title: High power wideband gyrotron backward wave oscillator operating towards the terahertz region.
abstract: Experimental results are presented of the first successful gyrotron backward wave oscillator (gyro-BWO) with continuous frequency tuning near the low-terahertz region. A helically corrugated interaction region 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 generated a maximum output power of 12 kW when driven by a 40 kV, 1.5 A, annular-shaped large-orbit electron beam and achieved a frequency tuning band of 88-102.5 GHz by adjusting the cavity magnetic field. The performance of the gyro-BWO is consistent with 3D particle-in-cell numerical simulations.
authors.affiliation: Department of Physics, SUPA, University of Strathclyde, Glasgow, G4 0NG, United Kingdom.
authors.forename: W
authors.initials: W
authors.lastname: He
authors.forename: C R
authors.initials: CR
authors.lastname: Donaldson
authors.forename: L
authors.initials: L
authors.lastname: Zhang
authors.forename: K
authors.initials: K
authors.lastname: Ronald
authors.forename: P
authors.initials: P
authors.lastname: McElhinney
authors.forename: A W
authors.initials: AW
authors.lastname: Cross