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@PHDTHESIS{Musa:622910,
      author       = {Musa, Elaf Salah Hassan},
      othercontributors = {Hillert, Wolfgang and Agapov, Ilya},
      title        = {{O}ptics measurement and correctionfor future electron
                      circular colliders},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron DESY},
      reportid     = {PUBDB-2025-00559, DESY-THESIS-2025-001},
      series       = {DESY-THESIS},
      pages        = {176},
      year         = {2024},
      note         = {Dissertation, Universität Hamburg, 2024},
      abstract     = {The development of ultra-low emittance storage rings, such
                      as the e+/e- Future CircularCollider (FCC-ee) with a
                      circumference of about 90 km, aims to achieve
                      unprecedentedluminosity and beam size. One significant
                      challenge is correcting the optics, which
                      becomesincreasingly difficult as we target lower emittances.
                      The use of stronger quadrupolesand sextupoles makes these
                      machines particularly sensitive to misalignments, which
                      canseverely impact performance. This study investigates
                      optics correction methods to addressthese challenges. We
                      examined the impact of arc and Interaction Region (IR)
                      magnetalignment errors in two optics design options for the
                      FCC-ee, called Baseline and LocalChromatic Correction Optics
                      (LCCO). To establish realistic alignment tolerances, we
                      developeda sequence of correction steps using the Python
                      Accelerator Toolbox (PyAT) tocorrect the lattice optics,
                      achieve nominal emittance, and large Dynamic Aperture
                      (DA).We focused initially on the Linear Optics from Closed
                      Orbit (LOCO) method, which fitsthe measured Orbit Response
                      Matrix (ORM) to the lattice model to determine
                      optimalparameters such as quadrupole strengths. We
                      implemented a Python-based numerical codefor LOCO correction
                      and evaluated its effectiveness for the FCC-ee. Preliminary
                      resultsindicate successful optics corrections. We also
                      compared LOCO with phase advance +ηx and coupling Resonance
                      Driving Terms (RDTs) + ηy optics correction, finding
                      thatthe latter performed better in achieving design
                      emittance values and a large DA area forrealistic alignment
                      tolerances, for the studied cases. The code was further
                      optimized andexpanded to include more realistic scenarios.
                      Additionally, we applied LOCO to PETRAIV -a fourth
                      generation light source upgrade, and integrated the code
                      into the PythonSimulated Commissioning toolkit for
                      Synchrotrons (PySC).v},
      cin          = {MPY},
      cid          = {I:(DE-H253)MPY-20120731},
      pnm          = {621 - Accelerator Research and Development (POF4-621) /
                      PHGS, VH-GS-500 - PIER Helmholtz Graduate School
                      $(2015_IFV-VH-GS-500)$},
      pid          = {G:(DE-HGF)POF4-621 / $G:(DE-HGF)2015_IFV-VH-GS-500$},
      experiment   = {EXP:(DE-H253)FCC-20190101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:gbv:18-ediss-124512},
      doi          = {10.3204/PUBDB-2025-00559},
      url          = {https://bib-pubdb1.desy.de/record/622910},
}