Design and experimental results from a 527 GHz gyrotron for DNP-NMR spectroscopy

Author

Jawla, Sudheer K. ; Guss, William C. ; Shapiro, Michael A. ; Temkin, Richard J.

Author_Institution

Plasma Sci. & Fusion Center, Massachusetts Inst. of Technol., Cambridge, MA, USA

fYear

2014

fDate

14-19 Sept. 2014

Firstpage

1

Lastpage

2

Abstract

A 527 GHz gyrotron has been designed and built for an 800 MHz DNP-NMR spectrometer. The gyrotron is designed at the second harmonic (ω=2 ω_c) of the electron cyclotron frequency to produce 20 W continuous microwave power at 527 GHz frequency using a diode type electron gun (V_k ~ 13.0 kV, I_b=150 mA). An internal dimpled wall helical cut launcher is designed along with two mirrors and an internal periscope assembly to convert the operating mode in to a fundamental mode, HE₁₁, of a corrugated waveguide with mode content of ~ 93%.

Keywords

NMR spectroscopy; UHF tubes; assembling; diodes; dynamic nuclear polarisation; electron guns; gyrotrons; mirrors; submillimetre wave tubes; waveguides; DNP-NMR spectrometer; DNP-NMR spectroscopy; HE₁₁ mode; corrugated waveguide; current 150 mA; diode type electron gun; dynamic nuclear polarization; electron cyclotron frequency; frequency 527 GHz; frequency 800 MHz; gyrotron; internal dimpled wall helical cut launcher; internal periscope assembly; mirror; power 20 W; Assembly; Gyrotrons; Harmonic analysis; Magnetic fields; Polarization; Spectroscopy; Superconducting magnets;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on

Conference_Location

Tucson, AZ

Type

conf

DOI

10.1109/IRMMW-THz.2014.6956164

Filename

6956164