Effect of Switch Resistance on the Ringdown of a Slapper Detonator Fireset

摘要

An analysis is performed of the effect of a switch with time-dependent resistance on the ringdown characteristics of a slapper detonator fireset circuit. The latter is represented as a series LRC circuit. The analysis is performed by numerically solving the circuit equation to give the current as a function of time. Several different switch closure characteristics are considered in order to demonstrate their effect on the ringdown behaviour. The results show that ringdown amplitude is significantly affected, and oscillation frequency can be decreased. The magnitude of both effects depends on the switch resistance behaviour after closure. It is shown that significant errors can occur in the estimates of constant circuit inductance and resistance, if the switch resistance is not considered. The implications of improper switch design on slapper detonator functioning are discussed.