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Title: Assembly and Test of HD2, a 36 mm bore high field Nb3Sn Dipole Magnet

Abstract

We report on the fabrication, assembly, and test of the Nb{sub 3}Sn dipole magnet HD2. The magnet, aimed at demonstrating the application of Nb{sub 3}Sn superconductor in high field accelerator-type dipoles, features a 36 mm clear bore surrounded by block-type coils with tilted ends. The coil design is optimized to minimize geometric harmonics in the aperture and the magnetic peak field on the conductor in the coil ends. The target bore field of 15 T at 4.3 K is consistent with critical current measurements of extracted strands. The coils are horizontally pre-stressed during assembly using an external aluminum shell pre-tensioned with water-pressurized bladders. Axial pre-loading of the coil ends is accomplished through two end plates and four aluminum tension rods. The strain in coil, shell, and rods is monitored with strain gauges during assembly, cool-down and magnet excitation, and compared with 3D finite element computations. Magnet's training performance, quench locations, and ramp-rate dependence are then analyzed and discussed.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Accelerator& Fusion Research Division
OSTI Identifier:
971556
Report Number(s):
LBNL-2348E
TRN: US1001225
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Applied Superconductivity
Additional Journal Information:
Journal Volume: 19; Journal Issue: 3; Related Information: Journal Publication Date: June 2009
Country of Publication:
United States
Language:
English
Subject:
75; 43; ALUMINIUM; APERTURES; CRITICAL CURRENT; DESIGN; DIPOLES; EXCITATION; FABRICATION; HARMONICS; MAGNETS; PERFORMANCE; PLATES; STRAINS; SUPERCONDUCTORS; TARGETS; TRAINING

Citation Formats

Ferracin, P, Bingham, B, Caspi, S, Cheng, D. W,., Dietderich, D R, Felice, H, Godeke, A, Hafalia, A R, Hannaford, C R, Joseph, J, Lietzke, A F, Lizarazo, J, Sabbi, G, Trillaud, F, and Wang, X. Assembly and Test of HD2, a 36 mm bore high field Nb3Sn Dipole Magnet. United States: N. p., 2008. Web.
Ferracin, P, Bingham, B, Caspi, S, Cheng, D. W,., Dietderich, D R, Felice, H, Godeke, A, Hafalia, A R, Hannaford, C R, Joseph, J, Lietzke, A F, Lizarazo, J, Sabbi, G, Trillaud, F, & Wang, X. Assembly and Test of HD2, a 36 mm bore high field Nb3Sn Dipole Magnet. United States.
Ferracin, P, Bingham, B, Caspi, S, Cheng, D. W,., Dietderich, D R, Felice, H, Godeke, A, Hafalia, A R, Hannaford, C R, Joseph, J, Lietzke, A F, Lizarazo, J, Sabbi, G, Trillaud, F, and Wang, X. 2008. "Assembly and Test of HD2, a 36 mm bore high field Nb3Sn Dipole Magnet". United States. https://www.osti.gov/servlets/purl/971556.
@article{osti_971556,
title = {Assembly and Test of HD2, a 36 mm bore high field Nb3Sn Dipole Magnet},
author = {Ferracin, P and Bingham, B and Caspi, S and Cheng, D. W,. and Dietderich, D R and Felice, H and Godeke, A and Hafalia, A R and Hannaford, C R and Joseph, J and Lietzke, A F and Lizarazo, J and Sabbi, G and Trillaud, F and Wang, X},
abstractNote = {We report on the fabrication, assembly, and test of the Nb{sub 3}Sn dipole magnet HD2. The magnet, aimed at demonstrating the application of Nb{sub 3}Sn superconductor in high field accelerator-type dipoles, features a 36 mm clear bore surrounded by block-type coils with tilted ends. The coil design is optimized to minimize geometric harmonics in the aperture and the magnetic peak field on the conductor in the coil ends. The target bore field of 15 T at 4.3 K is consistent with critical current measurements of extracted strands. The coils are horizontally pre-stressed during assembly using an external aluminum shell pre-tensioned with water-pressurized bladders. Axial pre-loading of the coil ends is accomplished through two end plates and four aluminum tension rods. The strain in coil, shell, and rods is monitored with strain gauges during assembly, cool-down and magnet excitation, and compared with 3D finite element computations. Magnet's training performance, quench locations, and ramp-rate dependence are then analyzed and discussed.},
doi = {},
url = {https://www.osti.gov/biblio/971556}, journal = {IEEE Transactions on Applied Superconductivity},
number = 3,
volume = 19,
place = {United States},
year = {2008},
month = {8}
}