A laser-triggered spark gap model
A laser-triggered spark gap model
复制标题
激光触发火花隙模型
DOI：
10.1063/1.335848
复制
发表时间：
1985
影响因子：
3.2
通讯作者：
W. Kimura
中科院分区：
文献类型：
--
作者：
M. Kushner;R. Milroy;W. Kimura
激光预电离是一种可以减少火花隙形成滞后时间和抖动的方法，并且可以在显著低于自击穿值的电压下开始击穿。在所关注的火花间隙(100-ns火花持续时间)中，等离子体柱从初始激光预电离直径约50μm扩展到直径超过1 mm的弧形，并传导大于12 kA的峰值电流。由于等离子体的阻性崩溃所需的时间与火花持续时间相当，因此火花间隙在电路中代表着不可忽略的阻性损耗。这项研究的目的是了解激光触发火花隙形成的基本机制，并为优化其设计和最小化其电阻损失提供依据。为了研究激光触发火花隙的扩展和传导阶段，建立了一个第一性原理模型。该模型包括气体动力学、电子碰撞动力学、辐射输运和外电路。
Laser preionization is a method whereby the formative lag time and jitter of spark gaps can be reduced, and breakdown can be initiated at voltages significantly below the self‐breakdown value. In the spark gaps of interest (100‐ns spark duration), the plasma column expands from an initial laser preionized diameter of approximately 50 μm to an arc of diameter in excess of 1 mm, and conducts greater than 12‐kA peak current. Since the time required for the resistive collapse of the plasma is comparable to the spark duration, the spark gap represents a non‐negligible resistive loss in the circuit. The objective of this study is to understand the basic mechanisms by which laser‐triggered spark gaps develop and to provide a basis to optimize their design and minimize their resistive losses. To study the expansion and conduction phases of laser‐triggered spark gaps, a first principles model has been developed. This model includes gas dynamics, electron collision kinetics, radiation transport, and external circui...