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In this work, a novel measurement system for the analysis of the gyrotron RF output spectrum was developed. It enables unprecedented time dependent measurements within a large bandwidth, dynamic range and unambiguous RF indication in the entire D-Band (110-170 GHz). Special attention was given to the investigation of parasitic RF oscillations, and the analysis of the interplay of thermal cavity expansion and ionization-based space charge neutralization at the start of long RF pulses.

spectrum analysis --- Mikrowellenmesstechnik --- millimeter waves --- Gyrotron --- Spektralanalyse --- Millimeterwellen --- microwave measurement techniques