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@INPROCEEDINGS{Hempelmann:835923,
      author       = {Hempelmann, Nils},
      title        = {{A}n {A}ctive {S}pin {T}une {F}eedback {S}ystem for the
                      {C}ooler {S}ynchrotron ({COSY})},
      school       = {RWTH Aachen},
      reportid     = {FZJ-2017-05055},
      year         = {2017},
      abstract     = {The Jülich Electric Dipole Moment Investigation (JEDI)
                      Collaboration works on a measurement of the electric dipole
                      moment (EDM) of charged hadrons using a storage ring. Such a
                      dipole moment would violate CP symmetry, providing a test
                      for physics beyond the Standard Model. To measure the EDM in
                      a magnetic storage ring, the precession of the spin in the
                      ring has to be kept in phase with an RF Wien Filter that
                      manipulates the spin. In fall 2015 an active feedback system
                      that meets this requirement was successfully tested at COSY.
                      The system works by adjusting the accelerator frequency,
                      which changes the beam velocity and therefore the rate of
                      spin precession. Data from the polarimeter EDDA are analyzed
                      over a period of about one second to determine the relative
                      phase between the spin precession and the external
                      frequency, which is used to calculate the necessary
                      correction. In absence of a Wien filter an RF solenoid coil
                      was used as a spin manipluator in the tests. The test of the
                      feedback system proofs that the method is suitable for a
                      proof of principle experiment for EDM measurements at COSY.},
      month         = {Mar},
      date          = {2017-03-19},
      organization  = {DPG Frühjahrstagung Hadronen und
                       Kerne, Dresden (Germany), 19 Mar 2017 -
                       24 Mar 2017},
      subtyp        = {Other},
      cin          = {IKP-2},
      cid          = {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},
      experiment   = {EXP:(DE-Juel1)JEDI-20170712},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/835923},
}