First magnet operation on the cryogenic test stand Gersemi at FREIA

TL;DR

The paper reports the first successful operation of a superconducting magnet on the Gersemi cryogenic test stand at FREIA, demonstrating its capabilities for HL-LHC magnet testing at cryogenic temperatures.

Contribution

It presents the first cryogenic operational experiment of Gersemi, showcasing its ability to power superconducting magnets up to 2 kA with safety systems in place.

Findings

Successful powering of a superconducting magnet at cryogenic temperatures

Implementation of quench detection and energy extraction systems

Validation of Gersemi's operational safety protocols

Abstract

The Gersemi cryogenic test bench, installed at FREIA laboratory at Uppsala University, was used for the first time in 2021 to power a superconducting magnet. As part of the HL-LHC program, this cryostat offers an operating temperature between 4.2K and 1.9K. Its satellite equipment such as power converters and the acquisition system allow two superconducting magnet coils to be powered up to 2 kA and provide magnet protection through a robust quench detection and two energy extraction units. This report describes Gersemi's first cryogenic operational experiment and the safety strategy to ensure magnet integrity during operation.