Studies on Stabilities of Superconducting Rutherford Cables
Superconducting accelerator magnets have shown different excitation ramp rate dependencies in the quench current. One of the main reasons of the above degradation is caused by AC losses, which is easily affected by curing conditions, between strands of the Rutherford cables. Other reasons have not been clarified at this moment. It is possible that the current sharing among strands in steady state or transient state induces the instability of the cable. We have measured the minimum quench energies of two types of the Rutherford cables with a Cu matrix and a CuMn barrier inside a Cu sheath. Normal zone propagation speeds in longitudinal and transverse direction also have been measured in conjunction with their interstrand resistances by using voltage taps attached to each strand. These results are discussed with analysis.
KeywordsContact Resistance Propagation Speed Heating Time Transport Current Normal Zone
Unable to display preview. Download preview PDF.
- 1.S. W. Kim, T. Shintomi, N. Kimura, Y. Makida, H. Hirabayashi, T. Mito, A. Iwamoto, J. Yamamoto and A. Kimura “Experimental Studies on Stabilities of Rutherford Cables for Superconducting Accelerator Magnetsb,” Magnet Technology 14 (MT-14), Tempere Finland, June 11–16, 1995.Google Scholar
- 2.A. Kimura, S. W. Kim, N. Kimura, Y. Makida, T. Shintomi, H. Hirabayashi, T. Mito, A. Iwamoto and J. Yamamoto, “Stabilities of the Rutherford Cables with Cu Matrix and CuMn Barrier,” Applied superconductivity conference, Boston USA., October 16–21, 1994.Google Scholar
- 3.B. Turck, “Influence of a Transverse Conductance on Current Sharing in a Two-layer Superconducting Cable,” Cryogenics, 1974.10, pp 448 – 454.Google Scholar
- 6.M. Scherer, P. Turowski, “Investigation of the Propagation Velocity of a Normal-conducting Zone in Technical Superconductors,” Cryogenics, 1978.09, pp 515 – 520.Google Scholar
- 7.G. Ries, “Stability in Superconducting Multistrand Cables,” Cryogenics, 1980.09, pp 513 – 519.Google Scholar
- 9.Y. Lei et al., “Study on Interstrand Coupling Losses in Rutherford-type Superconducting cables,” KEK report, 92–18, Feb. 1993.Google Scholar
- 10.Martin M. Wilson,“Superconducting Magnets,” Clarendon Press. Oxford, United Kingdom, 1983.Google Scholar