Planar electron beams in a wiggler magnet array

Abstract

Transport of high current (∼kA range with particle energy ∼1 MeV) planar electron beams is a topic of increasing interest for applications in high-power (1–10 GW) and high-frequency (10–20 GHz) microwave devices such as backward wave oscillator (BWO), klystrons, gyro-BWOs, etc. In this paper, we give a simulated result for transport of electron beams with velocity \(V_{\rm b} = 5.23 \times 10^{8}\) cm s − 1, relativistic factor γ = 1.16, and beam voltage = ∼80 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 ∼6.97 kG magnetic field strength can provide vertical and horizontal confinements for a sheet electron beam with 0.3 cm thickness and 2 cm width. The feasibility calculation addresses to a system expected to drive for 13–20 GHz BWO with rippled waveguide parameters as width w = 3.0 cm, thickness t = 1.0 cm, corrugation depth h = 0.225 cm, and spatial periodicity d = 1.67 cm.