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@PHDTHESIS{Yildirim:317686,
      author       = {Yildirim, Eda},
      othercontributors = {Gregor, Ingrid-Maria and Tackmann, Kerstin},
      title        = {{C}ollected {C}harge and {L}orentz {A}ngle {M}easurement on
                      {N}on-irradiated and {I}rradiated {ATLAS} {S}ilicon
                      {M}icro-{S}trip {S}ensors for the {HL}-{LHC}},
      school       = {Universität Hamburg},
      type         = {Dr.},
      address      = {Hamburg},
      publisher    = {Verlag Deutsches Elektronen-Synchrotron},
      reportid     = {PUBDB-2017-00842, DESY-THESIS-2017-005},
      series       = {DESY-THESIS},
      pages        = {125},
      year         = {2017},
      note         = {Universität Hamburg, Diss., 2016},
      abstract     = {In this thesis, the collected charge and the Lorentz angle
                      on non-irradiated and the irradiatedminiature of the current
                      test silicon micro-strip sensors (ATLAS12) of the future
                      ATLAS innertracker are measured. The samples are irradiated
                      up to 51015 1MeV neq=cm2 and some of themalso measured after
                      short-term annealing (80 min at 60 C). The measurements are
                      performedat the DESY II test beam, which provides the
                      advantage of tracking to suppress noise hits.The collected
                      charge is measured at various bias voltages for each sample.
                      The results arecompared with the measurements performed
                      using a Sr90 radioactive source. It is shown thatthe
                      measurements with beam and radioactive source are consistent
                      with each other, and theadvantage of tracking at the beam
                      measurements provides the measurement of collected chargeon
                      highly irradiated sensors at lower bias voltages.The Lorentz
                      angle is measured for each sample at dierent magnetic eld
                      strengths between0T and 1 T, the results are extrapolated to
                      2 T, which is the magnetic eld in the inner trackerof the
                      ATLAS detector. Most of the measurements are performed at
                      --500V bias voltage,which is the planned operation bias
                      voltage of the future strip tracker. Some samples are
                      alsomeasured at dierent bias voltages to observe the eect of
                      bias voltage on the Lorentz angle. Thesignal reconstruction
                      of the strip sensors are performed using the lowest possible
                      signal-to-noisethresholds. For non-irradiated samples, the
                      measured Lorentz angle agrees with the prediction ofthe BFK
                      model. On the irradiated samples, the results suggest that
                      the Lorentz angle decreaseswith increasing bias voltage due
                      to the increasing electric eld in the sensor. The Lorentz
                      angledecreases with increasing irradiation level; however,
                      if the sample is under-depleted, the eectof electric eld
                      dominates and the Lorentz angle increases. Once the
                      irradiation level becomestoo high, hence the collected
                      charge is small due to increasing trapping, the visible eect
                      ofthe Lorentz force in the detector decreases, therefore the
                      measured Lorentz angle decreases.Short-term annealing
                      increases the Lorentz angle, due to the decrease in full
                      depletion voltage.However, on the highly irradiated samples
                      the annealing further decreases the Lorentz angle.The
                      analysis is also re-performed using the signal threshold
                      that will be used in the digitalreadout of strip sensors at
                      the future ATLAS inner tracker. It is seen that the visible
                      eect ofthe Lorentz force decreases at lower uences due to
                      the higher threshold.},
      cin          = {ATLAS},
      cid          = {I:(DE-H253)ATLAS-20120731},
      pnm          = {632 - Detector technology and systems (POF3-632)},
      pid          = {G:(DE-HGF)POF3-632},
      experiment   = {EXP:(DE-H253)TestBeamline24-20150101 /
                      EXP:(DE-H253)LHC-Exp-ATLAS-20150101},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)29 / PUB:(DE-HGF)11},
      doi          = {10.3204/PUBDB-2017-00842},
      url          = {https://bib-pubdb1.desy.de/record/317686},
}