Based on finite element method (FEM) and difference method, a simulation method for the quench behavior of superconductors is introduced in this paper. With this method, the heat conduction equation of a superconductor under a thermal disturbance can be solved simply and visually. The stability of an REBCO high temperature superconducting tape under adiabaticapproximation is simulated, and ...
Previously we reported our new circuit model, named as “B model”, for fast and effective simulation of a no-insulation (NI) high temperature superconductor (HTS) coil having a “single” defect. A primary benefit of the “B model” over the conventional distributed network model is to use only “five segments” of the defect-existing turn in an NI HTS coil, while a substantially larger number of...
Abstract
This work presents an experimental study on electromagnetic and thermal behaviors caused by a quench propagation on a no-insulation (NI) high temperature superconductor (HTS) coil. To observe quench behaviors of NI HTS coil, 25-turn NI single pancake test coil was wound, and an overcurrent experiment was performed in conduction-cooled condition. Since the quench is a local and...
High-temperature superconducting REBCO coated conductor is one of the main candidates for next-generation high field magnets in fusion reactors and particle accelerators owing to their high current-carrying capability. While these materials can operate at higher temperatures and generate higher magnetic fields than their counterparts with lower critical temperatures, protecting the REBCO...
Conductor on round core (CORC) cables composed of YBCO coated conductors and a former show significance in high current capacity and mechanical flexibility. However, YBCO coated conductors are vulnerable to a local quench, and this disadvantage can affect the thermal stability of the CORC cables. Therefore, this paper first develops a 3D electromagnetic-thermal cable model with the termination...
The No-insulation (NI) coil's turn-to-turn current paths prevent local heating by forcing the current to bypass into nearby turns when a hot spot appeared in a coil. However, the bypassing current will reduce the magnetic field that generates unwanted induced currents in the adjacent coils in a multiply-stacked HTS magnet. This induced current can temporarily exceed the designed maximum...
Chris Reis1,2, Laura Garcia Fajardo1, Tengming Shen1
1. Lawrence Berkeley National Laboratory, Berkeley, CA, 94720
2. University of California, Berkeley, CA, 94720
High temperature superconducting magnets have the potential to generate magnetic field of greater than 20 T for compact fusion reactors, particle physics colliders and nuclear magnetic resonance. A key remaining technology...
We designed and fabricated a prototype high temperature superconducting(HTS) sextupole magnet for the chromaticity correction of an asymmetric–energy collider, named SuperKEKB. The HTS sextupole magnet consists of six two-layer-rectangular REBa2Cu3Oy(REBCO) coils, which are wound with a 4-mm-wide coated conductor and impregnated with the epoxy resin. In this study, we measured quench...
Implementing an efficient quench protection system in a classical insulated High Temperature Superconductor coil remains complicated and risky. Since about ten years, many groups have been working on novel windings consisting on removing the classical insulation between turns. This solution improves the thermal stability, and it avoids local degradations in case of a quench. One named them as...
