Probe Measurements on Parametric Decay and Density Threshold in a Linear Microwave Discharge

Influence of broadened pump wave spectra on the stochastic heating in an ECR mirror machine

“…The magnetic-field configuration has no direct influence on the plasma-wave interaction, however. Probe measurements at microwave powers well below the power threshold reveal an increased plasma density in the I 2 = 501 A configuration [3]. That means that in this special configuration the plasma containment is improved.…”

“…Experiments in an ECR-heated magnetic mirror prove the possibility of a spectral broadening of the given monochromatic pump wave as well as the simultaneous existence of electrostatic waves with low and high frequencies [3]. Since the electron cyclotron frequency is close to the frequencies of electrostatic eigenmodes of the plasma, this noise results from a collective behavior of the plasma, namely parametric instabilities.…”