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Ramp-rate limitation test of cable-in-conduit conductors with supercritical helium

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4 Author(s)
Jeong, S. ; Plasma Fusion Center, MIT, Cambridge, MA, USA ; Takayasu, M. ; Minervini, J.V. ; Schultz, J.H.

It has been found on the United States Demonstration Poloidal Coil (US-DPC) and in 27 strand subsized cables of pool boiling cable-in-conduit conductor (CICC), that there is critical current degradation due to fast ramping of the magnetic field. The characteristics of this ramp-rate limitation phenomenon are investigated by using a 27 strand Nb/sub 3/Sn cable in supercritical helium at 6 atm. A 3 m long cable-in-conduit conductor is prepared noninductively and tested in a background field up to 9.5 tesla with maximum ramp rate of 1.6 tesla/second. The ramp-rate limitation results are compared with results of the ramp rate test of the US-DPC and previous experiments. The experimental data are analyzed to identify and understand possible sources of ramp-rate limitation.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )