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Pulsed cathode heating method

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3 Author(s)
Lipscomb, G.A. ; Dept. of Electr. Eng. & Comput. Sci., Michigan Univ., Ann Arbor, MI, USA ; Herniter, Marc E. ; Getty, Ward D.

A pulsed-mode heating method has been developed and tested for a 1-in.-diameter cathode which reduces the average filament power by over an order of magnitude. The method allows cyclic operation with a few seconds of peak cathode temperature, which allows many microsecond-duration electron pulses to be fired at the peak cathode temperature in each cycle. For a 2-in.-diameter 0.125-in.-thick LaB6 cathode, the saving is just as great. A 1.68-mF capacitor at 6 kV can cycle the larger cathode from 494° to 1800°C and back in 120 s. The energy requirement is 30.2 kJ, which is an average power of 252 W. This is still a saving of over an order of magnitude from the case of steady heating. The same cathode thickness as in the 1-in. case is assumed in this prediction

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Plasma Science, IEEE Transactions on  (Volume:17 ,  Issue: 6 )