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@PHDTHESIS{Wunstorf:153817,
      author       = {Wunstorf, Renate},
      title        = {{S}ystematische {U}ntersuchungen zur {S}trahlenresistenz
                      von {S}ilizium-{D}etektoren für die {V}erwendung in
                      {H}ochenergiephysik-{E}xperimenten},
      school       = {University of Hamburg},
      type         = {Dr.},
      address      = {Hamburg},
      reportid     = {DESY-2013-00725},
      year         = {1992},
      note         = {Notional starting date. The scanned file is too big to be
                      uploaded; University of Hamburg, Diss., 1992},
      abstract     = {The very intense radiation fields connected with the high
                      energy and the high luminosityof future colliding beam
                      machines (LHC, SSC) make the radiation hardness of all
                      detectorcomponents an urgent requirement. In this thesis the
                      radiation hardness of silicondetectors in high energy
                      physics experiments was investigated systematically. Because
                      ofthe mixed radiation field the particle and energy
                      dependence were especially studied withmonoenergetic
                      particles. These data show that the bulk damage corresponds
                      independentlyof the particle type to the damage functions of
                      the non ionizing energy loss, if theenergy of the energy of
                      the primary knock-on atom is above a threshold value. In
                      mostapplications the damage effects are dominated by the
                      neutron induced bulk damage, andthe damage efficiency of the
                      expected neutron spectrum corresponds to that of 1
                      MeVneutrons. Accordingly the damage functions were used for
                      the normalization of differentradiation fields to 1MeV
                      neutrons. With respect to the detector performance
                      detailedmeasurements of the change in the effective donor
                      concentration, the leakage current increaseand charge
                      collection deficiency were investigated as function of the
                      particle fluenceand the time after irradiation. Special
                      emphasis was put on the self annealing effects atroom
                      temperature in order to separate the respective damage
                      generation and its subsequentself annealing. The change in
                      the effective donor concentration is caused by donorand
                      acceptor removal and radiation induced acceptor like
                      centers. For n-type silicon thisleads to the conversion to
                      p-type material, which was here, for the first time, proved
                      withshort ranged a-particles. Also a modification of defects
                      was observed during the long termself annealing leading to a
                      further creation of acceptor like centers. The radiation
                      inducedleakage current depends on the conduction type.
                      Taking the self annealing into accountthe current increase
                      in long term exposure is governed by a damage rate of
                      4.10-17 Acm-1•The charge collection efficiency for mip's
                      was calculated from the electron and hole trapping,which was
                      studied separately. The analysed results were discussed with
                      respect toa long term behaviour in the intense radiation
                      field of a high energy physics experiment.Based on the
                      present results this discussion indicates that the radiation
                      hardness of silicondetectors is sufficiently high to ensure
                      operability for applications presently considered forfuture
                      colliding beam machines.},
      keywords     = {Dissertation (GND)},
      cin          = {H1},
      cid          = {I:(DE-H253)H1-20120806},
      pnm          = {Experiments at HERA (H1) (POF2-511)},
      pid          = {G:(DE-H253)POF2-HERA-Exp.-(H1)-20130405},
      experiment   = {EXP:(DE-588)4443767-5},
      typ          = {PUB:(DE-HGF)11},
      url          = {https://bib-pubdb1.desy.de/record/153817},
}