WInd-and-react Bi-2212 coil development for accelerator magnets

Journal Article · Tue Oct 13 04:00:00 EDT 2009 · Superconductor Science and Technology

OSTI ID:1011509

Godeke, A; Acosta, P; Cheng, D; Dietderich, D R; Mentink, M G. T.; Prestemon, S O; Meinesz, M; Hong, S; Huang, Y; Miao, H; Parrell, J; Sabbi, G L

Sub-scale coils are being manufactured and tested at Lawrence Berkeley National Laboratory in order to develop wind-and-react Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub x} (Bi-2212) magnet technology for future graded accelerator magnet use. Previous Bi-2212 coils showed significant leakage of the conductors core constituents to the environment, which can occur during the partial melt reaction around 890 C in pure oxygen. The main origin of the observed leakage is intrinsic leakage of the wires, and the issue is therefore being addressed at the wire manufacturing level. We report on further compatibility studies, and the performance of new sub-scale coils that were manufactured using improved conductors. These coils exhibit significantly reduced leakage, and carry currents that are about 70% of the witness wire critical current (I{sub c}). The coils demonstrate, for the first time, the feasibility of round wire Bi-2212 conductors for accelerator magnet technology use. Successful high temperature superconductor coil technology will enable the manufacture of graded accelerator magnets that can surpass the, already closely approached, intrinsic magnetic field limitations of Nb-based superconducting magnets.

• Research Organization: Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
• Sponsoring Organization: Accelerator& Fusion Research Division
• DOE Contract Number: AC02-05CH11231
• OSTI ID: 1011509
• Report Number(s): LBNL-4408E
• Journal Information: Superconductor Science and Technology, Journal Name: Superconductor Science and Technology Journal Issue: 3 Vol. 23; ISSN SUSTEF; ISSN 0953-2048
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACCELERATORS
COMPATIBILITY
CRITICAL CURRENT
MAGNETIC FIELDS
MAGNETS
MANUFACTURING
ORIGIN
OXYGEN
PERFORMANCE
SUPERCONDUCTING MAGNETS
SUPERCONDUCTORS