Development of a Quasi-optical Transmission System for Gyrotron Application as a Radiation Source

Ogawa, I.; Idehara, T.; Myodo, M.; Ando, Hirohiko; Wágner, D.; Thumm, M.

doi:10.1109/icimw.2006.368760

Cited by 1 publication

(1 citation statement)

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“…Recently, a very long transmission line using corrugated waveguides and switches has been successfully implemented on a 260 GHz gyrotron system for DNP NMR [96], [97]. A fully optical (mirror) transmission line using a mirror relay line has also recently been implemented for a DNP NMR spectrometer system [98]. Future research will concentrate on making these transmission lines simpler and more efficient.…”

Section: Transmission Linesmentioning

confidence: 99%

THz Dynamic Nuclear Polarization NMR

Nanni

Barnes

Griffin

et al. 2011

IEEE Trans. Terahertz Sci. Technol.

166

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Dynamic nuclear polarization (DNP) increases the sensitivity of nuclear magnetic resonance (NMR) spectroscopy by using high frequency microwaves to transfer the polarization of the electrons to the nuclear spins. The enhancement in NMR sensitivity can amount to a factor of well above 100, enabling faster data acquisition and greatly improved NMR measurements. With the increasing magnetic fields (up to 23 T) used in NMR research, the required frequency for DNP falls into the THz band (140–600 GHz). Gyrotrons have been developed to meet the demanding specifications for DNP NMR, including power levels of tens of watts; frequency stability of a few megahertz; and power stability of 1% over runs that last for several days to weeks. Continuous gyrotron frequency tuning of over 1 GHz has also been demonstrated. The complete DNP NMR system must include a low loss transmission line; an optimized antenna; and a holder for efficient coupling of the THz radiation to the sample. This paper describes the DNP NMR process and illustrates the THz systems needed for this demanding spectroscopic application. THz DNP NMR is a rapidly developing, exciting area of THz science and technology.

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Section: Transmission Linesmentioning

confidence: 99%