Persistent-current magnetizations of Nb3Sn Rutherford cables and extracted strands
Abstract
The magnetizations of eight high-gradient quadrupole cables designated HQ and QXF and a pair of strands, identical in architecture but with different effective strand diameters extracted from an HQ and a related QXF cable, were measured. In the service of field quality assessment, the cable magnetizations and losses were measured by pickup coil magnetometry at 4.2 K in face-on fields, B m , of ± 400 mT at frequencies, f, of up to 60 mHz. Based on the coupling component of loss, Q coup , the coupling magnetization M coup = Q coup /4B m was derived for a ramp rate of 7.5 mT/s. Persistent current (shielding) magnetization and loss (M sh and Q h,strand ) were measured on short pieces of extracted strand by vibrating sample magnetometry at 4.2 K. Unpenetrated M-B loops to ±400 mT and fully penetrated loops to ±14 T were obtained. M coup can be easily controlled and reduced to relatively small values by introducing cores and adjusting the preparation conditions. But in low fields near injection Nb3Sn's high J c and correspondingly high M sh,cable may call for magnetic compensation to preserve field quality. The suitably adjusted cable and strand fully penetrated M-B loopsmore »
- Authors:
-
- The Ohio State Univ., Columbus, OH (United States). Center for Superconducting and Magnetic Materials (CSMM), Dept. of Materials Science and Engineering
- The Ohio State Univ., Columbus, OH (United States). Center for Superconducting and Magnetic Materials (CSMM), Dept. of Materials Science and Engineering
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Superconducting Magnet Group
- Univ. of Twente, Enschede (Netherlands). Energy, Materials, and Systems Group
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1602810
- Grant/Contract Number:
- AC02-05CH11231; SC0010312; SC0011721
- Resource Type:
- Accepted Manuscript
- Journal Name:
- IOP Conference Series. Materials Science and Engineering
- Additional Journal Information:
- Journal Volume: 279; Conference: IOP Conference Series: Materials Science and Engineering; Journal ID: ISSN 1757-8981
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Collings, E. W., Sumption, M. D., Myers, C. S., Wang, X., Dietderich, D. R., Yagotyntsev, K., and Nijhuis, A. Persistent-current magnetizations of Nb3Sn Rutherford cables and extracted strands. United States: N. p., 2017.
Web. doi:10.1088/1757-899X/279/1/012037.
Collings, E. W., Sumption, M. D., Myers, C. S., Wang, X., Dietderich, D. R., Yagotyntsev, K., & Nijhuis, A. Persistent-current magnetizations of Nb3Sn Rutherford cables and extracted strands. United States. https://doi.org/10.1088/1757-899X/279/1/012037
Collings, E. W., Sumption, M. D., Myers, C. S., Wang, X., Dietderich, D. R., Yagotyntsev, K., and Nijhuis, A. Fri .
"Persistent-current magnetizations of Nb3Sn Rutherford cables and extracted strands". United States. https://doi.org/10.1088/1757-899X/279/1/012037. https://www.osti.gov/servlets/purl/1602810.
@article{osti_1602810,
title = {Persistent-current magnetizations of Nb3Sn Rutherford cables and extracted strands},
author = {Collings, E. W. and Sumption, M. D. and Myers, C. S. and Wang, X. and Dietderich, D. R. and Yagotyntsev, K. and Nijhuis, A.},
abstractNote = {The magnetizations of eight high-gradient quadrupole cables designated HQ and QXF and a pair of strands, identical in architecture but with different effective strand diameters extracted from an HQ and a related QXF cable, were measured. In the service of field quality assessment, the cable magnetizations and losses were measured by pickup coil magnetometry at 4.2 K in face-on fields, B m , of ± 400 mT at frequencies, f, of up to 60 mHz. Based on the coupling component of loss, Q coup , the coupling magnetization M coup = Q coup /4B m was derived for a ramp rate of 7.5 mT/s. Persistent current (shielding) magnetization and loss (M sh and Q h,strand ) were measured on short pieces of extracted strand by vibrating sample magnetometry at 4.2 K. Unpenetrated M-B loops to ±400 mT and fully penetrated loops to ±14 T were obtained. M coup can be easily controlled and reduced to relatively small values by introducing cores and adjusting the preparation conditions. But in low fields near injection Nb3Sn's high J c and correspondingly high M sh,cable may call for magnetic compensation to preserve field quality. The suitably adjusted cable and strand fully penetrated M-B loops were in reasonable accord leading to the conclusion that strand magnetization is a useful measure of cable magnetization, and that when suitably manipulated can provide input to magnet field error calculations.},
doi = {10.1088/1757-899X/279/1/012037},
journal = {IOP Conference Series. Materials Science and Engineering},
number = ,
volume = 279,
place = {United States},
year = {Fri Dec 01 00:00:00 EST 2017},
month = {Fri Dec 01 00:00:00 EST 2017}
}
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Works referencing / citing this record:
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