One part of this setup : First photo. Top coil and cage are attached from my tip31 npn Slayer exciters topload : RF flows from the outer to the inner electrodes through helium gas in vacuum . This starts a current to heat the gas and creates an intense field. Guided by its own magnetic field this forms into thin tiny filaments little whirlwinds of hot electrically conducting gases.
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6 linear plasma column in a magnetic field
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From @slowpath