Speaker
Description
Quench protection is the elephant in the room that no ones seems to see when it comes to HTS magnets. For the most part quench protection has not been much of a problem, because the stored energies of HTS magnets have been low compared to magnets made with LTS conductors. The principles of quench protection are the same regardless of the type of superconductor used. In general, a quench is not a problem if the adiabatic hot spot temperature at the end of the quench is less than a temperature that damages the conductor or its insulation and the magnet voltages are low enough to not breach the magnet insulation. It has long been understood that quench propagation along an HTS conductor is much slower than for a conductor like Nb-Ti. The reason for this is the large enthalpy change that occurs during a quench of an HTS conductor. The quench characteristics of an LTS magnet are a function of the conductor current density, the magnetic field at the conductor, the local temperature margin, and the ratio of copper to non-copper in the conductor. With an HTS conductor one must add the effect of field orientation in the conductor, which can affect both the critical current and the critical temperature. This paper explores a number of ways for protecting magnets made from ReBCO conductor.
| Submitters Country | USA |
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