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. Author manuscript; available in PMC: 2021 Jan 1.
Published in final edited form as: IEEE Trans Electron Devices. 2019 Dec 10;67(1):328–334. doi: 10.1109/ted.2019.2953658

Fig. 7.

Fig. 7.

The measured (solid black line with dots) and calculated (dashed blue lines) start oscillation current of the operating mode TE11,2,q, q = 1,2,3,4 for different magnetic field values. A minimum start current of ~ 21 mA is observed. The calculated start current assumed cold cavity electric field profile in the linear theory for cavity radius of rc = 1.593 and operating voltage of V = 16.7 kV, α = 1.8 and Δv⊥ = 3% with the gun coil magnetic field of ~ −37 mT.