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35.4 T field generated using a layer-wound superconducting coil made of (RE)Ba2Cu3O7−x (RE = rare earth) coated conductor
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Image of FIG. 1.
FIG. 1.

(Color online) Critical current vs. applied field of coils A, B, and C showing the substantial difference in performance between fully epoxy impregnated coils and one that has been insulated with shrink tube. The inset is a cross sectional view of one of the earlier coils showing signs of conductor delamination at various locations throughout the winding pack.

Image of FIG. 2.
FIG. 2.

(Color online) Quench currents vs. magnetic field for two bath temperatures: 4.2 K and 1.8 K. Heating developed close to the terminals due to helium gas trapping in that region, which reduced the quench currents in the field range above 20 T.

Image of FIG. 3.
FIG. 3.

(Color online) Voltage-time evolution during a quench of coil D. The layer set 5–11 quenches first, driving the neighboring layers 1–5 and 11–21 normal soon after. The inset shows the actual coil. The leveling of the voltage at 859.35 ms is due to reaching the saturation of the signal amplifier used for the data acquisition. At 859.40 ms, the protection system is triggered causing inductive voltage spikes that again are cut off by the saturation of the signal amplifier.


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Table I.

Coil specifications.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: 35.4 T field generated using a layer-wound superconducting coil made of (RE)Ba2Cu3O7−x (RE = rare earth) coated conductor