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Title: Test Results of HD1b, an upgraded 16 Tesla Nb3Sn DipoleMagnet

Abstract

The Superconducting Magnet Group at Lawrence Berkeley National Laboratory has been developing high-field, brittle-superconductor, accelerator magnet technology, in which the conductor's support system can significantly impact conductor performance (as well as magnet training). A recent H-dipole coil test (HD1) achieved a peak bore-field of 16 Tesla, using two, flat-racetrack, double-layer Nb{sub 3}Sn coils. However, its 4.5 K training was slow, with an erratic plateau at {approx}92% of its un-degraded ''short-sample'' expectation ({approx}16.6 T). Quench-origins correlated with regions where low conductor pre-stress had been expected (3-D FEM predictions and variations in 300 K coil-size). The coils were re-assembled with minor coil-support changes and re-tested as ''HD1b'', with a 185 MPa average pre-stress (30 MPa higher than HD1, with a 15-20 MPa pole-turn margin expected at 17 T). Training started higher (15.1 T), and quickly reached a stable, negligibly higher plateau at 16 T. After a thermal cycle, training started at 15.4 T, but peaked at 15.8 T, on the third attempt, before degrading to a 15.7 T plateau. The temperature dependence of this plateau was explored in a sub-atmospheric LHe bath to 3.0 K. Magnet performance data for both thermal cycles is presented and discussed, along with issues for future high-fieldmore » accelerator magnet development.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Ernest Orlando Lawrence Berkeley NationalLaboratory, Berkeley, CA(US)
Sponsoring Org.:
USDOE Director. Office of Science. Office of High EnergyPhysics
OSTI Identifier:
887432
Report Number(s):
LBNL-54894
R&D Project: 454001; BnR: KA1502010; TRN: US0604262
DOE Contract Number:  
DE-AC02-05CH11231
Resource Type:
Conference
Resource Relation:
Conference: Applied Superconductivity Conference,Jacksonville, FL, Oct 3-8, 2004
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ACCELERATORS; DIPOLES; MAGNETS; PERFORMANCE; SUPERCONDUCTING MAGNETS; SUPERCONDUCTIVITY; TEMPERATURE DEPENDENCE; TRAINING

Citation Formats

Lietzke, A.F., Bartlett, S.E., Bish, P., Caspi, S., Dietderich,D., Ferracin, P., Gourlay, S., Hafalia, A.R., Hannaford, C.R., Higley,H., Lau, W., Liggins, N., Mattafirri, S., Nyman, M., Sabbi, G., Scanlan,R., and Swanson, J. Test Results of HD1b, an upgraded 16 Tesla Nb3Sn DipoleMagnet. United States: N. p., 2005. Web.
Lietzke, A.F., Bartlett, S.E., Bish, P., Caspi, S., Dietderich,D., Ferracin, P., Gourlay, S., Hafalia, A.R., Hannaford, C.R., Higley,H., Lau, W., Liggins, N., Mattafirri, S., Nyman, M., Sabbi, G., Scanlan,R., & Swanson, J. Test Results of HD1b, an upgraded 16 Tesla Nb3Sn DipoleMagnet. United States.
Lietzke, A.F., Bartlett, S.E., Bish, P., Caspi, S., Dietderich,D., Ferracin, P., Gourlay, S., Hafalia, A.R., Hannaford, C.R., Higley,H., Lau, W., Liggins, N., Mattafirri, S., Nyman, M., Sabbi, G., Scanlan,R., and Swanson, J. Sat . "Test Results of HD1b, an upgraded 16 Tesla Nb3Sn DipoleMagnet". United States. https://www.osti.gov/servlets/purl/887432.
@article{osti_887432,
title = {Test Results of HD1b, an upgraded 16 Tesla Nb3Sn DipoleMagnet},
author = {Lietzke, A.F. and Bartlett, S.E. and Bish, P. and Caspi, S. and Dietderich,D. and Ferracin, P. and Gourlay, S. and Hafalia, A.R. and Hannaford, C.R. and Higley,H. and Lau, W. and Liggins, N. and Mattafirri, S. and Nyman, M. and Sabbi, G. and Scanlan,R. and Swanson, J.},
abstractNote = {The Superconducting Magnet Group at Lawrence Berkeley National Laboratory has been developing high-field, brittle-superconductor, accelerator magnet technology, in which the conductor's support system can significantly impact conductor performance (as well as magnet training). A recent H-dipole coil test (HD1) achieved a peak bore-field of 16 Tesla, using two, flat-racetrack, double-layer Nb{sub 3}Sn coils. However, its 4.5 K training was slow, with an erratic plateau at {approx}92% of its un-degraded ''short-sample'' expectation ({approx}16.6 T). Quench-origins correlated with regions where low conductor pre-stress had been expected (3-D FEM predictions and variations in 300 K coil-size). The coils were re-assembled with minor coil-support changes and re-tested as ''HD1b'', with a 185 MPa average pre-stress (30 MPa higher than HD1, with a 15-20 MPa pole-turn margin expected at 17 T). Training started higher (15.1 T), and quickly reached a stable, negligibly higher plateau at 16 T. After a thermal cycle, training started at 15.4 T, but peaked at 15.8 T, on the third attempt, before degrading to a 15.7 T plateau. The temperature dependence of this plateau was explored in a sub-atmospheric LHe bath to 3.0 K. Magnet performance data for both thermal cycles is presented and discussed, along with issues for future high-field accelerator magnet development.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {4}
}

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