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@INPROCEEDINGS{Bekman:891608,
      author       = {Bekman, Ilja and Hetzel, Jan},
      title        = {{COSY} {O}rbit {C}ontrol {S}tudies},
      reportid     = {FZJ-2021-01619},
      year         = {2020},
      abstract     = {<h4 id="description-of-request">Description of
                      request</h4><p>Orbit control is an essential part of COSY
                      operation. Orbit Correction software (OC) was conceived at
                      IKP and integrated in new EPICS control system in
                      collaboration with Cosylab d.d. and has allowed COSY to
                      deliver required orbit parameters to multiple
                      experiments.</p><p>The performance of the Orbit Correction
                      hinges on several components, such as ring steerer control,
                      steerer calibration, beam position monitoring (BPM) system
                      measurements, BPM calibration, orbit response matrix (ORM)
                      modeling and thus COSY optics modeling and ORM
                      measurement.</p><h4 id="goals">Goals</h4><p>During previous
                      OC operation indications arose pointing to non-optimal
                      steerer calibration, precisely for the SH27 and newer
                      BLW-D1/3 steerers. One goal of this beam time is to check
                      steerer calibrations using the BPM data and test with closed
                      orbit bumps. The integration of corrector magnets of the 2
                      MeV cooler is considered a necessary next step to further
                      improve orbit control.</p><p>A closed orbit correction at
                      injection energy has not yet been performed with the new
                      system. If applied routinely it could improve the injection
                      efficiency and reduce time for machine development. Another
                      goal of this beam time is to characterize the optics model
                      and steerer calibration at injection energy; measure orbit
                      response matrix and compare it to the model; find optimal OC
                      configuration to optimize injection orbit towards higher
                      beam current, and handle injection scenarios e.g. with and
                      without 100keV and 2MeV solenoids active in the
                      optics.</p><p>Matching the model-based and measured ORMs is
                      the final goal of the beam time. Using a selection of
                      energies in the range feasible in COSY a measurement of ORM
                      should be performed and compared to the model-based
                      calculation. Check and optimization of the model would be
                      possible with this data. Tentative selection of momenta are
                      the maximum momentum at 3.0GeV/c, momentum close to the
                      gamma-transition at 2.2GeV/c, momentum used for EDM at
                      0.97GeV/c, momentum used for PANDA target at 0.8GeV/c.
                      Automation of the ORM measurement can be prepared in this
                      step.</p>},
      month         = {Feb},
      date          = {2020-02-03},
      organization  = {11th Meeting of the COSY Beamtime
                       Advisory Committee, Jülich (Germany),
                       3 Feb 2020 - 4 Feb 2020},
      subtyp        = {After Call},
      cin          = {IKP-4},
      cid          = {I:(DE-Juel1)IKP-4-20111104},
      pnm          = {631 - Accelerator R $\&$ D (POF3-631)},
      pid          = {G:(DE-HGF)POF3-631},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/891608},
}