THz Gyrotron and BWO Designed for Operation in DNP-NMR Spectrometer Magnet

  • V. L. Bratman
  • A. E. FedotovEmail author
  • Yu. K. Kalynov
  • P. B. Makhalov
  • A. Samoson


Dynamic nuclear polarization (DNP) in high-field nuclear magnetic resonance (NMR) spectroscopy requires medium-power terahertz radiation, which nowadays can be provided basically by gyrotrons with superconducting magnets. As the electron cyclotron frequency is very close to the frequency of electron paramagnetic resonance for the same magnetic field, under certain conditions the gyrotron can be installed inside the same solenoid used for NMR spectrometer. This eliminates the need for an additional superconducting magnet, results in a shorter terahertz transmission line, and can make DNP systems practical. In addition to an extremely low-voltage gyrotron (“gyrotrino”), we analyze also advantages of strong magnetic field for a slow-wave electron device as an alternative terahertz source.


Gyrotron Backward-wave oscillator DNP-NMR spectroscopy Superconducting magnet 



The reported study was partially supported by RFBR, research projects Nos. 12-02-31722, 13-02-01176.


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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • V. L. Bratman
    • 1
    • 2
  • A. E. Fedotov
    • 1
    Email author
  • Yu. K. Kalynov
    • 1
  • P. B. Makhalov
    • 1
  • A. Samoson
    • 3
    • 4
  1. 1.Institute of Applied Physics of the Russian Academy of SciencesNizhny NovgorodRussia
  2. 2.Nizhny Novgorod State UniversityNizhny NovgorodRussia
  3. 3.Tallinn University of TechnologyTallinnEstonia
  4. 4.Physics DepartmentUniversity of WarwickCoventryUK

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