Rh. Jackson et al., DESIGN OF A FAR-INFRARED CHI WIGGLER FREE-ELECTRON LASER, Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment, 375(1-3), 1996, pp. 226-229
The preliminary design of a voltage tunable far-infrared foe-electron
laser with a Coaxial Hybrid Iron (CHI) wiggler is presented. The CHI w
iggler consists of a central rod and an outer ring of alternating ferr
omagnetic and non-ferromagnetic spacers. A period wiggler field is pro
duced when the CHI structure is immersed in an axial magnetic field. T
he design under investigation makes use of a 1 MV/1A annular electron
beam interacting with the TE(01) coaxial waveguide mode at approximate
ly 1 THz (lambda = 300 mu m). The nominal wiggler period is 0.5 cm and
the inner and outer waveguide radii are 0.4 and 0.8 cm respectively.
An axial guide field of 5-10 kG is used. The device performance is mod
eled with a slow-time-scale nonlinear code, and self-fields and axial
velocity spread are included in the model. Simulation results show out
put powers above 2 kW at frequencies from 850 GHz to 1040 GHz can be a
chieved for voltages ranging from 0.93 to 1.07 MV.