What question did this study set out to answer?

This research aims to report on the advancements made to safely increase beam current to 500 mA at NSLS-II.

February 2, 2026Open Access

Advancing to 500 mA: High-current ramp-up and operational experience at NSLS-II

Key Points

This research aims to report on the advancements made to safely increase beam current to 500 mA at NSLS-II.
Increased beam current from 50 mA to 500 mA since 2014.
Implemented 600 new temperature sensors for better monitoring.
Optimized RF spring installation to improve performance.
Installed a superconducting wiggler to reduce vacuum heating.
Conducted extensive beam studies to ensure signal stability across 29 beamlines.
Successfully operated at 500 mA in August 2023.
Maintained vacuum temperatures below 70°C at 500 mA.
Improved signal intensity and signal-to-noise ratio for experiments.
Boosted sample throughput across multiple beamlines.

Abstract

Since the first light in 2014 at 50 mA, NSLS-II has steadily increased beam current, reaching 500 mA in October 2019. Along the way, various challenges were addressed, including RF power consumption, wakefield effects, and unexpected component heating. Key improvements included enhanced temperature monitoring with 600 new sensors, optimized RF spring installation, and the installation of a superconducting wiggler in 2022 to reduce vacuum heating further. As a result, vacuum temperatures now remain below 70°C at 500 mA. Extensive beam studies ensured stability for 29 beamlines, improving signal intensity, signal-to-noise ratio, and sample throughput. NSLS-II successfully operated at 500 mA in August 2023, with increasing high-current operational periods scheduled each year to enhance user experiments.

Advancing to 500 mA: High-current ramp-up and operational experience at NSLS-II

Key Points

Abstract

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