Liyang Ye is a graduate student from China, whose research is mainly focusing on experimental study for quench characteristics of high temperature superconductors (HTS, including Bi2212 and YBCO) and MgB2 conductors.
Superconducting magnet systems are the enabling technology for several research fields, e.g., experimental high-energy physics, fusion and MRI. Compared to the traditional low temperature superconductors (LTS), HTS and MgB2 conductor present far less cooling costs as the benefit of higher Tc, and also in the application to high field magnets, HTS has the added attraction of being able to carry more current at higher magnetic fields.
However, those new superconductors bring a challenge for designing the magnet quench protection system, because their normal zone propagation velocity is often two orders of magnitude slower than in LTS under equal cooling conditions, which means the normal zone is unable to be distributed quickly through the winding during a quench, so the stored energy will be dissipated over a very limited area, resulting a localized hot spot to cause burn out in the conductor and even destroy the magnet. Currently, driving mechanisms for quench behavior have not been isolated clearly for HTS and MgB2 conductor, so Liyang has dedicated his doctoral research to the experimental study for understanding the quench behaviors and stability limits of HTS and MgB2 conductor, so that these conductor properties could be properly incorporated into superconducting magnet system design.
- L. Ye, D. Cruciani, T. Effio, F. Hunte, and J. Schwartz, “On the Causes of Degradation in Bi2Sr2CaCu2O8+x Round Wires and Coils by Quenching at 4.2 K,” IEEE Transactions on Applied Superconductivity, vol. 23, pp. 6400811-6400811, 2013.
- S. Ishmael, H. Luo, M. White, F. Hunte, X. Liu, N. Mandzy, J. Muth, G. Naderi, L. Ye, A. Hunt, J. Schwartz, “Enhanced Quench Propagation in Bi2Sr2CaCu2Ox and YBa2Cu3O7-x Coils via a Nanoscale Doped-Titania-Based Thermally Conducting Electrical Insulator,” IEEE Transactions on Applied Superconductivity, vol. 23, pp. 7201311-7201311, 2013.
- L. Ye, F. Hunte, and J. Schwartz, “Effects of high magnetic field on the quench behavior of Bi2Sr2CaCu2Ox coils at 4.2 K,” Superconductor Science and Technology, vol. 26, p. 055006, 2013.