• N.A.Vinokurov, D.A.Kayran, B.A.Knyazev, E.I.Kolobanov, V.V.Kotenkov, V.V.Kubarev, G.N.Kulipanov, A.V.Kuzmin, A.S.Lakhtychkin, A.N.Matveenko, L.E.Medvedev, S.V.Miginsky, L.A.Mironenko, A.D.Oreshkov, V.K.Ovchar, V.M.Popik, T.V.Salikova, S.S.Serednyakov, A.N.Skrinsky, O.A.Shevchenko, M.A.Scheglov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

The first stage of Novosibirsk high power free electron laser (FEL) was commissioned in 2003. It is based on the normal conducting CW energy recovery linac (ERL). Now the FEL provides electromagnetic radiation in the wavelength range 120 - 230 micron. The maximum average power is 400 W. The minimum measured line width is 0.3%, which is close to the Fourier-transform limit. Four user stations are in operation now. Manufacturing of the second stage of the FEL (based on the four-turn ERL) is in progress.

• N.A.Vinokurov, G.Ya.Kurkin, L.E.Medvedev, L.A.Mironenko., A.D.Oreshkov, T.V.Salikova, M.A.Scheglov
  Budker Institute of Nuclear Physics, Novosibirsk, Russia

In this article is described the vacuum system of the powerful terahertz free electron laser constructed in the Siberian Center for Photochemical Research. Vacuum system of FEL contains the new technological decisions: standby blocks - power supply of pumps; hardware and software intended for the vacuum's monitoring and ensuring the protection of some technological units of FEL in case of vacuum's downturn

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