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@PHDTHESIS{Rysov:426017,
      author       = {Rysov, Rustam},
      othercontributors = {Gruebel, Gerhard},
      title        = {{D}evelopment of a compact hard {X}-ray split-and-delay
                      line for studying ultrafast dynamics at free electron laser
                      sources},
      school       = {Universität Hamburg},
      type         = {Dissertation},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2019-03551, DESY-THESIS-2019-023},
      series       = {DESY-THESIS},
      pages        = {140},
      year         = {2019},
      note         = {Dissertation, Universität Hamburg, 2019},
      abstract     = {The study of condensed matter dynamics on ultrafast
                      timescales is one of the key topics in modern material
                      science research. Hard X-ray free-electron laser sources
                      with extreme peak brightness and ultra short pulses provide
                      excellent conditions for studying ultrafast dynamics in the
                      time domain by employing such techniques as X-ray pump-probe
                      spectroscopy or X-ray photon correlation spectroscopy.
                      However, the intrinsic time structure of FEL sources limits
                      the investigated timescales to 0.2 microseconds or slower.
                      One way of overcoming this limitation is split-and-delay
                      technology. This work presents a new concept for a compact
                      hard X-ray split-and-delay device, enabling such experiments
                      at X-ray FEL sources. The device is designed to split a
                      single X-ray pulse into two fractions introducing time
                      delays from -5 to 815 ps. Accessing such timescales allows
                      to push studies of ultrafast dynamics beyond the intrinsic
                      temporal limit of the X-ray source. The split-and-delay unit
                      is based on Bragg optics and modern technologies for
                      mechanics. Having a compact portable design with dimensions
                      of 60x60x30 cm and a weight of about 60 kg allows to install
                      the device in basically any experimental hutch of a FEL
                      source. The split-and-delay line utilizes a combination of
                      various silicon Bragg optics, arranged in various
                      configurations, enabling the operation in the energy range
                      from 7 to 16 keV. The quality of the beam splitting optics
                      is checked by X-ray topography measurements. A novel method
                      for the split-and-delay line alignment and time delay
                      calibration using a infrared laser setup is developed and
                      successfully used. The infrared setup allows a temporal
                      pre-alignment with a precision better than 22 ps without the
                      need for X-rays. The performance of the split-and-delay
                      setup is checked by measuring the throughput and the delay
                      times with the use of Si(111), Si(220) and Si(422) optics at
                      7 keV and 9 keV photon energies. Delay times are measured,
                      ranging from 130 ps to 716 ps. The average uncertainty of
                      measured delay times is 16.2 ps. The results show, that
                      ultrafast pump-probe or XPCS experiments can be carried out
                      with the compact split-and-delay line.},
      cin          = {FS-CXS},
      cid          = {I:(DE-H253)FS-CXS-20130727},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / PHGS, VH-GS-500 - PIER
                      Helmholtz Graduate School $(2015_IFV-VH-GS-500)$},
      pid          = {G:(DE-HGF)POF3-6212 / $G:(DE-HGF)2015_IFV-VH-GS-500$},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2019-03551},
      url          = {https://bib-pubdb1.desy.de/record/426017},
}