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

Journal Article · Tue Nov 01 04:00:00 EST 1988 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/3.8575· OSTI ID:6403931

Chang, S F; Eldridge, O C; Scharer, J E ^[1]

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1. Dept. of Electrical and Computer Engineering, Univ. of Wisconsin, Madison, WI (US)

The authors examine the use of a helical quadrupole wiggler field in a circular guide for amplification of millimeter wavelength waves. The effects of space charge and axial guide field are considered for beam stability for near-axis orbits. When space charge is neglected, the authors examine the orbit equations and properties and characteristic betatron oscillation frequencies by linearization of the orbit equations. A non-linear simulation code developed by NRL for dipole wigglers is modified to examine optimum gain TE/sub 21/ waveguide modes for a quadrupole wiggler in the 30-300 GHz range. Particle orbit trajectories well off-axis for an annular beam are examined, as well as nonlinear gain, efficiency at saturation, and characteristic betatron oscillations, illustrating classic quadrupole focusing effects for an untapered wiggler. Finally, the quadrupole wiggler is compared to an equivalent dipole wiggler case to illustrate the advantages and drawbacks of each case.

• OSTI ID: 6403931
• Journal Information: IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. 24:11; ISSN IEJQA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
BEAM DYNAMICS
BEAM FOCUSING MAGNETS
COMPUTER CODES
COMPUTERIZED SIMULATION
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC FIELDS
ELECTROMAGNETS
EQUIPMENT
FREQUENCY RANGE
GAIN
GHZ RANGE
GHZ RANGE 01-100
GHZ RANGE 100-1000
LASERS
MAGNETS
NONLINEAR PROBLEMS
ORBIT STABILITY
OSCILLATIONS
SIMULATION
STABILITY
TRAJECTORIES
WAVEGUIDES
WAVELENGTHS
WIGGLER MAGNETS