Relativistic electron-beam current densities as high as 2.7 MA/cm 2 and power fluxes of 1.87 TW/cm 2 have been generated and diagnosed on a pulsed electron-beam accelerator. The beam was field emitted from a 2-mm-diam glass cathode toward a transmission anode. Current densities were inferred by passing the beam through apertures as small as 1 mm and measuring the transmitted current with a Faraday cup.
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