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. Author manuscript; available in PMC: 2010 Jan 5.
Published in final edited form as: IEEE Trans Electron Devices. 2009 May 1;56(5):818–827. doi: 10.1109/TED.2009.2015802

Fig. 4.

Fig. 4

Calculated BWO oscillation start current thresholds versus circuit length under the conditions shown for various mirror apertures a. The dot indicates that a 2-A beam current limits the circuit length to about 7.5 cm or less at 30 kV.