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

Title: Development of REBCO-based Symmetric Tape Round (STAR) wire for the Next Generation High-field Compact Accelerator Magnets

Abstract

In the Phase I SBIR program, AMPeers and its Research Institution partner, the University of Houston, successfully achieved the overarching goal of fabricating Symmetric Tape Round (STAR) RE-Ba-Cu-O (REBCO, RE=rare earth) wires suitable for use in Canted Cosine Theta (CCT) coils designed for use in future accelerator magnets. We developed five different STAR wire architectures made with REBCO tapes with 18 – 22 µm thick substrate and widths from 1.4 to 2.6 mm. All STAR wire architectures displayed critical current over 400 A at 77 K, self-field. We have optimized the thickness of the copper stabilizer for REBCO tapes made with different substrate thicknesses ranging from 18 to 25 μm, based on critical current retention when the tapes are bent or spiral wound at different strain levels. Symmetric tapes as narrow as 1.4 mm and 1.8 mm were used to wind STAR wires on ultra-small 0.51 mm diameter (AWG 22) copper formers. Essentially all STAR wires are less than 2mm in outer diameter, which is a unique feature unmatched by any other round REBCO wire technology. In fact, a STAR wire as small as 1.3 mm in diameter was demonstrated using 0.51 mm diameter copper wire former. Our recent STARmore » exhibits engineering current density (Je) values of 739 A/mm2 at 15 T and 584 A/mm2 at 20 T which are record values for round REBCO wires and very close to the initial Je target for CCT coils. The Je of STAR wires has been increased 30% higher than the Je of STAR wires tested an year ago. The critical current (Ic) of STAR wires tested in March 2019 has reached nearly 1400 A at 4.2 K, 24 T which is nearly 80% higher than the Ic of STAR wires tested an year ago. We constructed a 3-turn CCT coil with 2 m long STAR wires. The STAR wire exhibits a Je of 184 A/mm2 and retains 94.7% of its Ic at 77 K, self-field even when wound on the CCT former at a 15 mm bend radius.« less

Authors:
 [1]
  1. AMPeers LLC
Publication Date:
Research Org.:
AMPeers LLC, Houston, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
AMPeers LLC
OSTI Identifier:
1580716
Report Number(s):
DOE-AMPeers-18850
DOE Contract Number:  
SC0018850
Type / Phase:
SBIR (Phase I)
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; superconductor, magnet, accelerator

Citation Formats

Kar, Soumen. Development of REBCO-based Symmetric Tape Round (STAR) wire for the Next Generation High-field Compact Accelerator Magnets. United States: N. p., 2020. Web.
Kar, Soumen. Development of REBCO-based Symmetric Tape Round (STAR) wire for the Next Generation High-field Compact Accelerator Magnets. United States.
Kar, Soumen. Thu . "Development of REBCO-based Symmetric Tape Round (STAR) wire for the Next Generation High-field Compact Accelerator Magnets". United States.
@article{osti_1580716,
title = {Development of REBCO-based Symmetric Tape Round (STAR) wire for the Next Generation High-field Compact Accelerator Magnets},
author = {Kar, Soumen},
abstractNote = {In the Phase I SBIR program, AMPeers and its Research Institution partner, the University of Houston, successfully achieved the overarching goal of fabricating Symmetric Tape Round (STAR) RE-Ba-Cu-O (REBCO, RE=rare earth) wires suitable for use in Canted Cosine Theta (CCT) coils designed for use in future accelerator magnets. We developed five different STAR wire architectures made with REBCO tapes with 18 – 22 µm thick substrate and widths from 1.4 to 2.6 mm. All STAR wire architectures displayed critical current over 400 A at 77 K, self-field. We have optimized the thickness of the copper stabilizer for REBCO tapes made with different substrate thicknesses ranging from 18 to 25 μm, based on critical current retention when the tapes are bent or spiral wound at different strain levels. Symmetric tapes as narrow as 1.4 mm and 1.8 mm were used to wind STAR wires on ultra-small 0.51 mm diameter (AWG 22) copper formers. Essentially all STAR wires are less than 2mm in outer diameter, which is a unique feature unmatched by any other round REBCO wire technology. In fact, a STAR wire as small as 1.3 mm in diameter was demonstrated using 0.51 mm diameter copper wire former. Our recent STAR exhibits engineering current density (Je) values of 739 A/mm2 at 15 T and 584 A/mm2 at 20 T which are record values for round REBCO wires and very close to the initial Je target for CCT coils. The Je of STAR wires has been increased 30% higher than the Je of STAR wires tested an year ago. The critical current (Ic) of STAR wires tested in March 2019 has reached nearly 1400 A at 4.2 K, 24 T which is nearly 80% higher than the Ic of STAR wires tested an year ago. We constructed a 3-turn CCT coil with 2 m long STAR wires. The STAR wire exhibits a Je of 184 A/mm2 and retains 94.7% of its Ic at 77 K, self-field even when wound on the CCT former at a 15 mm bend radius.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {1}
}

Technical Report:
This technical report may be released as soon as January 2, 2024
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: