Title :
Axial free-electron laser interaction between an annular electron beam and an axisymmetric TM mode
Author :
Carlsten, Bruce E.
Author_Institution :
Los Alamos Nat. Lab., NM, USA
fDate :
10/1/1995 12:00:00 AM
Abstract :
Free-electron lasers (FEL´s) operating with helical wiggler fields and axial guide fields are subject to orbit instability which causes additional particle loss as saturation is reached, A new type of FEL interaction possible between an annular electron beam and a TM0m mode is described here. This interaction is between the axial electron motion and an RF mode that is radially “wiggled” a in periodically rippled waveguide. The net transverse force integrated over a wiggle period on each of the particles in this type of device can be made to vanish by choosing the proper waveguide radius. The resulting particle orbits are more stable than those in conventional FEL´s with helical wiggler fields
Keywords :
free electron lasers; laser modes; laser stability; laser theory; optical losses; optical saturation; undulator radiation; waveguide lasers; wigglers; FEL interaction; RF mode; annular electron beam; axial electron motion; axial free-electron laser interaction; axial guide fields; axisymmetric TM mode; helical wiggler fields; net transverse force; orbit instability; particle loss; particle orbits; periodically rippled waveguide; saturation; waveguide radius; wiggle period; Electron beams; Electron optics; Free electron lasers; Laser modes; Microwave devices; Optical waveguides; Radio frequency; Tellurium; Undulators; Waveguide components;
Journal_Title :
Quantum Electronics, IEEE Journal of
