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@INPROCEEDINGS{Faatz:1018251,
      author       = {Faatz, Nicolas and Engels, Ralf W. and Wirtz, Jan and
                      Lehrach, Andreas and Kannis, Chrysovalantis and Zheng, Chuan
                      and Soltner, Helmut and Felden, Olaf and Grigoryev, Kirill
                      and Büscher, Markus and Faatz, Nicolas and Gebel, Ralf and
                      Pütz, Simon Jakob},
      title        = {{F}irst test of a polarized $^3${H}e$^+$ ion source},
      school       = {RWTH Aachen},
      reportid     = {FZJ-2023-04647},
      year         = {2023},
      abstract     = {The use of polarized $^3$He ions in storage rings opens a
                      new window to investigate nuclear forces, because the
                      spin-dependent part of the differential cross section of the
                      observed reactions must stem in first order from the neutron
                      spin. Thus, nuclear polarized $^3$He$^{2+}$ beams can be
                      regarded as an ideal substitute for polarized neutron beams.
                      Polarized $^3$He ions were used in the 1960’s, but either
                      the nuclear polarization and/or the usable intensity of the
                      corresponding ion sources was rather small. Since then,
                      several groups around the world have been working on the
                      realization of an efficient polarized $^3$He ion source for
                      injection into storage rings. Current concepts are based on
                      the rapid ionization of optically-pumped polarized $^3$He
                      gas with polarization values up to 0.8. Nevertheless, most
                      of the different ionization processes tested so far result
                      in large polarization losses.A new approach at the Institute
                      for Nuclear Physics in the Research Center Jülich promises
                      to overcome the recent limitations with an intense (>10 μA)
                      polarized $^3$He$^{1+}$ beam with a polarization up to P ~
                      0.9 that can be used for stripping injection to feed storage
                      rings. The method itself is similar to “optical
                      pumping”, but instead of laser beams single radio-wave
                      pulses are used to induce transitions within the hyperfine
                      substates in the Zeeman region of a $^3$He$^{1+}$ beam at 4
                      keV. The corresponding photons are coherent and
                      monochromatic, and the induced transitions at an energy
                      level of 10$^{−8}$ eV interfere with each other. Based on
                      this phenomenon, the three substates of the F = 1 state can
                      be pumped into a single substate with $m_F =$ +1 or -1. The
                      corresponding polarization will be measured after
                      acceleration to about 100 MeV due to the known analyzing
                      powers of elastic scattering on protons with an existing
                      polarimeter behind the cyclotron JULIC. In principle, this
                      technique can be expanded to other ions, even heavy ions,
                      and may open the door for a new generation of polarized ion
                      sources or polarized fuel, thus increasing the energy output
                      of future fusion reactors.},
      month         = {Sep},
      date          = {2023-09-24},
      organization  = {25th International Spin Symposium,
                       Durham (USA), 24 Sep 2023 - 29 Sep
                       2023},
      subtyp        = {After Call},
      cin          = {IKP-2 / IKP-4 / PGI-6 / ZEA-1 / IKP-TA},
      cid          = {I:(DE-Juel1)IKP-2-20111104 / I:(DE-Juel1)IKP-4-20111104 /
                      I:(DE-Juel1)PGI-6-20110106 / I:(DE-Juel1)ZEA-1-20090406 /
                      I:(DE-Juel1)VDB521},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612)},
      pid          = {G:(DE-HGF)POF4-612},
      typ          = {PUB:(DE-HGF)6},
      doi          = {10.34734/FZJ-2023-04647},
      url          = {https://juser.fz-juelich.de/record/1018251},
}