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@PHDTHESIS{Reuter:218418,
      author       = {Reuter, Maria},
      title        = {{C}haracterisation of a laser wakefield accelerator with
                      ultra-short probe pulses},
      school       = {Friedrich-Schiller-Universität Jena},
      type         = {Dissertation},
      address      = {Jena},
      publisher    = {db-Thüringen},
      reportid     = {GSI-2019-00396},
      pages        = {137 S.},
      year         = {2019},
      note         = {Dissertation, Friedrich-Schiller-Universität Jena , 2018},
      abstract     = {Within the frame of this thesis, aspects of the
                      acceleration of electrons with high-intensitylaser pulses
                      inside an underdense plasma were investigated. The basic
                      acceleration mecha-nism, which is referred to as laser
                      wakefield acceleration relies on the generation of a
                      plasmawave by an intense laser pulse. Since the plasma wave
                      co-propagates with the laser pulse,its longitudinally
                      alternating electric field moves with a velocity close to
                      the speed of lightand electrons trapped in the accelerating
                      phase of the wave can be accelerated to
                      relativisticenergies. While basic principles such as the
                      generation of a plasma wave, the injection ofelectrons into
                      the accelerating phase of the wave and limitsto the
                      acceleration process areknown, the exact processes occurring
                      during the nonlinear interaction of laser pulse andplasma
                      wave still need to be explored in more detail. The
                      consequence of those nonlinearprocesses is a drastic change
                      of the electron parameters – e.g. final electron energy,
                      band-width and pointing – through slight changes in the
                      initial conditions. In this context, theposition in the
                      plasma at which electrons are injected into the plasma wave
                      plays a key rolefor the maximum achievable electron energy.
                      Therefore, theinjection of electrons at a de-fined position
                      is a possibility to reduce shot-to-shot fluctuations and
                      might make the electronpulses applicable, e.g. as a stable
                      source of secondary radiation for temporally and
                      spatiallyhighly resolving imaging techniques. The
                      investigation ofcontrolled injection of electrons atan
                      electron density transition demonstrated a correlationof
                      electron pulse parameters suchas electron energy gain and
                      accelerated charge to the properties of the transition, and
                      thus,might be a promising method to generate custom designed
                      electron pulses. Nevertheless,shot-to-shot fluctuations in
                      the electron parameters were still observed and are most
                      likelycaused by the nonlinear evolution of the laser pulse
                      inside the plasma. To further reduceinstabilities, deeper
                      insight into these nonlinear processes is required and
                      hence, a methodto observe the plasma wave and the laser
                      pulse. Combining an ultra short probe pulse witha highly
                      resolving imaging system as successfully implemented at the
                      institute of Optics andQuantumelectronics in Jena, more
                      light can be shed on these processes, which take placeon
                      femtosecond and micrometer scales. With that system,
                      characteristics of the magneticfields inextricably connected
                      to the acceleration process could be studied in
                      unprecedenteddetail. This deeper insight allowed to observe
                      signatures of the magnetic field of the drivinglaser pulse
                      for the first time, which paves the way for the indirect
                      observation of the mainlaser pulse during the interaction.},
      cin          = {HIJ},
      cid          = {I:(DE-Ds200)HIJ-20110223OR115},
      pnm          = {6211 - Extreme States of Matter: From Cold Ions to Hot
                      Plasmas (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6211},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:gbv:27-dbt-20190116-1451534 },
      urn          = {urn:nbn:de:gbv:27-dbt-20190116-1451534},
      url          = {https://repository.gsi.de/record/218418},
}