【作者】 何佳龙； 杨振； 李杰； 龙继东； 刘尔祥； 石金水；

【Author】 HE Jia-Long;YANG Zhen;LI Jie;LONG Ji-Dong;LIU Er-Xiang;SHI Jin-Shui;Institute of fluid physics,China Academy of Engineering Physics;

【机构】 中国工程物理研究院流体物理研究所；

【摘要】 随着脉冲功率技术和粒子加速器技术的发展,粒子束辐照对绝缘介质材料真空沿面闪络性能的影响逐渐受到关注,而相关的研究工作尚未得到充分开展。氧化铝陶瓷作为最常用的管壁材料被广泛应用于开关管、中子管、速调管、行波管等电真空器件中,对这些器件的性能与可靠性起着非常关键的作用,开展离子束辐照影响氧化铝陶瓷真空沿面闪络性能的研究,可以更为全面地评估电真空器件管壁的耐高电压性能。为此,采用真空弧离子源产生的氘钛混和离子束,对离子束辐照影响氧化铝陶瓷真空沿面闪络性能进行了初步研究。边长20 mm厚度为2 mm质量分数99%的氧化铝陶瓷样品的一个表面被能量在40～100keV的脉冲离子束辐照处理,通过改变辐照次数使得样品接收到的离子辐照剂量在10¹³～10¹⁵离子/cm²,另外一个表面不做辐照处理。采用指状电极系统测试样品被辐照面和未被辐照面的闪络电压,电极间距为2 mm和4 mm。通过比较同一块样品被辐照面和未被辐照面的闪络电压,发现被离子束辐照后样品的闪络电压均出现了不同程度的下降。较低能量辐照下样品的闪络电压降幅较大,这可能和离子射程导致的表面缺陷分布差异有关,较低能量的离子束在表面产生了更多的辐照损伤;随着辐照剂量的增大,样品闪络电压降幅先增大后减小,先增大可能与辐照损伤的累积有关,后减小可能与离子注入引起的表面电阻率降低有关。更多还原

【Abstract】 The influence of particles irradiation on vacuum surface flashover characteristics of dielectrics becomes more and more important,which haven’ t been researched well,as the developing of pulse power technology and particle accelerator technology.Alumina ceramic which is the most commonly used dielectric as the tube wall material in vacuum electronic devices,playing a key role in the performance and reliability of these devices.In order to estimates the voltage withstands performance of tube wall,investigation on the vacuum surface flashover characteristics of alumina ceramic under ion irradiation should be taken comprehensively.Preliminary investigation on the influence of ion beam irradiation on vacuum surface flashover characteristics of alumina ceramic were taken by the hybrid ion beam generated by vacuum arc ion source.One sides of the alumina ceramic samples were irradiated with pulsed ion beam of the energy 40～100 keV,and ion dose were changed from 10¹³ to 10¹³ ions/cm².Samples’ flashover voltages were tested by finger like electrodes with 2 mm and 4 mm gaps.It was found that samples’ flashover voltage decreased after ion irradiation,lower ion energy got more decrement.It was assumed that ion range in the solid material will affect the flashover characteristic,short range produce more radiation damage on the surface.Flashover voltage decrement became large at first with the increase of irradiation dose.It was assumed that more radiation damage accumulated on the surface which reduced the flashover voltage.Flashover voltage decrement became small latter.It was assumed that more and more titanium accumulated on the surface which increased surface electrical conductivity,along with the increase of flashover voltage.更多还原