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

Title: Novel Insulation Systems for Re-Makeable Joints for Superconducting cables and Demountable Magnets

Abstract

A steady state fusion reactor requires the use of superconductors to be economically attractive. TF coils based on REBCO high temperature superconductor (HTS) magnets are more attractive because they can operate at temperatures higher than liquid helium, thus easing the burden on the cryogenic cooling system, compared with earlier generation devices. These future fusion reactors will require numerous joints for construction and maintenance; joint designs must provide a low resistance current path while providing a reliable and safe insulation system. During the Phase I program, Composite Technology Development (CTD) and the Plasma Science and Fusion Center (PSFC) at the Massachusetts Institute of Technology (MIT), designed and demonstrated a simple joint configuration containing 5 superconducting tape pairs that achieved close to the predicted resistance of 350 nOhm per tape pair. Both the tape-to-tape resistance and HTS tape critical properties were unaffected by the joint insulation procedures. The joint was successfully insulated to a withstand voltage above 10 kV. Insulation was easily applied and just as easily removed when disassembling the joint and the terminal pieces were also easily disassembled. Scaling these results to a full, 40-tape cable joint yields a nominal cable joint resistance value of ~10 nOhm. At this resistance,more » power dissipation for each 10 kA, 40-tape joint would be approximately 1 W and easily accommodated within the cooling capacity provided by a 20 K cryoplant.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Composite Technology Development, Inc., Lafayette, CO (United States)
Publication Date:
Research Org.:
Composite Technology Development, Inc., Lafayette, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
Contributing Org.:
MIT Plasma Science & Fusion Center
OSTI Identifier:
1429365
Report Number(s):
DOE-CTD-17784-1
7398
DOE Contract Number:  
SC0017784
Type / Phase:
SBIR (Phase I)
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; high temperature superconductor; HTS; REBCO; joint; resistance; remountable

Citation Formats

Haight, Andrea, Haynes, Mark, Bromberg, Leslie, Michael, Philip, Takayasu, Makoto, and Radovinsky, Alexey. Novel Insulation Systems for Re-Makeable Joints for Superconducting cables and Demountable Magnets. United States: N. p., 2018. Web.
Haight, Andrea, Haynes, Mark, Bromberg, Leslie, Michael, Philip, Takayasu, Makoto, & Radovinsky, Alexey. Novel Insulation Systems for Re-Makeable Joints for Superconducting cables and Demountable Magnets. United States.
Haight, Andrea, Haynes, Mark, Bromberg, Leslie, Michael, Philip, Takayasu, Makoto, and Radovinsky, Alexey. Mon . "Novel Insulation Systems for Re-Makeable Joints for Superconducting cables and Demountable Magnets". United States.
@article{osti_1429365,
title = {Novel Insulation Systems for Re-Makeable Joints for Superconducting cables and Demountable Magnets},
author = {Haight, Andrea and Haynes, Mark and Bromberg, Leslie and Michael, Philip and Takayasu, Makoto and Radovinsky, Alexey},
abstractNote = {A steady state fusion reactor requires the use of superconductors to be economically attractive. TF coils based on REBCO high temperature superconductor (HTS) magnets are more attractive because they can operate at temperatures higher than liquid helium, thus easing the burden on the cryogenic cooling system, compared with earlier generation devices. These future fusion reactors will require numerous joints for construction and maintenance; joint designs must provide a low resistance current path while providing a reliable and safe insulation system. During the Phase I program, Composite Technology Development (CTD) and the Plasma Science and Fusion Center (PSFC) at the Massachusetts Institute of Technology (MIT), designed and demonstrated a simple joint configuration containing 5 superconducting tape pairs that achieved close to the predicted resistance of 350 nOhm per tape pair. Both the tape-to-tape resistance and HTS tape critical properties were unaffected by the joint insulation procedures. The joint was successfully insulated to a withstand voltage above 10 kV. Insulation was easily applied and just as easily removed when disassembling the joint and the terminal pieces were also easily disassembled. Scaling these results to a full, 40-tape cable joint yields a nominal cable joint resistance value of ~10 nOhm. At this resistance, power dissipation for each 10 kA, 40-tape joint would be approximately 1 W and easily accommodated within the cooling capacity provided by a 20 K cryoplant.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {3}
}

Technical Report:
This technical report may be released as soon as March 26, 2022
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item. Keep in mind that many technical reports are not cataloged in WorldCat.

Save / Share: