Validation of the 650 MHZ SRF tuner on the low and high beta cavities for PIP-II at 2 K*

TL;DR

This paper reports on the validation of a 650 MHz superconducting RF tuner system used for both low and high beta cavities in the PIP-II linac, including initial testing results for the beta=0.61 cavities.

Contribution

It presents the first testing results of the 650 MHz SRF tuner system on beta=0.61 cavities, demonstrating its applicability across different cavity types in PIP-II.

Findings

Successful initial testing of the tuner on beta=0.61 cavities

Demonstrated tuner functionality for both cavity types

Validated the tuner system for PIP-II requirements

Abstract

The PIP-II linac will include thirty-six beta=0.61 and twenty-four beta=0.92 650 MHz 5 cell elliptical SRF cavities. Each cavity will be equipped with a tuning system consisting of a double lever slow tuner for coarse frequency tuning and a piezoelectric actuator for fine frequency tuning. The same tuner will be used for both the beta=0.61 and beta=0.92 cavities. Results of testing the cavity-tuner system for the beta=0.61 will be presented for the first time.