Measurement and Analysis of Electromagnetic Pulse from Laser-Target Interaction at ShenGuang II Laser Facility

Abstract

Electromagnetic pulses (EMPs) generated from lasers interacting with solid targets at the ShenGuang II laser facility were measured and analyzed in this work. The EMP radiations were related to the target geometries, where the strongest EMP signal with a magnitude of 10³ V and duration of several dozens of nanoseconds resulted from the monopole flat coil and Au foil targets. The EMPs detected inside the laser facility were seriously affected by the chamber wall, which could reflect EMPs and prolong the signals with several typical pulsed peaks. This study was expected not only to provide basic information to interpret physical processes caused by laser irradiating targets but also to offer a path for electromagnetic interference shielding designs and protect the diagnostics from damage in inertial confinement fusion.

Keywords:

• Electromagnetic pulses
• target geometries
• ShenGuang II laser facility

Acknowledgments

This work was financially supported by the Fundamental Research Funds for the Central Universities (ZYGX2015J108), and the National Natural Science Foundation of China (numbers 11575166 and 51581140) is also acknowledged.