Tunable 13C/1H dual channel matching circuit for dynamic nuclear polarization system with cross-polarization #DNPNMR

Rybalko, Oleksandr, Sean Bowen, Vitaliy Zhurbenko, and Jan Henrik Ardenkjar-Larsen. “Tunable 13C/1H Dual Channel Matching Circuit for Dynamic Nuclear Polarization System with Cross-Polarization.” In 2016 46th European Microwave Conference (EuMC), 1227–30. London, United Kingdom: IEEE, 2016.

https://doi.org/10.1109/EuMC.2016.7824571

In this paper we report initial results of design and practical implementation of tuning and matching circuit to estimate a performance of Dynamic Nuclear Polarization (DNP) at a magnetic field of 6.7 T. It is shown that developed circuit for signal observation is compact, easy to make and provides low return loss (typically better than – 45 dB) at a tuning range ±3 MHz for both resonant frequencies. In addition, transmission parameters measured between 13C and 1H channels are less than – 17 dB and – 50 dB for 71.8 MHz and 285.5 MHz, respectively showing a good isolation between the two channels. Measurement results with a tuning and matching circuit prototype are presented including obtained spectra (13C and 1H) and estimation of the signal-to-noise ratio.

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