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Using fast-rising voltage pulses, corona discharges are created on the helix. Investigations are carried out in atmospheric air and SF6/argon mixture. The corona discharges produce electron beams on the helix. High-power microwaves are obtained in the structure that has two microwave sources. The helix as the slow-wave structure with in situ generated electron beams is one source of microwave generation. The experimental data are presented. The analysis of the data related to the helix is based on the backward-wave oscillator.