Ion gyro-harmonic structuring in the stimulated radiation spectrum during third electron gyro-harmonic heating

Abstract

Recently, there has been significant interest in ion gyro-harmonic structuring the Stimulated Electromagnetic Emission SEE spectrum due to the potential for new diagnostic information available about the heated volume and ancillary processes such as creation of artificial ionization layers. These relatively recently discovered emission lines have almost exclusively been studied for second electron gyro-harmonic heating. The first extensive systematic investigations of the possibility of these spectral features for third electron gyro-harmonic heating are provided here. Objectives include the consideration of the variation of the spectral behavior under pump power, proximity to the gyro-harmonic frequency, and beam angle. Also, the relationship between such spectral features and electron acceleration and creation of plasma irregularities was an important focus.