Characteristics of round and extracted strands of Nb3Al Rutherford cable

Conference · Tue Aug 01 04:00:00 EDT 2006

OSTI ID:899983

Kikuchi, A; Yamada, R; Ambrosio, G; Andreev, N; Barzi, E; Cooper, C; Iijima, Y; Kobayashi, M; Kitaguchi, H; Nimori, S; Lamm, M; Tagawa, K; Takeuchi, T; Tsuchiya, K; Turrioni, D; Wake, M; Zlobin, A V

Long Nb{sub 3}Al strands with copper stabilizer are promising for future high field accelerator magnets. A 1.2 kilometer Nb{sub 3}Al strand with Cu stabilizer was fabricated at the National Institute for Materials Science in Japan. Using this strand a 30 meter Cu stabilized Nb{sub 3}Al Rutherford cable was made for the first time by a collaboration of NIMS and Fermilab. The Nb{sub 3}Al strands extracted from cable with a relatively low packing factor showed almost no J{sub c} degradation. But the extracted strands from the highly compacted cable showed some degradation in both J{sub c} and n value, which may be caused by local separation of the copper stabilizer. Still, its J{sub c} degradation is lower than that of typical Nb{sub 3}Sn strands. The current limit due to magnetic instability in low field is about 500 A at 4.2 K. The magnetization of the strands, which was measured with balanced coils at 4.2 K, showed large flux jumps, usually around 1.5 T. This value is much larger than the B{sub c2} (4.2 K) of the Nb matrix, which is around 0.4 Tesla. The magnetic instability of the Nb{sub 3}Al strand at low field is not completely understood, but it might be explained by the superconducting coupling current through the Nb matrix.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 899983
• Report Number(s): FERMILAB-CONF-06-295-TD
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ACCELERATORS
Accelerators
CABLES
COPPER
FERMILAB
INSTABILITY
MAGNETIC FLUX
MAGNETIZATION
MAGNETS
METERS
SUPERCONDUCTIVITY