Generation of electromagnetic radiation from a rotating electron ring in a rippled magnetic field

Journal Article · Mon Apr 01 04:00:00 EST 1985 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.864993· OSTI ID:6007499

Yin, Y Z; Bekefi, G

Calculations show that modes resembling the free-electron laser (FEL) instability are excited when electrons move in quasicircular orbits under the combined action of a uniform axial magnetic field and an azimuthally periodic wiggler magnetic field. In the model, a thin annular ring of rotating electrons is confined in a hollow cylindrical waveguide, or between concentric cylinders comprising a coaxial waveguide, and the dispersion equations for the transverse magnetic (TM/sub l/m ) modes are derived and analyzed. Coherent radiation occurs near frequencies ..omega.. corresponding to the crossing points of the electromagnetic modes ..omega.. = ..omega../sub c/(l,m) and the beam modes ..omega.. = (l+N)..cap omega../sub parallel/, where ..omega../sub c/ and ..cap omega../sub parallel/ are the waveguide cutoff frequency and the electron cyclotron frequency, respectively, and N is the number of wiggler periods.

• Research Organization: Department of Physics and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
• DOE Contract Number: FG05-84ER13272
• OSTI ID: 6007499
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 28:4; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
ANALYTICAL SOLUTION
ANNULAR SPACE
BEAM DYNAMICS
COHERENT RADIATION
COMPUTERS
CONFIGURATION
CYCLOTRON FREQUENCY
CYLINDERS
DISPERSION RELATIONS
ELECTRICAL EQUIPMENT
ELECTROMAGNETIC RADIATION
ELECTROMAGNETS
ELECTRON RINGS
ENERGY RANGE
EQUIPMENT
INSTABILITY
MAGNETIC FIELDS
MAGNETS
MICROWAVE RADIATION
MOTION
RADIATIONS
RELATIVISTIC RANGE
ROTATION
SPACE
WAVEGUIDES
WIGGLER MAGNETS