Quench Behavior of 18-mm-Period, 1.1-m-Long Nb₃Sn Undulator Magnets

Journal Article · Tue Jan 23 00:00:00 EST 2024 · IEEE Transactions on Applied Superconductivity

DOI:https://doi.org/10.1109/tasc.2024.3350606· OSTI ID:2349033

Kesgin, I. ^[1]; MacDonald, S. ^[1]; Kasa, M. ^[1]; Fuerst, J. ^[1]; Ivanyushenkov, Y. ^[1]; Barzi, E. ^[2]; Turrioni, D. ^[2]; Zlobin, A. V. ^[2]; Gluskin, E. ^[1]

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1. Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
2. Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

A novel Nb ₃ Sn-based superconducting undulator (SCU) was developed and integrated into the Advanced Photon Source (APS) at Argonne National Laboratory. The SCU achieved user operation within an accelerator environment. Compared to its Nb-Ti counterpart, the Nb ₃ Sn SCU operates at substantially higher currents. Thus, a detailed experimental evaluation of the SCU magnets’ performance was necessary under both “wet” and indirectly cooled conditions to ensure its reliability during operation. Here our study indicated that the cooling method has a noticeable influence on the magnet's behavior. Specifically, energy dissipation in the magnets during quenches was observed to be greater under indirect cooling than with “wet” cooling. This investigation provided insights into the safe operational limits. Guided by these insights the more challenging high-current tests were successfully carried out at the end of the user phase. The SCU achieved the design undulator field of 1.17 T at 820 A and 4.2 K, with a magnetic gap of 9.5 mm and a period of 18 mm. Actual performance exceeded the specifications, reaching 850 A.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States); Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• Grant/Contract Number: AC02-06CH11357; AC02-07CH11359
• OSTI ID: 2349033
• Report Number(s): FERMILAB-PUB--24-0114-TD; oai:inspirehep.net:2769347
• Journal Information: IEEE Transactions on Applied Superconductivity, Journal Name: IEEE Transactions on Applied Superconductivity Journal Issue: 5 Vol. 34; ISSN 1051-8223
• Publisher: IEEE
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
Nb3Sn
SCU
dissipations
losses
magnet design
quench back
quench energy
stability
superconducting undulator