CW results of a 460 GHz second harmonic gyrotron oscillator - for sensitivity enhanced NMR

We report microsecond pulse and CW results of a gyrotron operating near 460 GHz and 230 GHz at the second electron cyclotron harmonic and fundamental, respectively. Peak power levels of up to 70 W at the fundamental and 3 W at the second harmonic have been obtained in operation at up to 13 kV and 15...

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Bibliographic Details
Main Authors: Hornstein, M.K., Bajaj, V.S., Griffin, R.G., Kreischer, K.E., Mastovsky, I., Shapiro, M.A., Sirigiri, J.R., Temkin, R.J., Woskov, P.P.
Format: Conference Proceeding
Language:English
Subjects:
Cyclotrons
Electrons
Frequency
Gyrotrons
Magnetic resonance
Nuclear magnetic resonance
Oscillators
Polarization
Power system harmonics
Wideband
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Summary:We report microsecond pulse and CW results of a gyrotron operating near 460 GHz and 230 GHz at the second electron cyclotron harmonic and fundamental, respectively. Peak power levels of up to 70 W at the fundamental and 3 W at the second harmonic have been obtained in operation at up to 13 kV and 150 mA. The gyrotron has been operated continuously to achieve 3 W CW at the second harmonic. The gyrotron was also demonstrated as a wideband continuous frequency tunable oscillator by magnetically exciting fundamental higher order longitudinal modes. The gyrotron oscillator can be used for dynamic nuclear polarization (DNP) studies in conjunction with a 700 MHz (/sup 1/H), 16.5 T nuclear magnetic resonance (NMR) spectrometer.
DOI:10.1109/ICIMW.2004.1421996