Estimation of Heat Generation in Multi-Contact Connector for Superconducting Magnet Application

초전도자석 시스템 응용을 위한 멀티-컨텍 커넥터의 열 발생 특성 평가

  • Received : 2012.09.07
  • Accepted : 2012.10.15
  • Published : 2012.12.31

Abstract

Current leads are one of the important components for carrying the current to the coil in the superconducting magnet system. Heat leakage through the current lead is the major factor of entire heat load in the cryogenic system because current leads carry the current from room temperature to near 4 K, connecting thermally each other. Therefore, minimization heat load through current lead can reduce the operating temperature of superconducting magnet. The semi-retractable current lead, composed of multi-contact connector and HTS element, is one of good options. Comprehension of Multi-contact connector's structure, contact resistance and heat generation is essential for estimating heat generation in current leads. Multi-contact connector has several louvers inside of socket and the shape, number, size of louvers are different with the size of connector. Therefore contact area, current path and contact resistance are also different. In this study, the contact resistance in multi-contact connector is measured using the electrical power as a function of connector's size and temperature. Also, the unique correlation of electrical contact resistance is derived and heat generation is estimated for superconducting magnet application.

Keywords

References

  1. M.N. Wilson, Superconducting Magnets. Oxford: Clarendon Press, 1986, pp. 256-278.
  2. A.M. Kadin, R. J. Webber, and D. Gupta, "Current leads and optimized thermal packaging for superconducting systems on multistage cryocooler", IEEE Trans. Appl. Supercond., vol. 17, no. 2, pp. 975-978, 2007. https://doi.org/10.1109/TASC.2007.898719
  3. L. Ren, Y.Tang, J. Shi, N. Chen, J. Li, and S. Cheng, "Cryocooler cooled HTS current lead for a 35KJ/7Kw-class high-Tc SMES system", Physica C, vol. 468, pp. 2115-2118, 2008. https://doi.org/10.1016/j.physc.2008.05.231
  4. S. Yang and J. M. Pfontenhauer, "Optimization of the intercept temperature for high temperature superconducting current lead", Adv. Cryogenic Eng., vol. 41, pp. 567-572, 1996.
  5. H. M Chang, Y. S. Choi, S. W. Van Sciver, and J. R. Miller, "Optimization of current leads cooled by natural convention of vapor", Adv. Cryogenic Eng., vol. 49, pp. 944-951, 2004 .
  6. Multi-Contact Co., "Multilam product documentation", Santa Rosa, CA [Online]. Available: http://www.multi-contact-usa.com.
  7. Y.S. Choi, D. L. Kim, B. S. Lee, H. S. Yang, W. M. Jung, "Development of a conduction-cooled superconducting magnet system for material separation", Progress in superconductivity, vol. 10, no. 1, pp. 50-54, 2008.
  8. Temperature measurement and control catalog., [Online] http://www.lakeshore.com.