A mode-selective circuit for TE01 gyrotron backward-wave oscillator with wide-tuning range

Chen, N. C.; Yu, C. F.; Yuan, C. P.; Chang, T. H.
March 2009
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
Academic Journal
This study proposes a mode-selective circuit to suppress the competing modes in a TE01 gyrotron backward-wave oscillator (gyro-BWO). The circuit, also functioning as an interaction structure, comprises of several transverse slices. It eliminates the restrictions of the mode competitions and allows a longer interaction structure to optimize interacting efficiency. Mode-selective effect will be analyzed. Experimental results indicate that the Ka-band TE01 fundamental harmonic gyro-BWO is capable of continuous tuning from 31.4 to 36.4 GHz with a peak efficiency of 23.7%, corresponding to 100 kW at Ib=4.5 A and Vb=93.6 kV.


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