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Title: Persistent-current magnetizations of Nb 3Sn 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 Nb 3Sn'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-Bmore » 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.« less

Authors:
 [1];  [2];  [2];  [3];  [3];  [4];  [4]
  1. The Ohio State Univ., Columbus, OH (United States). Center for Superconducting and Magnetic Materials (CSMM), Dept. of Materials Science and Engineering
  2. The Ohio State Univ., Columbus, OH (United States). Center for Superconducting and Magnetic Materials (CSMM), Dept. of Materials Science and Engineering
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Superconducting Magnet Group
  4. 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) (SC-25)
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. doi: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. doi: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 = {2017},
month = {12}
}

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