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@PHDTHESIS{Chekmenev:834702,
      author       = {Chekmenev, Stanislav},
      title        = {{I}nvestigation of {P}ossibilities to {M}easure the
                      {D}euteron {E}lectric {D}ipole {M}oment at {S}torage
                      {R}ings},
      school       = {RWTH Aachen},
      type         = {Dr.},
      publisher    = {RWTH Aachen University},
      reportid     = {FZJ-2017-04605},
      pages        = {138 p.},
      year         = {2017},
      note         = {RWTH Aachen, Diss., 2017},
      abstract     = {The interest in electric dipole moment (EDM) experiments is
                      highly motivated by the problem of matter-antimatter
                      asymmetry in our universe. New sources of CP-violation are
                      needed to explain that phenomenon properly. An EDM of an
                      elementary particle is a perfect candidate to search for
                      these sources because its existence requires CP-violation
                      beyond the Standard Model to be detected. New experiments
                      for the EDM of charged hadrons are proposed. These
                      experiments require a new type of storage ring to be built.
                      Since an EDM could be as small as 10-29 e·cm, a fantastic
                      precision should be achieved. The main cause that limits a
                      potential sensitivity of future experiments are systematic
                      errors. This thesis investigates possible ways to minimize
                      various systematic errors for two versions of a new storage
                      ring and for the precursor experiment, which will be
                      performed by the JEDI (Jülich Electric Dipole moments
                      Investigations) collaboration at the existing Cooler
                      Synchrotron COSY. To study the impact of the systematic
                      errors a large number of spin-orbit tracking simulations
                      were performed in the newly developed program MODE. Two
                      approaches for using a new storage ring were studied: the
                      frozen and the quasi-frozen spin method. In addition, the
                      precursor experiment at COSY was studied. The results of a
                      test run conducted in 2014 made possible to benchmark and
                      adjust the accelerator model and improve the simulation
                      environment. One of the main quantities that defines the
                      sensitivity is the spin decoherence, which takes place at
                      any storage ring. The finite size of the bunch in all three
                      directions, radial, vertical and longitudinal causes the
                      particles’ spins to decohere. Using an RF cavity and a
                      combination of sextupoles allows one to maximize the time
                      during which the spins stay parallel to each other in the
                      horizontal plane. The main source of systematic error is the
                      misalignment of the elements inside the ring. For a
                      dedicated storage ring, it was proposed to launch two beams
                      in opposite directions (clockwise and counter-clockwise) to
                      average out its impact. For the precursor experiment, the
                      frequency mismatch between an RF Wien filter device that
                      will be used and the frequency of the spin rotation is
                      harmful. All error sources were thoroughly studied and the
                      sensitivity limits were calculated. The EDM limit, which can
                      currently be reached on the future experiments, is of the
                      order of 10$^{-25}$ ─ 10$^{-26}$ e·cm. With the present
                      situation at COSY, the accuracy of the precursor experiment
                      is expected to be of the order of 10$^{-19}$ e·cm.},
      cin          = {IKP-4 / IKP-2},
      cid          = {I:(DE-Juel1)IKP-4-20111104 / I:(DE-Juel1)IKP-2-20111104},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF3-612) / 631 -
                      Accelerator R $\&$ D (POF3-631) / srEDM - Search for
                      electric dipole moments using storage rings (694340)},
      pid          = {G:(DE-HGF)POF3-612 / G:(DE-HGF)POF3-631 /
                      G:(EU-Grant)694340},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2017-03791},
      url          = {https://juser.fz-juelich.de/record/834702},
}