Title :
Progress of a 140 GHz gyro-amplifier using a confocal waveguide
Author :
Soane, Alexander V. ; Guss, William C. ; Jawla, Sudheer ; Shapiro, Michael A. ; Temkin, Richard J.
Author_Institution :
Plasma Sci. & Fusion Center, MIT Cambridge, Cambridge, MA, USA
Abstract :
We report on the progress of a 140 GHz, 1 kW pulsed gyro-amplifier system being developed at MIT for enhanced Dynamic Nuclear Polarization for NMR (DNP-NMR). A confo-cal geometry configuration is being studied as an approach to an overmoded interaction waveguide. The gyro-amplifier has achieved 875 W of peak power at 12.5 dB of saturated system gain and 21 dB of linear system gain. Current efforts include optimizing the gyro-amplifier operation, as well as the installation of an internal output mode converter and a corrugated input transmission line system.
Keywords :
gyrotrons; millimetre wave power amplifiers; millimetre wave tubes; nuclear polarisation; waveguides; DNP-NMR; MIT; confocal geometry configuration; corrugated input transmission line system; dynamic nuclear polarization; frequency 140 GHz; gain 12.5 dB; gain 21 dB; internal output mode converter; overmoded interaction confocal waveguide; power 1 kW; power 875 W; pulsed gyroamplifier system; Abstracts; Bandwidth; Couplings; Gain; Geometry; Microwave amplifiers; Transmission line measurements; Gyrotron; confocal waveguide; gyro-amplifier;
Conference_Titel :
Vacuum Electronics Conference, IEEE International
Conference_Location :
Monterey, CA
DOI :
10.1109/IVEC.2014.6857502
