RFQ-Mod1 Preliminary Design Review
The Proton Power Upgrade (PPU) Project is critical to keep Spallation Neutron Source (SNS) at the international forefront and ensure continued leadership by maximizing the neutron flux available at the First Target Station (FTS) and providing the capability to drive a Second Target Station (STS). The PPU will upgrade the SNS Accelerator Complex to double its current proton beam power capability from 1.4 to 2.8 MW. The 2 MW delivered to the FTS will improve performance across the entire existing and future instrument suite, and the future STS would provide a wholly new capability in the form of a transformative new source optimized to produce the world’s highest peak brightness of cold neutrons.
Provisions for an accelerator power increase were made in the original SNS project, and these are being leveraged to provide a cost-effective means of doubling the beam power. Additionally, accelerator developments and operational experience over the last 10 years of operation provide a strong technical basis for much of the design. The plan for doubling the proton beam intensity capability per pulse is to increase the beam energy from 1.0 to 1.3 GeV and increase the average linear accelerator (linac) beam current from 26 to 38 mA.
The increase in beam current, along with a requirement to operate with a 25 % power margin for the high power RF system, necessitates the upgrade of the power modulator which provides the high voltage pulses to the first three klystrons in the linac. The purpose of this RFQ-Mod1 Preliminary Design Review is to determine that the upgraded modulator is at or above the 30-50 percent design completion level.