Tests on a 6 T Conduction-Cooled Superconducting Magnet

A 6 T conduction-cooled superconducting magnet was designed, fabricated and tested. The magnet is composed of two coaxial NbTi solenoid coils with identical axial length. Clear bore of the magnet is phi 226 mm. The magnet is installed in a vacuum cryostat with a phi 100 mm room temperature bore. The...

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Bibliographic Details
Published in:IEEE transactions on applied superconductivity 2006-06, Vol.16 (2), p.961-964
Main Authors: Dai, Y., Yan, L., Zhao, B., Song, S., Lei, Y., Wang, Q.
Format: Article
Language:English
Subjects:
Applied sciences
Boring
Coaxial components
Coils
Cold heading
COLD WORKING
Conduction-cooled magnet
Cooling
cryocooler
Cryostats
Design. Technologies. Operation analysis. Testing
Electric connection. Cables. Wiring
Electrical engineering. Electrical power engineering
Electromagnets
Electronics
Exact sciences and technology
Integrated circuits
MAGNETIC FIELD
Magnetic fields
Magnetism
MAGNETS
Niobium compounds
quench detection
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
SOLENOIDS
stress analysis
Superconducting coils
Superconducting magnets
SUPERCONDUCTIVITY
SUPERCONDUCTORS
Temperature
Testing
Titanium compounds
Various equipment and components
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Description
Summary:A 6 T conduction-cooled superconducting magnet was designed, fabricated and tested. The magnet is composed of two coaxial NbTi solenoid coils with identical axial length. Clear bore of the magnet is phi 226 mm. The magnet is installed in a vacuum cryostat with a phi 100 mm room temperature bore. The cryostat is designed in a support frame to be rotatable in a horizontal or vertical direction. A two-stage 4 K Gifford-McMahon (GM) cryocooler is used to cool down the superconducting magnet from room temperature to 4 K. The cooling power of the 4 K cold head is 1 W. A pair of Bi-2223 high temperature superconducting current leads was employed to reduce heat leakage into 4 K cold mass. Total cold mass of the superconducting magnet is about 115 kg. It takes 82 hours to cool down the magnet from 300 K to 4 K directly through the cryocooler. The superconducting magnet reached the designed central magnetic field of 6 T in the warm bore when a 115 A energizing current is applied. The superconducting magnet was stably operating more than 275 hours continuously in full field. Further, a Nb 3 Sn coil insert to be installed, the magnet can provide the maximum center field of 10 T with effective warm bore of phi 100 mm. In this paper, the detailed design, fabrication and test are presented
ISSN:1051-8223
1558-2515
DOI:10.1109/TASC.2006.873331