DocumentCode :
974374
Title :
Wire Development for Future Accelerator MagnetsAuthor :
Tsuchiya, K. ; Mitsuda, C. ; Terashima, A. ; Takeuchi, T. ; Banno, N. ; Nimori, S. ; Seki, Y.. ; Ohno, M.. ; Okamoto, K.. ; Nakamura, K. ; Takao, T. ; Ikeda, T. ; Higuchi, T. ; Tagawa, K. ; Iwaki, G.
Author_Institution :
High Energy Accelerator Res. Organ., Ibaraki
Volume :
16
Issue :
2
fYear :
2006
fDate :
6/1/2006 12:00:00 AM
Firstpage :
1204
Lastpage :
1207
Abstract :
Recent developments in RHQ Nb3Al wire for accelerator magnets are presented and discussed. The main items of the development are to increase the critical current density (Jc) and to find a good stabilization method. For the former item, test wires with different Nb-matrix/filament ratios were made, and the effect of the ratio on Jc was investigated in correlation with the heat treatment and the area reduction after the RHQ process. For the latter item, a special copper electroplating technique was developed to deposit a thick Cu layer on the surface of the wire. The mechanical bonding strength and the electrical characteristics of the Cu layer were studied by bending and drawing the wire, and by measuring the resistance. Although the present piece length of the Cu stabilized Nb3Al wire is about 40 cm, we can draw and reduce the wire down to 60% of the original diameter, without breaking the wire or damaging the bonding of the Cu stabilizer. The highest noncopper Jc achieved during this study was 2156 A/mm2 at 10T and 4.2 K
Keywords :
accelerator magnets; aluminium alloys; bending; bonding processes; critical current density (superconductivity); electric resistance; electroplating; niobium alloys; proton accelerators; quenching (thermal); storage rings; superconducting magnets; superconducting materials; synchrotrons; wire drawing; Cu; LHC; Nb3Al; Nb3Al wire; RHQ process; accelerator magnets; bending; copper electroplating; copper stabilizer; critical current density; drawing; electrical characteristics; heat treatment; mechanical bonding strength; quenching process; rapid-heating process; resistance measurement; stabilization method; thick Cu layer; Accelerator magnets; Bonding; Copper; Critical current density; Heat treatment; Niobium; Surface resistance; Surface treatment; Testing; Wire; Accelerator magnet; critical current density; rapid-heating/quenching process;
fLanguage :
English
Journal_Title :
Applied Superconductivity, IEEE Transactions on
Publisher :
ieee
ISSN :
1051-8223
Type :
jour
DOI :
10.1109/TASC.2006.871298
Filename :
1643065
Link To Document :
