Seong-Tae Han, Robert Griffin, Kan-Nian Hu, Chan-Gyu Joo, Colin Joye, Ivan Mastovsky, Michael Shapiro, Jagadishwar Sirigiri, Richard Temkin, Antonio Torrezan, Paul Woskov
Recently, dynamic nuclear polarization enhanced nuclear magnetic resonance (DNP/NMR) has emerged as a
powerful technique to obtain significant enhancements in spin spectra from biological samples. For DNP in modern
NMR systems, a high power continuous-wave source in the submillimeter wavelength range is necessary. Gyrotrons
can deliver tens of watts of CW power at submillimeter wavelengths and are well suited for use in DNP/NMR
spectrometers. To date, 140 GHz and 250 GHz gyrotrons are being employed in DNP spectrometer experiments at
200 MHz and 380 MHz at MIT. A 460 GHz gyrotron, which has operated with 8 W of CW output power, will soon
be installed in a 700 MHz NMR spectrometer. High power radiation with good spectral and spatial resolution from
these gyrotrons should provide NMR spectrometers with high signal enhancement through DNP. Also, these tubes
operating at submillimeter wavelengths should have important applications in research in physics, chemistry, biology,
materials science and medicine.
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