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Planar field emission cathode based on nanoscale carbon structure: Progress level and development trends

The results of practical testing of previously proposed by the authors of the concept of constructing planar field emission structures based on the use of nanoscale diamond-like carbon film are presented. The complex of electrophysical and operational parameters of developed and manufactured multi-electrode cathode-grid assemblies is investigated — current-voltage characteristics; the level of average density of field-emission current JS, acceptable for long-term and stable operation of the unit for 1–8 thousand hours; the level of working potentials; the efficiency of the electron beam transport to the anode (93–99 %). We analyze ways to improve JS to 0.5 A⋅cm−2 without compromising the durability.