Patent ID: 6690023
Filing Date: 2004-02-10
Classification: H01S,H05G,H05H

Abstract:
An electron device that includesan electron gun for producing a non-relativistic electron beam; and means for creating a uniform axial magnetic field B0 and a helical transverse magnetic field of wiggler Bw within a device interaction region wherein the axial and transverse magnetic fields are such that said electron beam moves along a helical trajectory with the transverse velocity v195 and the longitudinal velocity v81 satisfying the following relation v&UpTee;2&GreaterEqual;c2&it;(Î›wÎ›0-1),where v195, v81 are the transverse and longitudinal electron velocity, &Lgr;w is the spatial period of the transverse magnetic field, Î›0=v&RightDoubleBracketingBar;&it;2&it;Ï€&it;mceB0is the spatial period of the cyclotron revolution of the electron in the axial guide field, e and m are the charge and mass of the electron respectively, c is the speed of light in vacuum.