Progress in the development of low-voltage gyrotron for integration with NMR spectrometer

While high-power, high-voltage gyrotrons for plasma fusion are most important gyrodevices nowadays, compact and less expensive gyrotron tubes with low operating voltage [1–4] could be an attractive opportunity for spectroscopic applications. The project of the medium-power gyrotron which can be integrated with nuclear magnetic resonance (NMR) spectrometer in a single cryomagnet (Fig. 1) is under development in the Institute of Applied Physics [1, 5]. This compact and low-voltage gyrotron (“gyrotrino”) is aimed at dynamic nuclear polarization (DNP) technique and should deliver the CW power about of 10 W at the frequency of 263 GHz. The integrated solution [2–3] could eliminate the need for an additional superconducting magnet, result in a shorter terahertz transmission line, and make DNP systems less expensive.