A waveguide-type plasmatron based on a waveguide-to-coaxial adapter (WCA) has been developed. Nitrogen is used as a plasma-forming medium. The microwave discharge initiator based on a disordered stacking of tungsten spirals placed on the end wall of the inner conductor of the coaxial line of WCA has been designed and experimentally tested. A sustained plasma torch is obtained at the atmospheric pressure and a microwave generator power of 1.5 kW. The designed plasmatron is oriented to application in plants for utilizing associated petroleum gas and producing a methane-hydrogen mixture and a carbon nanomaterial.
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