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001026967 1001_ $$0P:(DE-HGF)0$$aHeidbrink, W. W.$$b0$$eCorresponding author
001026967 245__ $$aA research program to measure the lifetime of spin polarized fuel
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001026967 520__ $$aThe 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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001026967 65027 $$0V:(DE-MLZ)SciArea-200$$2V:(DE-HGF)$$aNuclear Physics$$x0
001026967 65017 $$0V:(DE-MLZ)GC-2001-2016$$2V:(DE-HGF)$$aNuclei and Particles$$x0
001026967 7001_ $$0P:(DE-HGF)0$$aBaylor, L. R.$$b1
001026967 7001_ $$0P:(DE-Juel1)131108$$aBüscher, Markus$$b2$$ufzj
001026967 7001_ $$0P:(DE-Juel1)131141$$aEngels, Ralf W.$$b3$$ufzj
001026967 7001_ $$0P:(DE-HGF)0$$aGarcia, A. V.$$b4
001026967 7001_ $$0P:(DE-HGF)0$$aGhiozzi, A. G.$$b5
001026967 7001_ $$0P:(DE-HGF)0$$aMiller, G. W.$$b6
001026967 7001_ $$0P:(DE-HGF)0$$aSandorfi, A. M.$$b7
001026967 7001_ $$0P:(DE-HGF)0$$aWei, X.$$b8
001026967 7001_ $$0P:(DE-HGF)0$$aZheng, X.$$b9
001026967 773__ $$0PERI:(DE-600)2721033-9$$a10.3389/fphy.2024.1355212$$gVol. 12, p. 1355212$$p1355212$$tFrontiers in physics$$v12$$x2296-424X$$y2024
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