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

Abstract

Quench protection is a critical issue for magnet using high temperature superconducting (HTS) materials like REBCO. For cable-in-conduit conductor (CICC) with twisted REBCO tapes, the angular dependent critical current density (Jc) of tape will further complicates the quench behavior. The CryoSoft code THEA is used to simulate the quench behavior of various sub-scale CICC in view of a quench experiment in SULTAN facility. The CICC are composed of the twisted tape stack assembled into copper shell (strand). It has been found that neglecting the angular dependence of Jc in quench simulation will significantly underestimate the hot spot temperature therefore leave potential risk to damage the magnet. It is also shown that the contact thermal resistance between strand and the steel jacket plays a very important role on quench behavior. On the other hand, the interstrand electric/thermal resistance has very little influence.

Advance in the conceptual design of the European DEMO magnet system

“…In order to maintain current flow during quench, the SULTAN superconducting transformer will be replaced by a DC power supply providing 15 kA current. The first theoretical studies were done in order to understand how to exploit this unique experimental opportunity [43], [44].…”

Dipole Magnets above 20 Tesla: Research Needs for a Path via High-Temperature Superconducting REBCO Conductors

“…One question is how the heating and temperature develop in a multi-tape REBCO conductor [147][148][149]. Would the current sharing between tapes in a multi-tape architecture reduce the peak temperature compared to a single tape [150,151]? The answer through both experimental and computational studies will be important to understand the quench behavior of conductors with different margins due to local defects (Section 3.3) and/or different magnetic fields, temperatures and strain states in a coil.…”

“…The key parameters here are the electrical and thermal contact resistances between tapes that can affect the current sharing and quench dynamics [149,151]. With a contact resistivity ranging from 20 to 100 µΩ cm 2 [152], the non-insulation REBCO solenoid magnet technology demonstrates the self-protection capability thanks to the current sharing between the tapes [153].…”

“…The maximum allowable temperature in a REBCO conductor will determine the strategies for quench detection and protection. This peak temperature can depend on the conductor architecture [151] and can be established experimentally [154][155][156][157]. Two options can limit the peak temperature during a quench [158,159].…”

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

“…This document is the accepted manuscript version of the following article: of REBCO conductors, for example the angular dependent Ic against magnetic field [11,14]. With this model, some interesting questions could be answered.…”