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A novel plasma cathode has been demonstrated. Its operation depends on the presence of a magnetic field and requires a low‐pressure burst of gas to form a crossed‐field discharge. The electron current that can be extracted is controlled by the discharge current. When the extracted current is less than the space‐charge limit there is no diode closure. The fundamental characteristics of intense crossed‐field discharges are measured, and cathode tests up to 6 A cm-2 at 100 kV are reported, in a 100‐cm2 cathode with 5‐μs pulses.