强电磁场真空击穿中的电子束轰击初步研究

发布时间：2018-05-24 11:26

本文选题：击穿 + 能量沉积　；参考：《中国空间科学技术》2017年02期

【摘要】：当前,抑制强电磁场真空击穿的方法主要是结构改进和工艺处理,对于提高材料耐电子轰击性能来抑制击穿的研究相对较少。文章主要结合Monte-Carlo方法和Bethe能量损失规律,研究了兆电子伏级能量的电子垂直入射金属靶材的能量损失规律。研究表明,材料原子序数和原子密度越小,电子在材料中的有效射程越长,单位体积内沉积的平均能量越低,从而越有利于材料耐受电子束轰击。在此基础上,通过试验比较了铜、不锈钢和钛三种材料耐电子束轰击的性能,在相同的电子束能量下,铜由于密度最高而最容易受到电子束轰击破坏,密度最低的钛材料具有最好的耐电子束轰击性能。进一步的高功率微波(High Power Microwave)试验证实,相对于不锈钢材料,在2.8GW输出微波功率水平下,使用耐电子轰击性能更优的钛材料能够将输出微波脉宽由18ns增加到27ns,由强电磁场真空击穿引起的脉冲缩短明显得到有效抑制。
[Abstract]:At present, the main methods to restrain the vacuum breakdown of the strong electromagnetic field are structure improvement and process treatment, but there are few studies on how to improve the resistance to electron bombardment of the materials to suppress the breakdown. Based on the Monte-Carlo method and the Bethe energy loss law, the energy loss law of the metal target with the electron vertical incidence of the metroelectronic volt energy is studied in this paper. The results show that the smaller the atomic number and density, the longer the effective range of electrons in the material, and the lower the average energy deposited in the unit volume, which is more favorable to resist electron beam bombardment. On this basis, the properties of copper, stainless steel and titanium against electron beam bombardment are compared by experiments. Under the same electron beam energy, copper is most vulnerable to electron beam bombardment because of its highest density. Titanium with the lowest density has the best resistance to electron beam bombardment. Further high power microwave Power microwavetest confirmed that compared with stainless steel material, at the microwave power level of 2.8GW output, The pulse width of the output microwave can be increased from 18ns to 27ns by using titanium materials with better resistance to electron bombardment, and the pulse shortening caused by the vacuum breakdown of the strong electromagnetic field can be effectively suppressed.
【作者单位】：湘潭大学材料科学与工程学院;西北核技术研究所;高功率微波技术重点实验室;
【基金】：国家自然科学基金(61401367) 西北核技术研究所预研项目(13061601)
【分类号】：TN125

【相似文献】