SYMPOSIA PAPER Published: 01 January 1961
STP41242S

Mass Spectrometric Studies of Power Klystron Exhaust Processing

Source

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.
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Details
Developed by Committee: F01
Pages: 210–216
DOI: 10.1520/STP41242S
ISBN-EB: 978-0-8031-5963-1
ISBN-13: 978-0-8031-6117-7