International Journal of Terahertz Science and Technology
  TST >> Vol.1, No.2, June 2008: PP. 107-125

Research Highlights from the Novosibirsk 400 W average power THz FEL

G. N. Kulipanov 1, N.G. Gavrilov 1, B.A. Knyazev 1, E.I. Kolobanov 1, V.V. Kotenkov 1, V.V. Kubarev 1, A.N.Matveenko 1, L.E. Medvedev 1, S.V. Miginsky 1, L. A. Mironenko 1, V. K. Ovchar 1, V.M. Popik 1, T.V. Salikova 1, M.A. Scheglov 1, S.S. Serednyakov 1, O.A. Shevchenko 1, A.N. Skrinsky 1, V.G. Tcheskidov 1, N.A. Vinokurov 1, M.A. Demyanenko 2, D.G.Esaev 2, E.V. Naumova 2, V.Y. Prinz 2, V.P. Fedin 3, A.M.Gonchar 4, S.E. Peltek 4, A.K. Petrov 5, L.A. Merzhievsky 6, V.S. Cherkassky 7,
1 Budker Institute of Nuclear Physics, 630090 Novosibirsk, Russia
2 Rzhanov Institute of Semiconductor Physics, 630090 Novosibirsk, Russia
3 Nikolaev Institute of Inorganic Chemistry, 630090 Novosibirsk, Russia
4 Institute of Cytology and Genetics, 630090 Novosibirsk, Russia
5 Institute of Chemical Kinetics and Combustion, 630090 Novosibirsk, Russia
6 Lavrentyev Institute of Hydrodynamics, 630090 Novosibirsk, Russia
7 Novosibirsk State University, 630090 Novosibirsk, Russia

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Abstract: The first stage of the Novosibirsk high power free electron laser (NovoFEL) was commissioned in 2003. It is a CW FEL based on non-superconducting, low-frequency (180 MHz) single-pass accelerator-recuperator with the following parameters: the electron energy is 12 MeV; charge per bunch is 1,5 nC; the bunch repetition rate is 5.6 to 22.5 MHz; the maximum average current is 30 mA; the bunch duration is 40 to 100 ps. The radiation spectral range is 110 - 240 μm at the first harmonics, 60 - 117 μm and 40 - 80 μm at the second and third harmonics correspondingly. The maximum average power is up to 0.4 kW for the first harmonics. The maximum average power of the second and third harmonics is 2% and 0.6% with respect to the first harmonics. The maximum peak power is 1 MW, and the repetition frequency is 5.6 and 11.2 MHz. The relative spectral width is 0.25 C 1%. The radiation is completely spatial coherent, and the degree of linear polarization of radiation is better than 99.6 %.Laser radiation is transmitted through nitrogen-filled optical beamline to the experimental hall. To provide ultrahigh vacuum in the FEL and accelerator-recuperator, their vacuum volume is separated from the beamline by a diamond window. Four user stations (the diagnostic station, the photochemistry station, the biological station, and the THz imaging station) are in operation now. Two other stations are under construction: the station for introscopy and spectroscopy, and the aerodynamics station. The high average power of the FEL enables development of imaging techniques. Several methods for two-dimensional visualization of THz radiation, including an uncooled microbolometer camera for THz high-speed imaging with a time resolution of 1 to10-2 s, have been developed. Instrumentation for the experimental station is developed and tested (windows, beam splitters, pyroelectric detectors, bolometers, Fresnel zone plates, and kinoform lenses). During the last year the NovoFEL was operating as a user facility. Soft ablation of biological molecules under terahertz radiation has been studied at the NovoFEL during the last three years. Precisely tuning radiation energy, one can achieve the regime when "biological" molecules (DNA, proteins, etc) are "evaporated" without defragmentation. These results can lead to creation of new biotechnologies. Experiments in physics, chemistry, biology, condensed matter and technology at four user stations are surveyed in this paper. Next year we plan to commission the second stage of the NovoFEL, based on the four-track 40 MeV accelerator-recuperator, using the same accelerating RF structure as the first stage. The FELs in the second and fourth tracks are to generate radiation in the spectral ranges of 5-30 μm and 30-100 μm, respectively. The expected power of each FEL is more than 1 kW.

Keywords: THz FEL, Novosibirsk high power free electron laser.

Published: 2008-06-26

Acknowledgments: This work is supported by Russian Ministry for Education and Science by Contract ″02.552.11.7009 (Collective Centers) for the Siberian Synchrotron and Terahertz Radiation Center and by grant RNP., supported by Siberian Branch of the Russian Academy of Science by Integration grants 174/6 and 22/6, and supported by Russian Foundation for Basic Research by grant RFBR-07-02-13547.

Cite this article:
G. N. Kulipanov, N.G. Gavrilov, B.A. Knyazev, E.I. Kolobanov, V.V. Kotenkov, V.V. Kubarev, A.N.Matveenko, L.E. Medvedev, S.V. Miginsky, L. A. Mironenko, V. K. Ovchar, V.M. Popik, T.V. Salikova, M.A. Scheglov, S.S. Serednyakov, O.A. Shevchenko, A.N. Skrinsky, V.G. Tcheskidov, N.A. Vinokurov, M.A. Demyanenko, D.G.Esaev, E.V. Naumova, V.Y. Prinz, V.P. Fedin, A.M.Gonchar, S.E. Peltek, A.K. Petrov, L.A. Merzhievsky, V.S. Cherkassky. Research Highlights from the Novosibirsk 400 W average power THz FEL[J]. International Journal of Terahertz Science and Technology, 2008, Vol.1, No.2: 107-125.  DOI:10.11906/TST.107-125.2008.06.11




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