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@PHDTHESIS{Golz:418556,
      author       = {Golz, Torsten},
      othercontributors = {Stojanovic, Nikola and Wurth, Wilfried},
      title        = {{H}igh repetition rate {TH}z characterization at 4th
                      generation {X}-{R}ay light sources},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2019-00540, DESY-THESIS-2019-001},
      series       = {DESY-THESIS},
      pages        = {266},
      year         = {2019},
      note         = {Dissertation, Universität Hamburg, 2018},
      abstract     = {Within this work a wholesome approach to the
                      characterization of FEL based THz radiationis made on the
                      example of the THz radiation provided at the THz beamline at
                      Flash thefree electron laser at DESY in Hamburg. A SRW based
                      model of the THz generation froma free electron and the
                      corresponding transport is developed and used to gain
                      insight intothe complex intensity profile created by the
                      interplay of the THz undulator and variousmagnetic edges. An
                      accurate model of the THz beamline is established that
                      allows theprecise manipulation of beam size and divergence
                      for subsequent experiments. Based on theagreement with
                      measurements a complete beam transport model for the helical
                      THz undulator,planned at Flash2 is developed. Furthermore a
                      THz pulse characterization systemfor high pulse energy high
                      spectral brightness and high pulse energy high bandwidth
                      THzpulses from a free electron laser is developed, set up
                      and thoroughly tested. Based on thelinear electro-optical
                      effect the system achieves a broad detection range at few
                      femtosecondtime resolution by the interplay of two
                      electro-optical detection setups. The first
                      realizingbroadband detection in a scanning electro-optical
                      sampling fashion and the second allowingfor a single shot
                      arrival time correction tackling the problem of
                      synchronizing external lightsources to large scale
                      accelerators. The system permits the characterization of the
                      electricfield of the THz pulses available at the THz
                      beamline at FLASH at a repetition rate of200 kHz. With the
                      photon efficient design and easy scale-ability the system is
                      suited as ablueprint for other high repetition rate
                      accelerators implementing FEL based THz sources.Lastly the
                      experimental capabilities of the developed system are proven
                      by a model experimentutilizing Strontiumtitanate, perovskite
                      type transition metal oxide. Indications of anultrafast
                      phase change are found and a possibly mechanism is proposed
                      and discussed basedon a series of experiments under varying
                      excitation parameters.},
      cin          = {FF / DOOR},
      cid          = {I:(DE-H253)FF-20130831 / I:(DE-H253)HAS-User-20120731},
      pnm          = {6G2 - FLASH (POF3-622)},
      pid          = {G:(DE-HGF)POF3-6G2},
      experiment   = {EXP:(DE-H253)F-ThzBL-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)29 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2019-00540},
      url          = {https://bib-pubdb1.desy.de/record/418556},
}