A new method is proposed to enhance the efficiency of free-electron maser (EM). Aradial electrostatic field is introduced to assist the axial magnetic field to focus a large-orbitclectron beam. A new kind of azimuthal...A new method is proposed to enhance the efficiency of free-electron maser (EM). Aradial electrostatic field is introduced to assist the axial magnetic field to focus a large-orbitclectron beam. A new kind of azimuthal bunching mechanism. caused by the angular-momentum effect, is demonstrated. Nonlinear simulation of the interaction between a rela-tivistic electron beam and TE_(5,1,1) mode or TE_(10,1,1) mode shows that, as long as the initialparameters are properly chosen, the method is valid.展开更多
文摘A new method is proposed to enhance the efficiency of free-electron maser (EM). Aradial electrostatic field is introduced to assist the axial magnetic field to focus a large-orbitclectron beam. A new kind of azimuthal bunching mechanism. caused by the angular-momentum effect, is demonstrated. Nonlinear simulation of the interaction between a rela-tivistic electron beam and TE_(5,1,1) mode or TE_(10,1,1) mode shows that, as long as the initialparameters are properly chosen, the method is valid.
