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| Hauptseite > Publikationsdatenbank > A research program to measure the lifetime of spin polarized fuel > print |
| Hauptseite > Publikationsdatenbank > A research program to measure the lifetime of spin polarized fuel > print |
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| 100 | 1 | _ | |a Heidbrink, W. W. |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 245 | _ | _ | |a A research program to measure the lifetime of spin polarized fuel |
| 260 | _ | _ | |a Lausanne |c 2024 |b Frontiers Media |
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| 520 | _ | _ | |a The use of spin polarized fuel could increase the deuterium-tritium (D-T) fusion cross section by a factor of 1.5 and, owing to alpha heating, increase the fusion power by an even larger factor. Issues associated with the use of polarized fuel in a reactor are identified. Theoretically, nuclei remain polarized in a hot fusion plasma. The similarity between the Lorentz force law and the Bloch equations suggests polarization can be preserved despite the rich electromagnetic spectrum present in a magnetic fusion device. The most important depolarization mechanisms can be tested in existing devices. The use of polarized deuterium and $^3$He in an experiment avoids the complexities of handling tritium, while encompassing the same nuclear reaction spin-physics, making it a useful proxy to study issues associated with full D-T implementation. $^3$He fuel with 65% polarization can be prepared by permeating optically-pumped $^3$He into a shell pellet. Dynamically polarized 7Li-D pellets can achieve 70% vector polarization for the deuterium. Cryogenically-frozen pellets can be injected into fusion facilities by special injectors that minimize depolarizing field gradients. Alternatively, polarized nuclei could be injected as a neutral beam. Once injected, the lifetime of the polarized fuel is monitored through measurements of escaping charged fusion products. Multiple experimental scenarios to measure the polarization lifetime in the DIII-D tokamak and other magnetic-confinement facilities are discussed, followed by outstanding issues that warrant further study. |
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| 773 | _ | _ | |a 10.3389/fphy.2024.1355212 |g Vol. 12, p. 1355212 |0 PERI:(DE-600)2721033-9 |p 1355212 |t Frontiers in physics |v 12 |y 2024 |x 2296-424X |
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