Forced-flow-cooled superconducting coil (FCC) has several advantages: large stability margin; high mechanical rigidity; and good electrical insulation. As a result, FCC could provide efficient superconducting magnet systems for such large machines as fusion devices.
Cable-in-conduit conductor (CICC) is regarded to be most attractive for FCC because of its good heat transfer characteristics which make the magnet more stable against disturbances. However, there are some problems. One problem is that the coolant pressure will become very high during a quench because its hydraulic diameter is relatively small. Also. the propagation of a normal zone has a close relation with the pressure rise. These characteristics must be considered in designing and protecting FCC.
This paper describes the results of the stability tests of FCC and the analyses of these characteristics. and compares them with the results of numerical simulations.
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