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| Master Thesis | FZJ-2024-03329 |
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2024
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Please use a persistent id in citations: doi:10.34734/FZJ-2024-03329
Abstract: The phenomenon of hyperpolarization involves inducing heterogeneity in the occupancynumbers within the hyperfine states of an atom. This effect finds diverse applications, rangingfrom Nuclear Magnetic Resonance (NMR) to enhancing nuclear fusion processes throughthe concept of polarized fuel. At the Institute für Kernphysik, a method has been developedutilizing radio wave pumping and quantum interference to achieve significant polarizationin weak magnetic field regions. This thesis aims to provide both theoretical and experimentalinvestigation into the utilization of such hyperpolarization methods for a deuteriumbeam. The developed device involves two counter-current carrying solenoids. Ramping thecurrent in this device produces an oscillating spectrum directly correlating to quantum interferences.The simulation aspects offer detailed analyses of systematic effects within theexperimental setup. The results of Lamb-shift polarimeter measurements conducted for themetastable D beam recorded a polarization value of pzz ∼ -0.40 and pz ∼ -0.33 at amagnetic field value of 2.81 mT for the case of an electron polarized beam to the α hyperfinestates. Similarly, simulations predict a polarization value of pzz = 0.20 and pz = 0.09 fora magnetic field value of 2.86 mT . However, measurements with a ground state D beampresent a different scenario, failing to yield a comparable signal. Nonetheless, accordingto theoretical predictions based on simulations, for a magnetic field value of 2.75 mT, atensor polarization of pzz = -0.28 and vector polarization of pz = -0.04 can be expected.These findings suggest that such a method requires further investigation to provide moreexperimental results in order to support the mathematical description of the model.
Keyword(s): Nuclei and Particles (1st) ; Nuclear Physics (2nd)
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