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| AN INVESTIGATION ON PULSE PROPERTIES OF IMPREGNATED BARIUM SCANDATE DISPENSER CATHODES |
| Yang Lingyun; Wang Shusheng |
| Institute of Electronics Academia Sinica |
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Abstract The impregnated barium scandate dispenser cathode used in microwave tulbes, especially in gyrotrons, has been investigated in following aspects: (1) pulse emission property and work function distribution; (2) electron initial velocity distribution in pulse operation; (3) the effect of pulse duration ratio; (4) anomalous Schottky effect under high electric field. Some useful results are obtained: the pulse emission current density is higher than 20 A/cm2 (when t=850℃) ; the anomalous Schottky effect is observed when the electric field is higher than 104V/cm; the cathode has a flat Ja-fτ property when the pulse duration ratio is in the range of 5×10-3--4×10-2 and an emission current density of 8.8A/cm2 is drawn. In the end, the obtained results are discussed in relation to the surface analysis of the cathode.
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Received: 01 January 1900
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1986, Vol. 8 
