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Status and first results from FACET-II towards the demonstration of plasma wakefield acceleration, coherent radiation generation, and probing strong-field QED

Storey, D; Adli, E; Allen, J; Alsberg, L; Ariniello, R; Berman, L; Bucksbaum, P; Cao, J; Clarke, C; Corde, S; et al (September 2023, Journals of Accelerator Conferences Website (JACoW))

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Pair Spectrometer for FACET-II

https://doi.org/10.18429/JACoW-IPAC2021-THPAB270

Naranjo, B.; Andonian, G.; Cavanagh, N.; Di Piazza, A.; Fukasawa, A.; Gerstmayr, E.; Holtzapple, R.; Keitel, C.; Majernik, N.; Meuren, S.; et al (August 2021, IPAC)

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.
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Venom Complexity in a Pitviper Produced by Facultative Parthenogenesis

https://doi.org/10.1038/s41598-018-29791-y

Calvete, J. J.; Casewell, N. R.; Hernández-Guzmán, U.; Quesada-Bernat, S.; Sanz, L.; Rokyta, D. R.; Storey, D.; Albulescu, L.-O.; Wüster, W.; Smith, C. F.; et al (December 2018, Scientific Reports)

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