Title :
The influencing of the surface structure on the emission properties of the Sc-Ba dispensed cathodes
Author :
Bekh, L.I. ; Il´chenko, V.V. ; Lushkin, A.E.
Author_Institution :
Dept. of Radiophys., Taras Shevchenko Kiev Univ., Ukraine
Abstract :
The researches were carried out in UHV chamber and the pressure of residual gases did not exceed 5·10-9 torr. The structure of the cathodes surface was investigated by the Auger electron spectroscopy (AES). The measurement of emission properties of cathodes was made in a flat diode system in a pulse mode. The anode was the molybdenum plate (2×2×0.2 mm.), which was heating to the high temperature by the electron impact. Spacing interval the cathode-anode was equal to 1 mm and has been carefully controlled. Pulse duration of the anodic voltage is 4 μs. The amplitude of anodic voltage can change up to 5 kV. A work function of the samples was calculated by the method of a full current.
Keywords :
Auger electron spectroscopy; anodes; barium; electron emission; scandium; thermionic cathodes; thermionic emission; work function; Auger electron spectroscopy; Sc-Ba; UHV chamber; cathodes surface; dispensed cathodes; electron impact; emission properties; flat diode system; molybdenum plate; pulse mode; surface structure; work function; Anodes; Cathodes; Diodes; Electrons; Gases; Heating; Pulse measurements; Spectroscopy; Surface structures; Voltage;
Conference_Titel :
Vacuum Electron Sources Conference, 2004. Proceedings. IVESC 2004. The 5th International
Print_ISBN :
0-7803-8437-7
DOI :
10.1109/IVESC.2004.1414192
