A Compact THz Source for Enhancing the Sensitivity of Nuclear Magnetic Resonance Spectroscopy with Dynamic Nuclear Polarization

High-power terahertz radiation finds application in electron paramagnetic resonance spectroscopy and is used to enhance the sensitivity of nuclear magnetic resonance spectroscopy through dynamic nuclear polarization. The compact source of terahertz radiation proposed in this work follows the gyrotron scheme and relies on the proximity of the paramagnetic-resonance and cyclotron frequencies for electrons. However, the design of this terahertz source differs greatly from those of conventional gyrotrons. Simulations of its performance show that terahertz radiation with required parameters can be obtained with applied voltages below 2 kV. Experimental tests demonstrate that stimulated synchrontron radiation can indeed be generated at such nonrelativistic voltages.