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Characteristics of a Plasma Anode Based on Hybrid Discharge for the Use in a High-Current Electron Gun

The paper presents the results of study of the radial distribution of charge particle density in a plasma anode of a high-current electron gun. An axial-symmetric plasma anode was formed by a hybrid discharge combining high-current reflective (Penning) discharge with vacuum arcs. Radial distributions of the ion density were measured with the use of four double probes. The obtained distributions confirmed expected increasing (by 2–3 times) of the ion density at the periphery of plasma anode in comparison with its central part. Finally, this allows one to improve the uniformity of high-current electron beam formed in the gun.