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Title: A new support structure for high field magnets

Abstract

Pre-stress of superconducting magnets can be applied directly through the magnet yoke structure. We have replaced the collar functionality in our 14 Tesla R and D Nb{sub 3}Sn dipole magnets with an assembly procedure based on an aluminum shell and bladders. Bladders, placed between the coil pack and surrounding yoke inside the shell, are pressurized up to 10 ksi [70 MPa] to create an interference gap. Keys placed into the interference gap replace the bladder functionality. Following the assembly, the bladders are deflated and removed. Strain gauges mounted directly on the shell are used to monitor the stress of the entire magnet structure, thereby providing a high degree of pre-stress control without the need for high tolerances. During assembly, a force of 8.2 x 10{sup 5} lbs/ft [12 MN/m] is generated by the bladders and the stress in the 1.57 inch [40mm] aluminum shell reaches 20.3 ksi [140 MPa]. During cool-down the thermal expansion difference between shell and yoke generates an additional compressive force of 6.85 x 10{sup 5} lbs/ft [10 MN/m], corresponding to a final stress in the shell of 39.2 ksi [270 MPa]. Pre-stress conditions are sufficient for 16 T before the coils separate at the bore. Bladdersmore » have now been used in the assembly and disassembly of two 14 T magnets. This paper describes the magnet structure, assembly procedure and test results.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director, Office of Science. Office of High Energy and Nuclear Physics. Division of High Energy Physics (US)
OSTI Identifier:
795954
Report Number(s):
LBNL-47796; SC-MAG 738
R&D Project: 454001; TRN: US0201358
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Conference
Resource Relation:
Conference: 17 International Conference on Magnet Technology, Geneva (CH), 09/24/2001--09/28/2001; Other Information: PBD: 15 Jun 2001
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM; DIPOLES; MONITORS; STRAINS; SUPERCONDUCTING MAGNETS; THERMAL EXPANSION; NIOBIUM ALLOYS; TIN ALLOYS; SUPPORTS; DESIGN; PERFORMANCE

Citation Formats

Bish, P.S., Caspi, S., Dietderich, D.R., Gourlay, S.A., Hafalia, R.R., Hannaford, R., Lietzke, A.F., Liggins, N., McInturff, A.D., Sabbi, G.L., Scanlan, R.M., O'Neill, J., and Swanson, J.H. A new support structure for high field magnets. United States: N. p., 2001. Web.
Bish, P.S., Caspi, S., Dietderich, D.R., Gourlay, S.A., Hafalia, R.R., Hannaford, R., Lietzke, A.F., Liggins, N., McInturff, A.D., Sabbi, G.L., Scanlan, R.M., O'Neill, J., & Swanson, J.H. A new support structure for high field magnets. United States.
Bish, P.S., Caspi, S., Dietderich, D.R., Gourlay, S.A., Hafalia, R.R., Hannaford, R., Lietzke, A.F., Liggins, N., McInturff, A.D., Sabbi, G.L., Scanlan, R.M., O'Neill, J., and Swanson, J.H. Fri . "A new support structure for high field magnets". United States. https://www.osti.gov/servlets/purl/795954.
@article{osti_795954,
title = {A new support structure for high field magnets},
author = {Bish, P.S. and Caspi, S. and Dietderich, D.R. and Gourlay, S.A. and Hafalia, R.R. and Hannaford, R. and Lietzke, A.F. and Liggins, N. and McInturff, A.D. and Sabbi, G.L. and Scanlan, R.M. and O'Neill, J. and Swanson, J.H},
abstractNote = {Pre-stress of superconducting magnets can be applied directly through the magnet yoke structure. We have replaced the collar functionality in our 14 Tesla R and D Nb{sub 3}Sn dipole magnets with an assembly procedure based on an aluminum shell and bladders. Bladders, placed between the coil pack and surrounding yoke inside the shell, are pressurized up to 10 ksi [70 MPa] to create an interference gap. Keys placed into the interference gap replace the bladder functionality. Following the assembly, the bladders are deflated and removed. Strain gauges mounted directly on the shell are used to monitor the stress of the entire magnet structure, thereby providing a high degree of pre-stress control without the need for high tolerances. During assembly, a force of 8.2 x 10{sup 5} lbs/ft [12 MN/m] is generated by the bladders and the stress in the 1.57 inch [40mm] aluminum shell reaches 20.3 ksi [140 MPa]. During cool-down the thermal expansion difference between shell and yoke generates an additional compressive force of 6.85 x 10{sup 5} lbs/ft [10 MN/m], corresponding to a final stress in the shell of 39.2 ksi [270 MPa]. Pre-stress conditions are sufficient for 16 T before the coils separate at the bore. Bladders have now been used in the assembly and disassembly of two 14 T magnets. This paper describes the magnet structure, assembly procedure and test results.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {6}
}

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