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@ARTICLE{Brand:1054334,
      author       = {Brand, P. and Bonaventura, D. and Eick, H. and Gebel, R.
                      and Goldenbaum, F. and Hejny, V. and Hetzel, J. and
                      Kamerdzhiev, V. and Mannweiler, C. and Prasuhn, Dieter and
                      Ritman, J. and Shurkhno, Nikolay and Stassen, R. and
                      Stockhorst, H. and Vestrick, S. and Weide, M. and Khoukaz,
                      A.},
      title        = {{O}peration of the {PANDA} cluster-jet target with the
                      {HESR} stochastic cooling at {COSY}},
      journal      = {Physical review accelerators and beams},
      volume       = {29},
      number       = {2},
      issn         = {2469-9888},
      address      = {College Park, MD},
      publisher    = {American Physical Society},
      reportid     = {FZJ-2026-01788},
      pages        = {023001},
      year         = {2026},
      abstract     = {The P⁢ANDA experiment at the High Energy Storage Ring
                      (HESR) of the Facility for Antiproton and Ion Research
                      (FAIR) in Darmstadt, Germany, will be a unique setup to
                      study the strong interaction in antiproton-proton
                      collisions. The combination of a windowless cluster-jet
                      target and a high-intensity antiproton beam, cooled by
                      stochastic cooling down to momentum spreads of
                      $4×10^−5in$ the presence of the target, is ideal to
                      study, e.g., the line shape of exotic candidates in the
                      charmonium spectrum, such as the 𝜒𝑐⁢1⁡(3872). For
                      first studies on the performance of the cluster-jet target
                      and the stochastic cooling, both were installed at the
                      COoler SYnchrotron (COSY) at the Forschungszentrum Jülich,
                      Germany. Detailed studies on the beam quality for different
                      target settings with different densities were performed and
                      will be presented in this paper. The results show that the
                      cluster-jet target is able to provide the required hydrogen
                      target thickness of more than 2 $×10^15  atoms/cm2$ for
                      the PANDA experiment and that the stochastic cooling is able
                      to efficiently cool the beam in presence of such a target
                      thickness, although the system is not yet complete compared
                      to the setup foreseen for the HESR. The presented results
                      strengthen the theoretical understanding of the beam-target
                      interaction and stochastic cooling performance and will
                      provide important input for operation later at the HESR.},
      cin          = {IKP-1 / IKP-2 / IKP-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IKP-1-20111104 / I:(DE-Juel1)IKP-2-20111104 /
                      I:(DE-Juel1)IKP-4-20111104},
      pnm          = {613 - Matter and Radiation from the Universe (POF4-613) /
                      621 - Accelerator Research and Development (POF4-621)},
      pid          = {G:(DE-HGF)POF4-613 / G:(DE-HGF)POF4-621},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/3g6s-qm12},
      url          = {https://juser.fz-juelich.de/record/1054334},
}