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High power wideband gyrotron backward wave oscillator operating towards the terahertz region

He, Wenlong and Donaldson, Craig and Zhang, Liang and Ronald, Kevin and McElhinney, Paul and Cross, Adrian (2013) High power wideband gyrotron backward wave oscillator operating towards the terahertz region. Physical Review Letters, 110 (16). ISSN 0031-9007

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Experimental results are presented of the first successful gyrotron backward wave oscillator (gyro-BWO) in the low terahertz region. A helically corrugated interaction region (HCIR) was used to allow efficient interaction over a wide frequency band at the second harmonic of the electron cyclotron frequency without parasitic output. The gyro-BWO was measured to generate a maximum output power of 12 kW in a continuous frequency tuning band of 88-102.5 GHz when driven by a 40 kV, 1.5 A, annular-shaped large-orbit electron beam. The performance of the gyro-BWO is consistent with 3D particle-in-cell (PIC) numerical simulations.