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@PHDTHESIS{Kroh:597520,
      author       = {Kroh, Tobias},
      othercontributors = {Kärtner, Franz and Matlis, Nicholas},
      title        = {{A} compact {TH}z-driven electron gun},
      school       = {University of Hamburg},
      type         = {Dissertation},
      reportid     = {PUBDB-2023-06617},
      pages        = {278},
      year         = {2023},
      note         = {AUF DIESE THESIS IST DURCH MEINEN SUPERVISOR PROF. KÄRTNER
                      EIN EMBARGO VON 1 JAHR GESETZT. BITTE DESHALB ERST NACH
                      ABLAUF VON 1 JAHR NACH VERTEIDIGUNG (10.08.2024)
                      VERÖFFENTLICHEN!!! Vielen Dank und viele liebe
                      Grüße,Tobias Kroh; Dissertation, University of Hamburg,
                      2023},
      abstract     = {Novel all-optical terahertz (THz)-based accelerators
                      promise to enable new science by providing ultrafast and
                      bright electron bunches at a small footprint. While
                      practical prototypes of THz-based devices have been
                      demonstrated and have shown exceptional capabilities to
                      accelerate and manipulate electron beams on sub-ps
                      timescales, the development of practical THz-driven
                      photoguns has lagged behind due to challenges associated
                      with physical miniaturization and the high THz pulse energy
                      required. This thesis significantly advances the development
                      of such THz-driven guns by setting a dual focus: First,
                      systematic parameter scans are performed on tilted
                      pulse-front setups providing crucial insights into the
                      non-collinear interactionlengths, parameter sensitivities
                      and physics inherent to high-energy THz generation. In
                      addition, spatio-temporal manipulation of the pump pulse is
                      explored both experimentally and by simulations and found as
                      viable tool to scale tilted pulse-front based THz sources to
                      such energies required for the next generation of compact
                      particle accelerators. Application of the findings resulted
                      in robust extraction of THz pulses with energies up to 400
                      μJ while operating well below the optical damage threshold.
                      Secondly, these setups are used in in three different
                      experiments aimed at developing a practical compact
                      THz-driven gun. The extraction of multi-keV electrons from a
                      triggerable THz photogun is demonstrated for the first time,
                      and the parameter space and resulting performance are
                      explored. Subsequently, multi-layered structures are
                      developed that extend the interaction between electrons and
                      THz pulses. A novel single-sided pumped THz accelerator is
                      tested and a segmented dual-sided pumped THz photogun is
                      developed. Finally, the instrumentation for commissioning
                      and scaling THz driven gun technology to energies beyond 100
                      keV, comparable to the performance of modern compact DC
                      electron guns, is presented and discussed. This work
                      represents a critical step in the development of practical
                      all optical THzdriven electron guns and paves the way
                      towards more compact accelerators with fs bunch durations,
                      low emittance and orders of magnitude higher brightness to
                      power future ultrafast electron diffraction experiments and
                      compact X-ray sources.},
      cin          = {FS-CFEL-2 / CFEL-UFOX},
      cid          = {I:(DE-H253)FS-CFEL-2-20120731 /
                      I:(DE-H253)CFEL-UFOX-20160927},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / DFG project 390715994 - EXC 2056: CUI: Advanced
                      Imaging of Matter (390715994) / AXSIS - Frontiers in
                      Attosecond X-ray Science: Imaging and Spectroscopy (609920)},
      pid          = {G:(DE-HGF)POF4-631 / G:(GEPRIS)390715994 /
                      G:(EU-Grant)609920},
      experiment   = {EXP:(DE-H253)AXSIS-20200101 /
                      EXP:(DE-H253)CFEL-Exp-20150101},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2023-06617},
      url          = {https://bib-pubdb1.desy.de/record/597520},
}