Title :
1.2THz backward wave radiation generated by double bunched sheet beams
Author :
Liu, G. ; Wang, J.X. ; Shu, G.X. ; Yang, L.Y. ; Luo, Y.
Author_Institution :
Sch. of Phys. Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
Coherent terahertz radiation obtained from double bunched sheet electron beams over a surface evanescent wave provides an effective method to extend the operating frequency and power capacity. An overmoded ridge-loaded grating waveguide was introduced in our double sheet beam backward wave oscillator (BWO) design. The fundamental mode TM11 was updated to the TM21++ mode, which is compact to integrate with the multi-beam concept. Pierce small signal theory (PSST) was used to predict the growth rate and start current. Particle-in-cell (PIC) analysis showed the BWO can radiate 21.1dBm (150mW) pulse output power at 1.209THz with the beam parameters of 20kV and total current 5mA.
Keywords :
backward wave oscillators; electron beams; terahertz wave generation; BWO; backward wave oscillator; backward wave radiation; coherent terahertz radiation; current 5 mA; double bunched sheet beams; double bunched sheet electron beams; evanescent wave; frequency 1.2 THz; particle-in-cell analysis; pierce small signal theory; power 150 mW; power capacity; ridge-loaded grating waveguide; voltage 20 kV; Electromagnetic waveguides; Gratings; Oscillators; Particle beams; Plasmas; Power amplifiers; Power generation; Pierce small signal theory; backward wave radiation; double sheet beam;
Conference_Titel :
Vacuum Electronics Conference (IVEC), 2015 IEEE International
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7109-1
DOI :
10.1109/IVEC.2015.7223892
