Explosion symmetry improvement of polyimide-coated tungsten wire in vacuum on negative discharge facility
Explosion symmetry improvement of polyimide-coated tungsten wire in vacuum on negative discharge facility
复制标题
负放电装置真空中聚酰亚胺涂层钨丝爆炸对称性的改进
DOI：
10.1063/1.5007210
复制
发表时间：
2018
影响因子：
2.2
通讯作者：
Qiu Mengtong
中科院分区：
文献类型：
--
作者：
Li Mo;Wu Jian;Lu Yihan;Li Xingwen;Li Yang;Qiu Mengtong
当高电流率和绝缘涂层都应用于使用24 mm直径阴极几何形状的负放电设施时，钨丝爆炸是非常不对称的，这通常用于兆安培设施。据推断，基于对引导中心漂移和COMSOL模拟的分析处理，大的负径向电场导致早期电压击穿，并终止能量沉积到导线的阳极侧的线芯中。在阳极侧短路之后，沿阴极侧上的线表面的径向电场沿着将改变其极性，并且因此导致额外的能量沉积到线芯中。这种变化导致阴极侧的能量沉积比阳极侧大10倍，爆炸速度比阳极侧快14倍。为了减少这种不对称性，空心圆柱形阴极的几何形状被用来扭转径向电场的极性，并进行了优化，用于多MA设施。在这种情况下...
Tungsten wire explosion is very asymmetric when fast current rate and insulated coatings are both applied on negative discharge facility using a 24-mm-diameter cathode geometry, which is commonly used on mega-ampere facilities. It is inferred, based on an analytical treatment of the guiding center drift and COMSOL simulations, that the large negative radial electric field causes early voltage breakdown and terminates energy deposition into the wire core on the anode side of the wire. After the anode side is short circuited, the radial electric field along the wire surface on the cathode side will change its polarity and thus leading to additional energy deposition into the wire core. This change causes ∼10 times larger energy deposition and ∼14 times faster explosion velocity in the cathode side than the anode side. In order to reduce this asymmetry, a hollow cylindrical cathode geometry was used to reverse the polarity of radial electric field and was optimized to use on multi-MA facilities. In this case...