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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 |
| 001 | 1031189 | ||
| 005 | 20240923212339.0 | ||
| 024 | 7 | _ | |a 10.22323/1.456.0107 |2 doi |
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| 100 | 1 | _ | |a Heidbrink, W. W. |0 P:(DE-HGF)0 |b 0 |e Corresponding author |
| 111 | 2 | _ | |a 25th International Symposium on Spin Physics |g SPIN2023 |c Durham |d 2023-09-24 - 2023-09-29 |w USA |
| 245 | _ | _ | |a A research program to measure the lifetime of spin polarized fuel |
| 260 | _ | _ | |c 2024 |b Sissa Medialab Trieste, Italy |
| 295 | 1 | 0 | |a Proceedings of 25th International Symposium on Spin Physics — PoS(SPIN2023) - Sissa Medialab Trieste, Italy, 2024. - ISBN - doi:10.22323/1.456.0107 |
| 300 | _ | _ | |a 107 |
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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 $^7$Li-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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