Simulation of higher-harmonics generation in a FEL - Kuruma, S.-i.; Mima, K.; Ohi, K.; Nakai, S.; Yamanaka, C. (Elsevier)
Nonlinear evolution of higher-harmonics radiation in a free electron laser is studied by a 1D simulation code. The parameters of the induction linac FEL at ILE are: electron beam energy E"b = 6 MeV, current I"b = 100 A, radius r"b = 3 mm, wiggler wavelength λ"w = 6 cm, magnetic field B"w = 3.2 kG, wiggler length L"w = 3 m, input power P"i"1 = 1 kW at λ"s"1 = 515 μm, we calculated that the output power at the fundamental, 3rd (λ"s"3 = 172 μm) and 5th (λ"s"5 = 103 μm) harmonic is 30, 1 and 0.15 MW, respectively. The electron beam current dependence of the radiation output power has been studied. It has been found that the radiation power P"n (n = 1, 3, 5) is approximately proportional to I"b^1^.^1^7. Furthermore, we found that the fundamental mode is efficiently converted to the higher harmonics when a high-intensity fundamental mode is injected and the wiggler is inversely tapered.
http://linkinghub.elsevier.com/retrieve/pii/0168-9002(91)90944-L
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