Continuously Tunable 250 GHz Gyrotron with a Double Disk Window for DNP-NMR Spectroscopy

  • Sudheer Jawla
  • Qing Zhe Ni
  • Alexander Barnes
  • William Guss
  • Eugenio Daviso
  • Judith Herzfeld
  • Robert Griffin
  • Richard Temkin


In this paper, we describe the design and experimental results from the rebuild of a 250 GHz gyrotron used for Dynamic Nuclear Polarization enhanced Nuclear Magnetic Resonance spectroscopy on a 380 MHz spectrometer. Tuning bandwidth of approximately 2 GHz is easily achieved at a fixed magnetic field of 9.24 T and a beam current of 95 mA producing an average output power of >10 W over the entire tuning band. This tube incorporates a double disk output sapphire window in order to maximize the transmission at 250.58 GHz. DNP Signal enhancement of >125 is achieved on a 13C-Urea sample using this gyrotron.


Gyrotron Double disk window Frequency tunable Gaussian beam Waveguide 



This research was supported by the National Institutes of Health through grants EB002804, EB003151, EB002026, EB001960, EB001035, EB001965, and EB004866. We also thank Ivan Mastovsky for helping during the fabrication and assembling of the components.


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Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  • Sudheer Jawla
    • 1
  • Qing Zhe Ni
    • 2
  • Alexander Barnes
    • 2
  • William Guss
    • 1
  • Eugenio Daviso
    • 2
    • 3
  • Judith Herzfeld
    • 3
  • Robert Griffin
    • 2
  • Richard Temkin
    • 1
  1. 1.Plasma Science and Fusion CenterMassachusetts Institute of TechnologyCambridgeUSA
  2. 2.Francis Bitter Magnet Lab and Department of ChemistryMassachusetts Institute of TechnologyCambridgeUSA
  3. 3.Department of ChemistryBrandies UniversityWalthamUSA

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