Title :
Measurements of ramp-rate limitation of cable-in-conduit conductors
Author :
Takayasu, M. ; Ferri, M.A. ; Gung, C.Y. ; Painter, T.A. ; Steeves, M.M. ; Minervini, J.V.
Author_Institution :
Plasma Fusion Center, MIT, Cambridge, MA, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
The ramp-rate limitation found in the US-demonstration poloidal coil (US-DPC) test was studied in a laboratory scale experiment. The ramp-rate sensitivity has been identified on a 27-strand cable-in-conduit conductor at a background ramped field to 9.5 T with various ramp rates of 0.5 T/s to 2 T/s, simulating the US-DPC test conditions. A model assuming the existence of periodic disturbances is proposed in which the disturbance frequency is directly proportional to the ramp rate of the square of field. A semi-empirical formula was developed which fits the ramp-rate limitation data of both the US-DPC large coil and the 27-strand cable. The ramp-rate limitation does not occur for currents below the conventional limiting current.<>
Keywords :
fusion reactor materials; superconducting magnets; 27-strand cable-in-conduit conductor; 9.5 T; US-DPC; US-demonstration poloidal coil; background ramped field; disturbance frequency; limiting current; periodic disturbances; ramp-rate limitation; ramp-rate sensitivity; Coils; Communication cables; Conductors; Laboratories; Magnetic flux; Performance evaluation; Plasma measurements; Power cables; Solids; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
