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6The NovoFEL facility - source of high-power, narrow-band, tunable in wide range terahertz radiation
O.A. Shevchenko*, N.A. Vinokurov, V.S. Arbuzov, K.N. Chernov, O.I. Deichuly, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, Ya.I. Gorbachev, D.A. Kolomeec, A.A. Kondakov,
V.R. Kozak, E.V. Kozyrev, S.A. Krutikhin, V.V. Kubarev, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Ya. Kurkin, L.E. Medvedev, S.V. Motygin, V.K. Ovchar, V.N. Osipov, V.M. Petrov, A.M. Pilan, V.M. Popik, V.V. Repkov, T.V. Salikova, M.A. Scheglov, I.K. Sedlyarov, S.S. Serednyakov, A.N. Skrinsky, S.V. Tararyshkin, A.G. Tribendis, V.G. Tcheskidov,
M.G. Vlasenko, V.N. Volkov
Budker Institute of Nuclear Physics, 11, Acad. Lavrentieva Pr., Novosibirsk, 630090, Russia
The Novosibirsk free electron laser (FEL) facility includes three FELs operating in terahertz, far-and mid-infrared spectral ranges. The FELs undulators are installed on different tracks of the multi-turn energy recovery linac. The first FEL of this facility has been operating for users of terahertz radiation since 2004. Its initial wavelength range had been 90 - 240 ^m but recently it was increased up to 400 ^m. This FEL still remains the world's most powerful source of coherent narrow-band radiation in its wavelength range.
The second FEL was commissioned in 2009. The wavelength range of this FEL had been 35 - 80 ^m until its old electromagnetic undulator was replaced by a new undulator with variable period in 2021. After this undulator replacement we obtained lasing in the wavelength range 15 - 120 ^m and in a couple of years we increased this range up to 156 ^m. Recently we also demonstrated high macropulse averaged radiation power (more than 800 W) at the wavelength of 70 ^m.
The third FEL was commissioned in 2015 to cover the wavelength range of 5 - 20 ^m. Its undulator comprises three separate sections. Such lattice suits very well to demonstrate the new off-mirror way of radiation outcoupling in FEL oscillator (so-called electron outcoupling) which we also plan to do in near future.
In this talk we present overview of the facility and discuss our recent achievements and future plans.
