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An active anode plasma source has been developed for use in a magnetically insulated ion diode operated on a 1010‐W pulsed power generator. This source uses an inductive voltage from a single turn coil to beak down an annular gas puff produced by a supersonic nozzle. The resulting plasma is magnetically driven toward the radial insulating magnetic field in the diode accelerating gap and stagnates at a well‐defined surface after about 300 ns to form a plasma anode layer defined by magnetic flux surfaces. An ion beam is then extracted from this plasma layer by applying a 150‐kV, 1‐μs pulse to the accelerating gap. Optimization of the timing of the gas puff, the plasma production discharge, and the high voltage pulse has resulted in 1‐μs duration 75–150‐keV ion beam pulses with ≫100‐A/cm2 peak ion current density over an area of about 400 cm2. Up to 5 J/cm2 has been collected by a 4‐cm2 calorimeter. The diode impedance history can be varied so that rising, flat, and falling voltage pulse waveforms can be produced. Streak photographs of beamlets impinging on a scintillator and time integrated targets both show beam divergence angles ≤3°. However, under certain operating conditions, large excursions (∼25°) in mean aiming angle on time scales of 20–200 ns are observed.