TY - JOUR
T1 - Increase in coupling-current losses of superconducting cables due to first-stage cabling Part 2
T2 - optimum structure of solder-impregnated sub-cable with normal-metal strands
AU - Funaki, K.
AU - Ichimaru, O.
AU - Iwakuma, M.
AU - Sumiyoshi, F.
AU - Miyahara, K.
AU - Yamafuji, K.
N1 - Funding Information:
This work wass upporteidn part by a Grantf or Scientific Researcohf FusionR eactorfsr omt heM inistryo f Education, Sciencea ndC ulture,Ja pan.
PY - 1989/4
Y1 - 1989/4
N2 - We studied a.c. losses in seven-strand superconducting subcables, with normal metal strands for stabilization. In a transverse magnetic field with a trapezoidal wave form, approximate expressions for additional coupling current losses among superconducting strands through the normal metal ones were obtained by using an equivalent electric circuit model. The total losses measured in several types of the stabilized subcables were well explained by the present theoretical results. Loss-minimized strand configuration was proposed for the subcable with any given number of the normal metal strands on the basis of the present theoretical consideration. The optimum number of the normal metal strands in the subcable was also discussed under the competition between a.c. loss and current capacity based on each of a few kinds of stability conditions proposed so far. It is also pointed out that the optimized structure is strongly dependent upon cooling condition and design concepts.
AB - We studied a.c. losses in seven-strand superconducting subcables, with normal metal strands for stabilization. In a transverse magnetic field with a trapezoidal wave form, approximate expressions for additional coupling current losses among superconducting strands through the normal metal ones were obtained by using an equivalent electric circuit model. The total losses measured in several types of the stabilized subcables were well explained by the present theoretical results. Loss-minimized strand configuration was proposed for the subcable with any given number of the normal metal strands on the basis of the present theoretical consideration. The optimum number of the normal metal strands in the subcable was also discussed under the competition between a.c. loss and current capacity based on each of a few kinds of stability conditions proposed so far. It is also pointed out that the optimized structure is strongly dependent upon cooling condition and design concepts.
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U2 - 10.1016/0011-2275(89)90273-7
DO - 10.1016/0011-2275(89)90273-7
M3 - Article
AN - SCOPUS:0024648279
SN - 0011-2275
VL - 29
SP - 423
EP - 428
JO - Cryogenics
JF - Cryogenics
IS - 4
ER -