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@MASTERSTHESIS{Knobloch:205394,
      author       = {Knobloch, Rente},
      title        = {{B}eam emittance measurement and plasma channel properties
                      in channel-based ion beam transport},
      school       = {TU Darmstadt},
      type         = {Dipl.},
      reportid     = {GSI-2017-00942},
      pages        = {68},
      year         = {2004},
      note         = {TU Darmstadt, Diplomarbeit, 2004},
      abstract     = {The transport of high-current beams a crucial task in
                      heavy-ion-beam-driven inertial fusion. Plasma-channel-based
                      beam transport is a promising final transport concept which
                      has been studied at the Gesellschaft für
                      Schwerionenforschung (GSI) and at the Lawrence Berkeley
                      National Laboratory (LBNL) in recent years.Aspects of ion
                      beam transport in plasma channels are studied with the beam
                      transport experiment at GSI which is described in this work.
                      Its original setup and recent extension of channel length
                      are discussed. In this experiment, plasma channels are
                      formed by a high-voltage discharge in a background gas. Two
                      methods of channel initiation are investigated: ion beam
                      initiation and laser initiation. The latter uses a laser to
                      create favorable conditions for a discharge along the axis;
                      the former uses the ion beam itself.The properties of
                      ion-beam-induced plasma channels in several gases are
                      studied for a wide range of pressure and voltage for the
                      extended channel length of approximately 1 m. A comparison
                      of different background gases shows that high-Z noble gases
                      are more suitable to create channels for beam transport than
                      low-Z noble gases or nitrogen. The mechanism and limits of
                      laser-initiated discharges with the experimental setup
                      available are discussed. The experiment uses the combination
                      of ammonia gas and a CO2 laser. The parameter range of the
                      two initiation methods and their differences are compared.
                      While laser initiation requires a specific combination of
                      laser and gas, ion-beam-induced channels are theoretically
                      possible with any gas.For final beam transport in a
                      heavy-ion-beam-driven fusion reactor, it is important that
                      the beam quality does not decrease during beam transport.
                      The most important measure of beam quality is the beam
                      emittance. Diagnostics to measure the emittance of the ion
                      beam after transport through the plasma channel are
                      described. Systematic errors due to the measurement setup
                      and the diagnostics are discussed. The particular challenge
                      of measuring the emittance of the beam during beam transport
                      is that the measurement has to be made instantaneously, as
                      all measurements which require a longer time interval cannot
                      be used to investigate changes during beam transport. The
                      results demonstrate the feasibility of measuring beam
                      emittance after a transport channel in a single shot with
                      the setup presented and indicate no changes in the beam
                      emittance within statistical errors.},
      cin          = {PPH},
      cid          = {I:(DE-Ds200)PPH-20051214OR027},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)10},
      url          = {https://repository.gsi.de/record/205394},
}