The stability of Nb3Sn-composite conductors cooled by normal and superfluid helium

✍ Scribed by P. Turowski

• Publisher: Elsevier Science
• Year: 1981
• Tongue: English
• Weight: 677 KB
• Volume: 21
• Category: Article
• ISSN: 0011-2275
• DOI: 10.1016/0011-2275(81)90029-1

✦ Synopsis

The stability of Nb3Sn superconductors, which were additionally stabilized by soldering copper to the prereacted cable, was investigated. Cooling channels in a sample coil provided access to LHe in the 4.2 K and the 1.85 K temperature range. The measurements show that a heat flow rate of 0.6 W cm -2 at 4.2 K in the Nb3Sn composite conductor guarantees a stable operation even at local heat inputs of about 0.5 J onto the surface of the conductor. In superfluid helium, recovery up to the take-off values of current in magnetic fields between 8 T and 13 T was found. A theoretical analysis was performed to explain the experimental results with respect to the cooling channel geometry, magnetic fields, and the local energy inputs to initiate a normal conducting region.