Mechanical Design, Assembly, and Test of LPF1: A 10.2 T Nb3Sn Common-Coil Dipole Magnet With Graded Coil Configuration

An Nb 3 Sn/NbTi subscale dipole magnet named LPF1 with graded coil design and common-coil configuration has been designed, assembled, and tested at the Institute of High Energy Physics, Beijing, China. Compared to the previously proposed FECD1, LPF1 is designed with a longer outer NbTi racetrack coi...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2019-06, Vol.29 (4), p.1-8
Main Authors: Zhang, Kai, Wang, Yingzhe, Wang, Chengtao, Cheng, Da, Kong, Ershuai, Peng, Quanling, Zhang, Zhan, Wei, Shaoqing, Yang, Xiangchen, Xu, Qingjin
Format: Article
Language:English
Subjects:
12 T
accelerator magnets
Aluminum
Assembly
Bladder
Coils
common coil
Configuration management
Configurations
Design
Design parameters
Dipoles
Electron beams
Intermetallic compounds
Lorentz covariance
Magnetomechanical effects
Niobium base alloys
Niobium stannides
Niobium-tin
Safety margins
Strain measurement
Stress
Stress analysis
Super Protron Protron Collider (SPPC)
Superconducting magnets
Windings
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Summary:An Nb 3 Sn/NbTi subscale dipole magnet named LPF1 with graded coil design and common-coil configuration has been designed, assembled, and tested at the Institute of High Energy Physics, Beijing, China. Compared to the previously proposed FECD1, LPF1 is designed with a longer outer NbTi racetrack coil to reduce the peak field in the coil end. The computed bore field and peak coil field of LPF1 is 12.0 T and 12.1 T, if it works at 6100 A with a safety margin of 17% at 4.2 K. The horizontal and vertical directions of the coil packs are preloaded by using bladder and key technology while the axial direction of the coil packs is preloaded by pretightening four aluminum rods. Before assembly, we tested the electron-beam welded bladders in a subscale shell-support structure and verified the strain measurement system. During assembly, we preloaded the coil packs gradually by referring to the measured shell strain after inserting stainless steel keys and removing the bladders. After assembly, we started to test the subscale dipole magnet vertically at 4.2 K. LPF1 reached a bore field of 10.2 T after 13 training quenches and then it reached a stable quench current without detraining. This paper presents the updated design parameters, the stress analysis, the magnet assembly, and test of LPF1.
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2018.2880172