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@PHDTHESIS{Liancheng:363810,
      author       = {Liancheng, Ji},
      title        = {{HYDRA}-{TPC} {P}rototype - a {T}ime {P}rojection {C}hamber
                      for {L}ight {H}ypernuclei {S}tudy at {R}3{B}, {GSI}/{FAIR}},
      school       = {Technische Universität Darmstadt},
      type         = {Dissertation},
      address      = {Darmstadt},
      publisher    = {Technische Universität Darmstadt},
      reportid     = {GSI-2026-00020},
      pages        = {158 p.},
      year         = {2025},
      note         = {Dissertation, Technische Universität Darmstadt , 2025},
      abstract     = {Hypernuclei offer a unique approach to investigating
                      hyperon-nucleon interactions. However, their extremely short
                      lifetimes, on the order of sub-nanoseconds, pose significant
                      experimental challenges. The HYpernuclei Decay at R³B
                      Apparatus (HYDRA) experiment, designed for operation within
                      the R³B setup at GSI/FAIR, aims to perform heavy-ion
                      collision experiments with the primary objective of
                      performing high-precision invariant mass spectroscopy of
                      light hypernuclei.This thesis presents the development of
                      the HYDRA Time Projection Chamber (TPC) specifically
                      designed for tracking π − produced from hypernuclear
                      decays within the GLAD magnet of the R³B. The TPC
                      incorporates a double-layer wired drift field cage with a
                      drift distance of 300 mm and an active area of 256 × 88
                      mm2. A hybrid amplification stage was implemented,
                      comprising a Gas Electron Multiplier (GEM) and a Micromegas
                      detector. This configuration is expected to achieve an ion
                      back-flow of less than $1\%.The$ design of the field cage
                      was optimized through two-dimensional simulations employing
                      the finite element method and Monte Carlo techniques to
                      ensure a homogeneous drift field. Electron drift
                      displacement was determined to be less than 250 µm at the
                      edge of the active region and less than 200 µm in the
                      central regionof the TPC.The gain performance of the TPC was
                      characterized using an X-ray source. By adjusting the high
                      voltage applied to the electrodes, the influence of varying
                      high voltages in different regions on the overall effective
                      gain of the TPC was quantified.The TPC was successfully
                      commissioned with a front-end readout system incorporating
                      multiplexing boards and digitizing readout electronics based
                      on the GET system. Subsequently, its tracking performance
                      was assessed through measurements of laser tracks generated
                      by a 266-nm ultraviolet laser source and reflected into the
                      drift volume by micromirror bundles, which were integrated
                      within the TPC. A tracking algorithm was developed to
                      reconstruct these laser tracks. Experimental results
                      demonstrated a spatial resolution better than 3 mm in the
                      drift direction, while the pad plane resolution did not meet
                      the desired 200 µm requirement.Finally, the influence of
                      magnetic fields on the drift electron trajectories was
                      investigated within the GLAD magnet at magnetic field
                      strengths ranging from 0 to 0.92 T.},
      cin          = {R3B@FAIR / KRA},
      cid          = {I:(DE-Ds200)Coll-FAIR-R3B / I:(DE-Ds200)KRA-20150901OR349},
      pnm          = {612 - Cosmic Matter in the Laboratory (POF4-612)},
      pid          = {G:(DE-HGF)POF4-612},
      experiment   = {$EXP:(DE-Ds200)Experiment_without_proposal_number-20200803$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:tuda-tuprints-298850},
      url          = {https://repository.gsi.de/record/363810},
}