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To summarize the refurbishment of RF stations at the APS linac and its impact on performance.

February 2, 2026Open Access

The APS linac RF station upgrading status

Key Points

To summarize the refurbishment of RF stations at the APS linac and its impact on performance.
Upgraded two of five RF stations with solid-state modulators and klystrons.
Implemented new digital low-level RF systems for enhanced operation.
Conducted performance evaluations post-upgrade.
Significant improvements in the quality of electron beams produced.
Enhanced reliability of the APS linac for future operations.

Abstract

The Advanced Photon Source (APS) linac has reliably delivered high-quality electron beams for over 30 years. To support the APS Upgrade and ensure continued operation, a major refurbishment is underway. As part of this project, two of the linac's five operating radio frequency (RF) stations have been upgraded with solid-state modulator-powered klystrons and new digital low-level radio frequency (LLRF) systems. This upgrade has notably improved the linac's performance. This paper summarizes these improvements and outlines our next plans.

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