The Pierre Auger Observatory Upgrade - Preliminary Design Report

Understand

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.