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Analysis and nonlinear simulation of a quadrupole wiggler FEL at millimeter wavelengths

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3 Author(s)
S. -F. Chang ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; O. C. Eldridge ; J. E. Scharer

The use of a helical quadrupole wiggler field in a circular guide for amplification of millimeter waves is discussed. The effects of space charge and axial field are considered for beam stability for near-axis orbits. When space charge is neglected, the orbit equations and properties and characteristic betatron oscillation of frequencies are examined by a linearization of the orbit equations. A nonlinear simulation code for dipole wigglers is modified to examine optimum gain TE21 waveguide modes for a quadrupole wiggler in the 30-300 GHz range

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IEEE Journal of Quantum Electronics  (Volume:24 ,  Issue: 11 )