Fabrication experience of the pre-production PIP-II SSR2 cavities at Fermilab

TL;DR

This paper discusses the design, fabrication, and testing experiences of the SSR2 cavities for the PIP-II project at Fermilab, highlighting lessons learned and validation processes.

Contribution

It presents the finalized mechanical design and fabrication experience of the SSR2 cavities, including insights on quality control, interfaces, and development studies.

Findings

Successful fabrication of pre-production SSR2 cavities

Lessons learned in quality control and interface management

Validation tests confirming design robustness

Abstract

The Proton Improvement Plan-II (PIP-II, [1]) linac will include 35 Single Spoke Resonators type 2 (SSR2). A total of eight pre-production SSR2 jacketed cavities will be procured and five installed in the first pre-production cryomodule. The mechanical design of the jacketed cavity has been finalized and it will be presented in this paper along with fabrication and processing experience. The importance of interfaces, quality controls and procurement aspects in the design phase will be remarked as well as lessons learned during the fabrication process. Furthermore, development studies will be presented together with other design validation tests.