A novel high power 3 GHz tunable 250 GHz gyrotron for Dynamic Nuclear Polarization

A. B Barnes; E. A Nanni; S Jawla; Q. Z Ni; J Herzfeld; R. G Griffin; R. J Temkin

doi:10.1109/IVEC.2012.6262183

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Conference proceeding

A novel high power 3 GHz tunable 250 GHz gyrotron for Dynamic Nuclear Polarization

A. B Barnes, E. A Nanni, S Jawla, Q. Z Ni, J Herzfeld, R. G Griffin and R. J Temkin

IVEC 2012, pp.329-330

04/2012

DOI: https://doi.org/10.1109/IVEC.2012.6262183

Abstract

Polarization

Gyrotrons

Bandwidth

Cavity resonators

gyrotron

dynamic nuclear polarization

Power generation

Tuning

Magnetic Resonance

Nuclear Magnetic Resonance

Designs and implementation of a novel tunable 250 GHz gyrotron oscillator for Dynamic Nuclear Polarization (DNP) experiments with >;10 W output power over most of a 3 GHz band and >;35 W peak power are shown. The bandwidth and power can generate a substantial THz field over the band used for DNP experiments, without the need for sweeping the NMR magnetic field. Substantially improved tunability is achieved by implementing a long (23 mm) interaction cavity that can excite higher order axial modes by changing either the magnetic field of the gyrotron or the cathode potential. This interaction cavity excites the rotating TE 5,2,q mode, and an internal mode converter outputs a high-quality microwave beam with >;94% Gaussian content. The gyrotron was integrated into a DNP spectrometer, resulting in 25% improved DNP enhancements.

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Title: A novel high power 3 GHz tunable 250 GHz gyrotron for Dynamic Nuclear Polarization
Creators: A. B Barnes - Dept. of Chem., Massachusetts Inst. of Technol. Cambridge, Cambridge, MA, USA
E. A Nanni - Dept. of Chem., Massachusetts Inst. of Technol. Cambridge, Cambridge, MA, USA
S Jawla - Dept. of Chem., Massachusetts Inst. of Technol. Cambridge, Cambridge, MA, USA
Q. Z Ni - Dept. of Chem., Massachusetts Inst. of Technol. Cambridge, Cambridge, MA, USA
J Herzfeld - Dept. of Chem., Massachusetts Inst. of Technol. Cambridge, Cambridge, MA, USA
R. G Griffin - Dept. of Chem., Massachusetts Inst. of Technol. Cambridge, Cambridge, MA, USA
R. J Temkin - Dept. of Chem., Massachusetts Inst. of Technol. Cambridge, Cambridge, MA, USA
Publication Details: IVEC 2012, pp.329-330
Publisher: IEEE
Identifiers: 9923972853401921
Academic Unit: Department of Chemistry
Language: English
Resource Type: Conference proceeding

A novel high power 3 GHz tunable 250 GHz gyrotron for Dynamic Nuclear Polarization

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