Theoretical investigation of a high efficiency and broadband subterahertz gyrotron

Nai-Ching Chen; Tsun-Hsu Chang; Ching-Pin Yuan; Idehara, Toshitaka; Ogawa, Isamu
April 2010
Applied Physics Letters;4/19/2010, Vol. 96 Issue 16, p161501
Academic Journal
This study investigates the electron dynamics of gyrotron interaction in a tapered waveguide and proposes an interaction structure for a 0.2 THz TE02 reflective gyrotron backward-wave oscillator (gyro-BWO). The design shows the advantages of high power, continuous, and broadband frequency tuning, mode converter free, and inherently possesses mode-selective ability to suppress the potentially competing TE22 mode. Calculated results indicate that the reflective TE02 gyro-BWO is capable of generating a peak power of 3.3 kW corresponding to 26.3% interacting efficiency with a broad 3dB tuning bandwidth of 6.9 GHz at beam current Ib=0.5 A and beam voltage Vb=25 kV.


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