Fast damaging processes in the TaN thin film absorbers under action of nanosecond electrical pulses

Abstract

Purpose

The purpose of this paper is to investigate damaging processes in TaN thin film absorbers under action of high-voltage electrical pulse of nanosecond duration. Despite having mechanical origin of crack opening, estimation based on the readings from oscillograms shows uncharacteristically high velocities of the crack propagation.

Design/methodology/approach

Microscopic images of damaged absorbers showing the final result of the damaging process provided initial information about its geometrical peculiarities. Then, to clarify the dynamics of the process, the authors create the model of the crack, having elements of self-similarities and multiple stage opening. The influence of heating induced by current concentration at crack tip and of magnetic stress of this concentrated current are both included in the model.

Findings

Using physical parameters of TaN layers with flowing current and performing calculations the authors define the conditions required to initiate the damaging process and to sustain it. Danger of such damage is relevant for high-T_c superconducting thin films after their switching to normal state which is induced by the high-voltage pulse.

Practical implications

There were made recommendations to manufactures aiming to improve electrical durability of the absorbers in an effort to prevent the damaging influence of power nanosecond electrical pulses.

Originality/value

Three stage opening model implies the appearance of zone of high-energy dissipation that can lead to detonation-like destruction of the film and, therefore, explain the high velocities of crack propagation.

Citation

Ardaravičius, L., Keršulis, S., Kiprijanovič, O., Šimkevicius, Č. and Vengalis, B. (2016), "Fast damaging processes in the TaN thin film absorbers under action of nanosecond electrical pulses", International Journal of Structural Integrity, Vol. 7 No. 5, pp. 607-616. https://doi.org/10.1108/IJSI-09-2015-0031