Author: Getmanov, Ya.V.
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MOCOZBS03
 Recent Advances in Terahertz Photonics and Spectroscopy at Novosibirsk Free Electron Laser  
 
  • Y. Choporova
    BINP, Novosibirsk, Russia
  • V.V. Gerasimov, B.A. Knyazev
    NSU, Novosibirsk, Russia
  • Ya.V. Getmanov, B.A. Knyazev, G.N. Kulipanov, O.A. Shevchenko, N.A. Vinokurov
    BINP SB RAS, Novosibirsk, Russia
  
  The Novosibirsk free electron laser facility (NovoFEL) operates in the spectral range from 5 to 240 micrometer. High power, narrow linewidth and frequency tunability enable a wide variety of experiments. NovoFEL has eleven user stations open to local and external users. In this paper, we survey selected experiments in photonics performed recently at the facility, such as ellipsometry, holography, surface plasmon polaritons study, pump-probe spectroscopy, and the investigation of the Talbot effect. Additionally, this paper will focus on another field of terahertz (THz) photonics, the transformation of (FEL) radiation into modes different from a Gaussian. Optical elements for intense THz waves differ from classical optical elements. Diffractive optical elements (DOEs) become beneficial for beam manipulation. For instance, in biological experiments a uniform irradiation of substances might be necessary; beams with radial polarization may be required in experiments on the generation of plasmons on wires; pencil-like or "nondiffractive" Bessel beams could be applied to radioscopy of extended objects, etc. A brief overview of THz beam transformations with DOEs will be given.
All experiments were carried out using equipment of the Siberian Center for Synchrotron and Terahertz Radiation. The authors are grateful to the NovoFEL team for continuous support of the experiments. 		 
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WEPNEC16 Electron Outcoupling System of Novosibirsk Free Electron Laser Facility - Beam Dynamics Calculation and the First Experiments 98
 
  • Ya.V. Getmanov, A.S. Matveev, O.A. Shevchenko, N.A. Vinokurov
    BINP SB RAS, Novosibirsk, Russia
  • Ya.V. Getmanov, A.S. Matveev, N.A. Vinokurov
    NSU, Novosibirsk, Russia
  
  The radiation power of the FEL with optical cavity can be limited by the overheating of reflecting mirrors. In the electron outcoupling scheme electron beam radiates the main power at a slight angle to the optical axis. For this, it is necessary to divide undulator by a dipole magnet at least in two parts - the first for the electron beam bunching in the field of the main optical mode, and the second for the power radiation by deflected beam. Electron outcoupling system is installed on the third FEL based on the multiturn energy recovery linac of the Novosibirsk Free Electron Laser facility (NovoFEL). It consists of three undulators, dipole correctors and two quadrupole lenses assembled between them. There are two different configurations of the system since the electrons can be deflected in either the second or the third undulator. The electron beam dynamics calculations and the results of the first experiments are presented.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-ERL2019-WEPNEC16  
About • paper received ※ 01 October 2019       paper accepted ※ 06 November 2019       issue date ※ 24 June 2020  
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THCOZBS01
 Novosibirsk ERL injector  
 
  • O.A. Shevchenko, V.S. Arbuzov, K.N. Chernov, I.V. Davidyuk, O.I. Deichuli, E.N. Dementyev, B.A. Dovzhenko, Ya.V. Getmanov, A.A. Kondakov, V.R. Kozak, E.V. Kozyrev, S.A. Krutikhin, G.N. Kulipanov, E.A. Kuper, I.V. Kuptsov, G.Y. Kurkin, A.S. Matveev, L.E. Medvedev, S.V. Motygin, V.N. Osipov, V.K. Ovchar, 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, V.G. Tcheskidov, A.G. Tribendis, N.A. Vinokurov, V. Volkov
    BINP SB RAS, Novosibirsk, Russia
  • I.V. Davidyuk, Ya.V. Getmanov, E.V. Kozyrev, S.S. Serednyakov, N.A. Vinokurov
    NSU, Novosibirsk, Russia
  • A.G. Tribendis
    NSTU, Novosibirsk, Russia
  
  The Novosibirsk ERL is the first in the world multi-orbit ERL with high average current. It is used as a source of electron bunches for three powerful FEL-oscillators which operate in CW mode. In present configuration the ERL Injector comprises a 300-kV electrostatic gun with thermionic cathode, as well as one bunching and two accelerating cavities separated by the drift space which is used for bunch compression. In near future the new RF gun will be added to this configuration. The basic requirement for the injector is to provide beam parameters necessary for FEL operation. These parameters include bunch charge more than 1 nQ and repetition rate about 10 MHz. Very small emittance and very short pulse duration are not required in our case because of long FEL radiation wavelength and low RF frequency of the main linac. We present detailed description of the injector setup and results of beam parameters measurements. The measured parameters are compared with simulation results. We also discuss future upgrade which includes installation of the new RF gun.  
slides icon Slides THCOZBS01 [18.483 MB]  
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FRCOXBS01
 Electronic Modulation of the FEL-Oscillator Radiation Power Driven by ERL  
 
  • O.A. Shevchenko, E.V. Bykov, Ya.V. Getmanov, S.S. Serednyakov, S.V. Tararyshkin
    BINP SB RAS, Novosibirsk, Russia
  • M.V. Fedin, S.L. Veber
    International Tomography Center, SB RAS, Novosibirsk, Russia
  • Ya.V. Getmanov, S.S. Serednyakov
    NSU, Novosibirsk, Russia
  
  Funding: RSF grant no. 17-13-01412
FEL oscillators usually operate in CW mode and produce periodic train of radiation pulses but some user experiments require modulation of radiation power. Conventional way to obtain this modulation is using of mechanical shutters however it cannot provide very short switching time and may lead to decreasing of the radiation beam quality. Another way could be based on the electron beam current modulation but it cannot be used in the ERL. We propose a simple way of fast control of the FEL lasing which is based on periodic phase shift of electron bunches with respect to radiation stored in optical cavity. The phase shift required to suppress lasing is relatively small and it does not change significantly repetition rate. This approach has been realized at NovoFEL facility. It allows to generate radiation macropulses of desirable length down to several microseconds (limited by quality factor of optical cavity and FEL gain) which can be synchronized with external trigger. We present detailed description of electronic power modulation scheme and discuss the results of experiments. 		 
slides icon Slides FRCOXBS01 [7.025 MB]  
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