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In this paper, an impregnated barium acandate dispenser cathode primarily for applicationin microwave tubes, especially in gyrotrons, is investigated in the following aspecta: (1) pulse emission abilityand work function distribution; (2) electron initial velocity distribution in pulse operation; (3) the effect ofpulse duration ratio; (4) the anomalous Schottky effect under intensive electric field. Some useful results areobtained: the pulse current density is higher than 20 A/cm~2 (when T_k =850℃); the anomalous Schottkyeffect is observed when the field intenaity is higher than 10~4 V/cm; the cathode has flat J_-ft characteriaticwhen the pulse duration ratio is in the range of 5×10~(-3)--4×10~(-2) and an emission current density of 8.8A/cm~2 is drawn. Finally, the experimental results are discussed in relation to papers of the cathode surfaceanalysis published at home and abroad.
In this paper, an impregnated barium acandate dispenser cathode primarily for application in microwave tubes, especially in gyrotrons, is investigated in the following aspecta: (1) pulse emission ability and work function distribution; (2) electron initial velocity distribution in pulse operation; (3 ) the effect of pulse duration ratio; (4) the anomalous Schottky effect under intensive electric field. Some useful results areobtained: the pulse current density is higher than 20 A / cm ~ 2 (when T_k = 850 ° C); the anomalous Schottkyeffect is observed when the field intenaity is higher than 10~4 V / cm; the cathode has a flat J_-ft characteriatic wave duration of the pulse of 5 × 10 -3 -3 × 10 -2 Finally, the experimental results are discussed in relation to papers of the cathode surface analysis published at home and abroad.