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Title: Mechanical Design of HD2, a 15 T Nb3Sn Dipole Magnet with a 35 mm Bore

Abstract

After the fabrication and test of HD1, a 16 T Nb{sub 3}Sn dipole magnet based on flat racetrack coil configuration, the Superconducting Magnet Program at Lawrence Berkeley National Laboratory (LBNL) is developing the Nb{sub 3}Sn dipole HD2. With a dipole field above 15 T, a 35 mm clear bore, and nominal field harmonics within a fraction of one unit, HD2 represents a further step towards the application of block-type coils to high-field accelerator magnets. The design features tilted racetrack-type ends, to avoid obstructing the beam path, and a 4 mm thick stainless steel tube, to support the coil during the preloading operation. The mechanical structure, similar to the one used for HD1, is based on an external aluminum shell pretensioned with pressurized bladders. Axial rods and stainless steel plates provide longitudinal support to the coil ends during magnet excitation. A 3D finite element analysis has been performed to evaluate stresses and deformations from assembly to excitation, with particular emphasis on conductor displacements due to Lorentz forces. Numerical results are presented and discussed.

Authors:
; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
Accelerator& Fusion Research Division
OSTI Identifier:
943514
Report Number(s):
LBNL-1215E
TRN: US0900415
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
IEEE Transactions on Applied Superconductivity
Additional Journal Information:
Journal Volume: 16; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
75; 43; ACCELERATORS; ALUMINIUM; CONFIGURATION; DESIGN; DIPOLES; EXCITATION; FABRICATION; HARMONICS; LORENTZ FORCE; MAGNETS; MECHANICAL STRUCTURES; PLATES; STAINLESS STEELS; STRESSES; SUPERCONDUCTING MAGNETS

Citation Formats

Ferracin, P, Bartlett, S E, Caspi, S, Dietderich, D R, Gourlay, S A, Hafalia, A R, Hannaford, C R, Lietzke, A F, Mattafirri, S, McInturff, A D, and Sabbi, G L. Mechanical Design of HD2, a 15 T Nb3Sn Dipole Magnet with a 35 mm Bore. United States: N. p., 2006. Web. doi:10.1109/TASC.2006.871323.
Ferracin, P, Bartlett, S E, Caspi, S, Dietderich, D R, Gourlay, S A, Hafalia, A R, Hannaford, C R, Lietzke, A F, Mattafirri, S, McInturff, A D, & Sabbi, G L. Mechanical Design of HD2, a 15 T Nb3Sn Dipole Magnet with a 35 mm Bore. United States. https://doi.org/10.1109/TASC.2006.871323
Ferracin, P, Bartlett, S E, Caspi, S, Dietderich, D R, Gourlay, S A, Hafalia, A R, Hannaford, C R, Lietzke, A F, Mattafirri, S, McInturff, A D, and Sabbi, G L. 2006. "Mechanical Design of HD2, a 15 T Nb3Sn Dipole Magnet with a 35 mm Bore". United States. https://doi.org/10.1109/TASC.2006.871323. https://www.osti.gov/servlets/purl/943514.
@article{osti_943514,
title = {Mechanical Design of HD2, a 15 T Nb3Sn Dipole Magnet with a 35 mm Bore},
author = {Ferracin, P and Bartlett, S E and Caspi, S and Dietderich, D R and Gourlay, S A and Hafalia, A R and Hannaford, C R and Lietzke, A F and Mattafirri, S and McInturff, A D and Sabbi, G L},
abstractNote = {After the fabrication and test of HD1, a 16 T Nb{sub 3}Sn dipole magnet based on flat racetrack coil configuration, the Superconducting Magnet Program at Lawrence Berkeley National Laboratory (LBNL) is developing the Nb{sub 3}Sn dipole HD2. With a dipole field above 15 T, a 35 mm clear bore, and nominal field harmonics within a fraction of one unit, HD2 represents a further step towards the application of block-type coils to high-field accelerator magnets. The design features tilted racetrack-type ends, to avoid obstructing the beam path, and a 4 mm thick stainless steel tube, to support the coil during the preloading operation. The mechanical structure, similar to the one used for HD1, is based on an external aluminum shell pretensioned with pressurized bladders. Axial rods and stainless steel plates provide longitudinal support to the coil ends during magnet excitation. A 3D finite element analysis has been performed to evaluate stresses and deformations from assembly to excitation, with particular emphasis on conductor displacements due to Lorentz forces. Numerical results are presented and discussed.},
doi = {10.1109/TASC.2006.871323},
url = {https://www.osti.gov/biblio/943514}, journal = {IEEE Transactions on Applied Superconductivity},
number = 2,
volume = 16,
place = {United States},
year = {2006},
month = {6}
}