摘要
新一代粒子加速器向着高能量和高亮度方向发展,而储存环中的电子云效应极大地阻碍了粒子束的稳定性,是限制加速器进一步发展的主要制约因素。因此,对于新一代的高能粒子加速器来说,寻找低二次电子发射系数(SEY)的储存环真空室表面材料是至关重要的。研究发现,储存环真空室表面沉积无定形碳薄膜是一种很有潜力的加速器真空室表面处理方法。采用直流磁控溅射的方法,在管道表面沉积了高质量的无定形碳薄膜,并对二次电子发射特性进行了研究,发现在入射电子密度为1×10^(-8)C/mm^(-2)的条件下,薄膜的SEY为1. 132,说明无定形碳薄膜可以很好地降低二次电子发射,从而抑制电子云效应。
We addressed the electron cloud problem in modem high-energy and high-luminosity particle accel- erators.The amorphous carbon(a-C)coatings,with low secondary electron yield(SEY)in ultra-high vacuum,were deposited by DC magnetron sputtering on the stainless steel substrate installed on the inner wall of a pipe(φ86mm×1000mm)to be used as the storage ring in the particle accelerator.The influence of the microstructures of the a- C coatings and dose of electron beam on SEY was investigated with scanning electron microscopy and X-ray photoelectron spectroscopy.The results show that normally impacted by an e-beam at a dose of 1×10^-8 C/mm^-2,SEY of the highly pure and fairly rough a-C coatings with strong interracial adhesion was estimated to be 1.132.We suggest that a-C film may be a promising surface modification material to suppress electron cloud and to enhance the particle beam stability.
作者
张宇心
王一刚
葛晓琴
张波
尉伟
裴香涛
范乐
王勇
Zhang Yuxin;Wang Yigang;Ge Xiaoqin;Zhang Bo;Wei Wei;Pei Xiangtao;Fan Le;Wang Yong(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China)
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2018年第12期1065-1069,共5页
Chinese Journal of Vacuum Science and Technology
基金
国家自然科学基金项目(11475166).
关键词
粒子加速器
二次电子产额
无定形碳薄膜
直流磁控溅射
Particle accelerator
Secondary electron yield
Amorphous carbon thin film
DC magnetron sputtering