In an inertial electrostatic confinement (IEC) nuclear fusion device extended to pulsed or a.c. operation for producing MeV neutrons or nuclear fusion energy, coupling of negative voltage to the deuteron or triton acceleration grid is effected in a non-conductive manner, preferably by capacitive or inductive coupling. Preferably, the entire current circuit between the outer casing of the device and the interior voltage grid is enclosed in cast insulation material, preferably 'Teflon' (RTM).
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