It is well known that the rise of arc from the dense glow discharge is connected with the thermion and secondary processes on the cathode surface (Granovsky, 1971; Leob, 1953; Engel, 1935). First model of breakdown of the cathode layer is connected with the increase of the cathode temperature in consequence of the ion bombardment that leads to the grows its thermo-emissive current. Other model shows the main role of the secondary effects on the cathode surface-the increase of the secondary ion emission coefficient— γ i with the grows of glow discharge voltage. But the author of this investigation work of breakdown in Cs vapor (a transmission the glow discharge into self-maintaining arc discharge) discovered the next peculiarity: the value of breakdown voltage is constant when the values of vapor temperature (its pressure p cs ) and cathode temperature T k is constant too ( U b = constant with T k = constant and p cs = constant ) and it is not a statistical value (Onufryev, Grishin, 1996) (that was observed in gas glow discharges other authors (Granovsky, 1971; Leob, 1953; Engel, 1935)). The investigations of thermion high voltage high temperature diode (its breakdown characteristics in closed state and voltage-current characteristics in disclosed state) showed that the value of the breakdown voltage is depended on the vapor pressure in inter-electrode gap (IEG)- p cs and cathode temperature- T k and is independent on IEG length— Δ ieg . On this base it was settled that the main role in transition of glow discharge to self-maintaining arc discharge plays an ion cathode layer but more exactly—the region of excited atoms—“Aston glow.”


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    Titel :

    Experimental investigation of high temperature high voltage thermionic diode for the space power nuclear reactor


    Beteiligte:
    Onufriyev, Valery. V. (Autor:in) / El-Genk, Mohamed S. (Herausgeber:in) / Bragg, Mary J. (Herausgeber:in)

    Kongress:

    Space Technology and Applications International Forum - 2001 ; 2001 ; Albuquerque, New Mexico


    Erschienen in:

    AIP Conference Proceedings ; 552 , 1 ; 1136-1141


    Erscheinungsdatum :

    02.02.2001


    Format / Umfang :

    6 pages





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Experimental Investigation of High Temperature High Voltage Thermionic Diode for the Space Power Nuclear Reactor

    Onufriyev, V. V. / Institute for Space and Nuclear Power Studies | British Library Conference Proceedings | 2001


    Nuclear Reactor-Thermionic Space Power Systems

    Snyder, Nathan W. | AIAA | 1961


    Thermionic conversion and alloys for high-temperature nuclear space power

    Morris, J.F. / Jacobson, D.L. | Tema Archiv | 1988


    Thermionic nuclear reactor systems

    Kennel, E.B. | Tema Archiv | 1986


    Nuclear Safety Assurance for Space Thermionic Reactor with Positive Temperature Effect

    Ponomarev-Stepnoi, N. N. / Glushkov, Y. S. / Kompaniets, G. V. et al. | British Library Conference Proceedings | 1993