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A Super-Wide Bore DNP System for Multiple Sample Polarization: Cryogenic Performance and Polarization at Low Temperature |
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| Authors: | Yannick Crémillieux Florent Goutailler Bruno Montcel Dominique Grand Gérard Vermeulen Pierre-Etienne Wolf |
| Affiliation: | 1. Centre de Recherche Cardio-Thoracique, Université Bordeaux Segalen, 146 rue Léo-Saignat, U1045, Batiment TP, 33076, Bordeaux, France 2. CREATIS, Université Lyon-1, Lyon, France 3. Institut Néel, CNRS, Université Joseph Fourier, Grenoble, France |
| Abstract: | The volume of polarized sample and the delay required between successive polarizations of samples represent serious constraints for dynamic nuclear polarization (DNP) applications. With these limitations in mind, a DNP polarizer, based on a super-wide bore (150-mm diameter) vertical magnet operating at 3.35?T, was designed. The working diameter for loading/unloading samples is equal to 46?mm and the microwave cavity can accommodate up to three samples. The cryostat can be cooled to 4.2?K in typically 2?h and filled with liquid helium in 1?h. Once filled with liquid helium, the cryostat hold time is on the order of 4?h and a minimum temperature of 1.19?K can be reached. In situ polarization levels at low temperature were measured between 5 and 10?% in single and multiple samples of 13C-labeled urea and glycine. |
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