对γ和中子预辐照后的铍样品进行冲刷，研究不同辐照方式和剂量对铍在EDM-1中腐蚀性能的影响。结果表明，预辐照促进了铍表面点蚀核和腐蚀孔洞的形成。γ预辐照对EDM-1中铍的腐蚀作用明显大于γ和中子预辐照，且腐蚀随辐照剂量的增加而增强。铍中的杂质元素对诱发点腐蚀、促进腐蚀孔的形成和扩展起着重要作用。EDM-1中的S2 −可能吸附在表面上，并进一步氧化为SO2和SO 42 −，它们可以掺入氧化物-金属界面并改变其组成。综上所述，辐照增强了EDM-1中铍的腐蚀。
Beryllium is one of the most important materials in high energy physics and nuclear physics experiments. Beam pipe, which lies at the centre of the second-generation Beijing Electron Positron Collider (BEPC II) and its detector Beijing Spectrometer III (BES III), is made of beryllium and the electron–positron beam collision occurs in it. China is planning to build a Circular Electron Positron Collider (CEPC) with higher brightness, in which the beryllium beam pipe will inevitably be used. High-speed particles will produce a lot of γ-rays and neutron irradiation and heat loads on the beryllium beam pipe in the collision. In order to ensure the normal particle detection of BES III, a coolant must be used to take away the excess heat to maintain the constant temperature of the outer wall of the beam pipe. Researches, however, have shown that the coolant can cause some corrosion of beryllium and affect the normal operation of the beam pipe in the irradiation environment. Therefore, this paper intends to study the influences of different irradiation types and doses on the corrosion performance of beryllium in EDM-1, by using No. 1 Electrical Discharge Machining Oil (EDM-1) to scour the beryllium sample after γ and neutron pre-irradiation, according to the working condition of BEPC II/BES III. It is found that pre-irradiation promotes the formation of pitting nuclei and corrosion holes on the beryllium surface. The corrosion effect of γ pre-irradiation on beryllium in EDM-1 is much more significant than that of γ and neutron pre-irradiation and the corrosion strengthens with the increase of irradiation dose. Impurity elements in beryllium play an important role in inducing pitting corrosion and promoting the formation and expansion of corrosion holes. S 2− in EDM-1 may adsorb on the surface and further be oxidized to SO 2 and SO 4 2−, which can be incorporated into the oxide–metal interface and change its composition. In conclusion, irradiation enhanced the corrosion of beryllium in EDM-1.
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影响因子：
8.3
作者：
J. S. Punni;M. Cox
通讯作者：
J. S. Punni;M. Cox
DOI：
10.1088/0953-8984/24/9/095004
发表时间：
2012-03
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
Pengbo Zhang;Jijun Zhao;B. Wen
通讯作者：
Pengbo Zhang;Jijun Zhao;B. Wen
影响因子：
5
作者：
H. Meng;Xinming Hu;A. Neville
通讯作者：
H. Meng;Xinming Hu;A. Neville
DOI：
10.1360/sspma2014-00152
发表时间：
2014-09
期刊：
--
影响因子：
--
作者：
He-Sheng Chen;Chuan Zhang;Wei-guo Li
通讯作者：
He-Sheng Chen;Chuan Zhang;Wei-guo Li
DOI：
10.1016/j.nima.2007.11.004
发表时间：
2008-01
影响因子：
1.4
作者：
Xunfeng Li;Q. Ji;L. Wang;Lifang Zheng
通讯作者：
Xunfeng Li;Q. Ji;L. Wang;Lifang Zheng