skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

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. 2005. "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 = {},
url = {https://www.osti.gov/biblio/887432}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {4}
}

Conference:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this conference proceeding.

Save / Share: