SRF2025 - 22nd International Conference on RF Superconductivity

Horizontal cryostat testing of the ORNL Spallation Neutron Source (SNS) Proton Power Upgrade (PPU) cryomodules at Jefferson Lab

THP04

25 Sept 2025, 14:30

3h

Ito International Research Center

Board: THP04

Poster Presentation MC1: SRF Facilities Thursday Poster Session

Speaker

Michael McCaughan (Thomas Jefferson National Accelerator Facility)

Description

Oak Ridge National Laboratory (ORNL) is in the process of upgrading its Spallation Neutron Source (SNS) Linear Accelerator in order to double the total machine power from 1.4 to 2.8 MW. This Proton Power Upgrade (PPU) makes use of an added 7 4-cavity cryomodules to its SRF Linac to raise the machine energy to a total 1.3 GeV (with one additional module produced as a ready spare). Jefferson Lab was contacted to produce these modules with vertical testing, manufacturing, and limited horizontal testing of the cryomodules executed at Jefferson Lab and final high-power testing occurring locally at ORNL. This paper will detail ensemble tuner testing results, passbands, and loaded Q results obtained for the 8 modules which have been manufactured.

Funding Agency

Notice: Authored by Jefferson Science Associates, LLC under U.S. DOE Contract No. DE-AC05-06OR23177.