Patent ID: 8963424
Filing Date: 2015-02-24
Classification: H01J

Abstract:
1. A coupler for a gyrotron, the coupler having: a cylindrical waveguide for helically propagating Whispering Gallery (WG) mode Radio Frequency (RF) energy, the cylindrical waveguide terminating in a launch edge; a first mode converting reflector adjacent to said launch edge and reflecting said WG mode RF energy from said launch edge into free space quasi-Gaussian mode RF energy having an elongate amplitude profile; a second mode converting reflector receiving said free space quasi-Gaussian mode RF energy and having a reflection surface which generates a circularly symmetric free space quasi-Gaussian mode RF energy distribution at a distance D from said second mode converting reflector; a corrugated waveguide located at said distance D from said second mode converting reflector and receiving said circularly symmetric free space quasi-Gaussian mode RF energy distribution for propagation in said corrugated waveguide in an HE11 mode.