High Current Planar Beam in a Wiggler Magnet Array

Transport of high current (~kilo-ampere range with particle energy ~1 MeV) planar electron beams is a topic of increasing interest for applications to high power (1-10 GW), and high frequency (10-20 GHz) microwave devices like backward wave oscillator (BWO), klystrons, gyrotrons etc. Simulated results are obtained for transport of electron beams with velocitv V_b = 5.23times10⁸ cm/sec and relativistic factor gamma =1.8, and beam voltage ~280 kV in notched wiggler magnet array. The calculation includes self-consistent effects of beam generated fields. Our results show that the notched wiggler configuration with magnetic field strength ~6.97 kG can provide vertical and horizontal confinement for a sheet electron beam with thickness 0.3 cm, width 2.0 cm. The feasibility calculation addresses to a system expected to drive for 13-20 GHz BWO with rippled waveguide parameters as, width b=3.0 cm, thickness a=1.0 cm, corrugation depth h=0.225 cm, and spatial periodicity d=1.67 cm.