Spectroscopy of Air Discharge Plasmas Induced by a Gyrotron Beam

This comprehensive study explores the practicalities of beamed energy propulsion (BEP) systems, focusing on the spectroscopic measurements of air discharge plasmas within a microwave rocket’s nozzle. It unpacks the mechanism by which millimeter-wave energy is transformed into thrust via plasma generation and millimeter-wave supported detonation. Special attention is given to the non-equilibrium dynamics of neutral particles and ions in atmospheric millimeter-wave discharges. A practical method to investigate these dynamics is introduced through optical emission spectroscopy (OES), a nonintrusive technique capable of studying plasma without disturbing it. The study features real-world examples, adding practical value and feasibility to the theoretical aspects. This exploration substantiates BEP’s potential in revolutionizing space transportation, bringing substantial cost reduction and high efficiency.