Author: Meuren, S.
Paper Title Page
THPAB270 Pair Spectrometer for FACET-II 4336
 
  • B. Naranjo, G. Andonian, A. Fukasawa, N. Majernik, M.H. Oruganti, J.B. Rosenzweig, Y. Sakai, O. Williams, M. Yadav
    UCLA, Los Angeles, California, USA
  • N. Cavanagh, G. Sarri
    Queen’s University of Belfast, Belfast, Northern Ireland, United Kingdom
  • A. Di Piazza, C.H. Keitel
    MPI-K, Heidelberg, Germany
  • E. Gerstmayr, S. Meuren, D.A. Reis, D.W. Storey, V. Yakimenko
    SLAC, Menlo Park, California, USA
  • R. Holtzapple
    CalPoly, San Luis Obispo, California, USA
  • C. Nielsen
    AU, Aarhus, Denmark
 
  Funding: DARPA GRIT Contract 20204571, DOE HEP Grant DE-SC0009914
We present the design of a pair spectrometer for use at FACET-II, where there is a need for spectroscopy of photons having energies up to 10 GeV. Incoming gammas are converted to high-energy positron-electron pairs, which are then subsequently analyzed in a dipole magnet. These charged particles are then recorded in arrays of acrylic Cherenkov counters, which are significantly less sensitive to background x-rays than scintillator counters in this case. To reconstruct energies of single high-energy photons, the spectrometer has a sensitivity to single positron-electron pairs. Even in this single-photon limit, there is always some low-energy continuum present, so spectral deconvolution is not trivial, for which we demonstrate a maximum likelihood reconstruction. Finally, end-to-end simulations of experimental scenarios, together with anticipated backgrounds, are presented.
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB270  
About • paper received ※ 20 May 2021       paper accepted ※ 28 July 2021       issue date ※ 18 August 2021  
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