A Super-Wide Bore DNP System for Multiple Sample Polarization: Cryogenic Performance and Polarization at Low Temperature
| Autor: | Florent Goutailler, D. Grand, Pierre-Etienne Wolf, Gerard Vermeulen, Yannick Crémillieux, Bruno Montcel |
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| Rok vydání: | 2012 |
| Předmět: |
Cryostat
Materials science Solid-state physics business.industry Hold time Liquid helium Analytical chemistry Polarizer 010402 general chemistry Polarization (waves) 7. Clean energy 01 natural sciences Atomic and Molecular Physics and Optics 030218 nuclear medicine & medical imaging 0104 chemical sciences law.invention 03 medical and health sciences 0302 clinical medicine Optics law Magnet business Microwave cavity |
| Zdroj: | Applied Magnetic Resonance. 43:167-180 |
| ISSN: | 1613-7507 0937-9347 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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