SNS Proton Power Upgrade Status

The Proton Power Upgrade (PPU) project at the Oak Ridge Spallation Neutron Source (SNS) aims to double the beam power capability of the accelerator, from 1.4 to 2.8 MW. This will be done by a 30% increase in beam energy (from 1.0 to 1.3 GeV), and a 50% increase in beam current (from 25 to 38 mA averaged over a macropulse). The project is now well underway, after receiving approval to start preliminary design in April 2018. In this paper we will discuss recent technical developments in the project, including the warm linac RF system upgrade, a new topology for the high voltage converter modulators, and recent changes in the accumulator ring project scope.