The SNS Proton Power Upgrade (PPU) project is to design, build, install and test the equipment necessary to double the accelerator power from 1.4 MW to 2.8 MW and to deliver a 2.0 MW qualified target. PPU also includes the provision for a stub-out in the SNS accumulator ring to target tunnel to facilitate a rapid connection to a new proton beamline for the Second Target Station (STS) project. Doubling of the power will be achieved by increasing the proton beam energy by 30% and peak beam current by 50%, relative to the current accelerator performance. The project also includes modifications to some buildings and services. Costs for acceptance testing, integrated testing, and commissioning through the demonstration of the key performance parameters (KPPs) are included in the PPU scope.
PPU will accomplish the energy upgrade by fabricating and installing new superconducting RF cryomodules, with supporting RF equipment, in the existing linac tunnel and klystron gallery, respectively. The High Voltage Converter Modulators and klystrons for some of the existing installed RF equipment will be upgraded to handle the higher beam current. The target’s ability to handle the increased beam power of 2 MW will be enabled by the addition of a new high-volume gas injection system for pressure pulse mitigation in the mercury target and a redesigned mercury target vessel.
The PPU Project received approval of CD-2 and CD-3 in October 2020. The klystron gallery construction is complete, installation is underway, most of the technical components are under fabrication or received, and the project is >50% complete by cost. Early finish of the project is planned in 2025.
The purpose of this review is to assess project’s status and progress since the CD-2/3 Independent Project Review in July 2020.
