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    Mass Spectrometric Studies of Power Klystron Exhaust Processing

    Published: 01 January 1961

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    The partial pressures of the residual gases present during vacuum processing and operation of power klystrons were measured using a bakeable Diatron-20 mass analyzer tube. The gases present during bakeout at 500 C were, in decreasing abundance, hydrogen, water, carbon monoxide, carbon dioxide, and methane. Carbon dioxide, methane, and carbon monoxide predominated during the conversion of both oxide and nickel-matrix cathodes. Carbon monoxide was evolved when the tube body was bombarded by the electron beam. After seal-off, the residual gas pressure in the klystron was about 5 x 10-7 Torr, consisting of carbon monoxide, methane, and hydrogen. One hundred hours of operation reduced the pressure to 4 x 10-9 Torr. The remaining gases were carbon monoxide and hydrogen.

    Author Information:

    Noble, Lowell
    Eitel-McCulloueh, Inc., San Bruno, Calif.

    Waits, Robert K.
    Eitel-McCulloueh, Inc., San Bruno, Calif.

    Committee/Subcommittee: F01.12

    DOI: 10.1520/STP41242S