| Abstract: | The Pierre Auger Observatory has begun a major Upgrade of its already
impressive capabilities, with an emphasis on improved mass composition
determination using the surface detectors of the Observatory. Known as
AugerPrime, the upgrade will include new 4 m$^2$ plastic scintillator detectors
on top of all 1660 water-Cherenkov detectors, updated and more flexible surface
detector electronics, a large array of buried muon detectors, and an extended
duty cycle for operations of the fluorescence detectors. This Preliminary
Design Report was produced by the Collaboration in April 2015 as an internal
document and information for funding agencies. It outlines the scientific and
technical case for AugerPrime. We now release it to the public via the arXiv
server. We invite you to review the large number of fundamental results already
achieved by the Observatory and our plans for the future. |
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