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Conclusions
The C shaped arcs indicate that the magnetic flux tube is NOT at an equipotential. The brightness suggested ~1kV or so potential drop.
The X-rays brightness also indicate additional electron acceleration, not seen in a pure negative glow discharge.
The spinning magnet appears to have changed the electron energies by about ~1keV, randomly
These observations are consistent with our theoretical analysis, but show a surprising modulation with neutral pressures.
Notes: