Free electron laser with longitudinal wiggler and finite magnetic field in a partially filled waveguide

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.871769· OSTI ID:434556

Mehdian, H ^[1]; Willett, J E ^[2]; Maraghechi, B ^[3]; Aktas, Y ^[4]

---

1. Department of Physics, Teacher Training University, Tehran (Iran)
2. Department of Physics and Astronomy, University of Missouri---Columbia, Columbia, Missouri 65211 (United States)
3. The Center for Theoretical Physics and Mathematics, Atomic Energy Organization of Iran, Tehran (Iran)
4. Department of Physics, University of North Carolina at Charlotte, Charlotte, North Carolina 28223 (United States)

The operative mechanism for a free electron laser with a longitudinal electrostatic wiggler is analyzed. A theory is developed that allows for an arbitrary axial magnetic guide field and arbitrary ratio of the electron beam radius {ital a} to the waveguide inner radius {ital R}. Dispersion equations for the eigenmodes of a waveguide containing a magnetized electron beam and a formula for the spatial growth rate of parametrically excited eigenmodes are derived. The growth rate, efficiency, radiation wavelength, and required pump wavelength are studied numerically as functions of the ratio {ital a}/{ital R}. It is shown that excitation of the upper branch or lower branch of an electric{endash}magnetic (EH) waveguide mode can be achieved with suitably chosen values for the system parameters. {copyright} {ital 1996 American Institute of Physics.}

• OSTI ID: 434556
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 3; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
DISPERSION RELATIONS
EIGENSTATES
ELECTRON BEAMS
FREE ELECTRON LASERS
INSTABILITY GROWTH RATES
PARAMETRIC INSTABILITIES
WAVEGUIDES
WIGGLER MAGNETS