Progress of a 140 GHz gyro-amplifier for DNP NMR Studies

POSTER

Abstract

We report on the experimental progress of a 140 GHz pulsed gyro-amplifier being developed at MIT for enhanced Dynamic Nuclear Polarization for NMR (DNP-NMR). A confocal geometry configuration is being studied as an approach to an overmoded interaction waveguide. The system has achieved 20 dB of gain and 150 watts of peak power over a 2 $\mu$s pulse. Additionally, computational work has been performed that investigates the effect of the cylindrically-asymmetric confocal geometry on predicted gain. The computational results show that while linear gain is equivalent to that of a circular interaction waveguide, saturated gain is lower by as much as 50\%.

*Research supported by NIH/NIBIB grant R01-EB001965

Authors

  • Alexander Soane

    • PSFC MIT

  • Emilio Nanni

    • PSFC MIT
    • Massachusetts Institute of Technology
    • Plasma Science and Fusion Center, MIT, Cambridge, MA, USA

  • Michael Shapiro

    • Plasma Science and Fusion Center, Massachusetts Institute of Technology
    • PSFC MIT
    • Massachusetts Institute of Technology
    • Plasma Science and Fusion Center, MIT, Cambridge, MA, USA

  • Richard Temkin

    • Plasma Science and Fusion Center, Massachusetts Institute of Technology
    • PSFC MIT
    • Massachusetts Institute of Technology
    • Plasma Science and Fusion Center, MIT, Cambridge, MA, USA