Quench Analysis of a High-Current Forced-Flow HTS Conductor Model for Fusion Magnets

Abstract

Abstract-A fundamental understanding of the quench phenomenon is particularly important in the design and operation of magnets using High Temperature Superconductors because the quench propagation velocity is low due to high specific heat at high temperature. We have performed the simulations of a high-current forced-flow conductor model to assess the key quench parameters, e.g. the temperature increase of the normal zone and its propagation velocity, using the CryoSoft code THEA. The sensitivity of these results on conductor design and operation parameters was assessed with a variational analysis. Results show that the helium flow has a beneficial impact on the longitudinal propagation of the normal zone and the resulting reduction of the peak quench temperature.

To the Optimization of Quench Performance for a Large REBCO Cable-in-Conduit Conductor

“…The modelling of a quench in REBCO conductor is implemented by solving 1-D thermal, electrical, and hydraulic equation sets, as well as their coupling, with THEA code. Considering that the principles of the code were already well explained by the authors and some users [13,[15][16][17], meanwhile our REBCO model was also detailed introduced in our former publications [11,14], they are only briefly recalled here.…”

Quench Simulation of REBCO Cable-in-Conduit Conductor With Twisted Stacked-Tape Cable

“…In addition, the tapes are not twisted and the magnetic field is always parallel to the c-axis of the tapes. This is the model so far used in most of the quench simulation studies (see [1,2,11,12,20]).…”

“…The thermal capacity of the steel jacket is beneficial to reduce the hot spot temperature [2,11]. The transverse heat propagation accelerated by reduced thermal resistance between tapes can also reduce the hot spot temperature [12]. However, in all these studies the angular dependent J c of REBCO tape was neglected.…”

Stability study of Bi-2212 conductor based on perturbation spectrum for hybrid superconducting magnet

“…However, the temperature distribution of short perturbation only shows symmetry in a small period. With time increase, temperature begins to propagate along the downstream direction of helium, which is supposed to be attributed to the effect of helium . And there is only one stair with a peak getting fatter and propagating.…”