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TY - CONF AU - Naranjo, B. AU - Andonian, G. AU - Cavanagh, N. AU - Di Piazza, A. AU - Fukasawa, A. AU - Gerstmayr, E. AU - Holtzapple, R. AU - Keitel, C.H. AU - Majernik, N. AU - Meuren, S. AU - Nielsen, C. AU - Oruganti, M.H. AU - Reis, D.A. AU - Rosenzweig, J.B. AU - Sakai, Y. AU - Sarri, G. AU - Storey, D.W. AU - Williams, O. AU - Yadav, M. AU - Yakimenko, V. ED - Liu, Lin ED - Byrd, John M. ED - Neuenschwander, Regis T. ED - Picoreti, Renan ED - Schaa, Volker R. W. TI - Pair Spectrometer for FACET-II J2 - Proc. of IPAC2021, Campinas, SP, Brazil, 24-28 May 2021 CY - Campinas, SP, Brazil T2 - International Particle Accelerator Conference T3 - 12 LA - english AB - 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. PB - JACoW Publishing CP - Geneva, Switzerland SP - 4336 EP - 4339 KW - electron KW - positron KW - scattering KW - detector KW - photon DA - 2021/08 PY - 2021 SN - 2673-5490 SN - 978-3-95450-214-1 DO - doi:10.18429/JACoW-IPAC2021-THPAB270 UR - https://jacow.org/ipac2021/papers/thpab270.pdf ER -