Performance and Quench Characteristics of a Pancake Coil Wound With the 2G YBCO Roebel Cable

Qingbo Zhang,Yifeng Yang,Lorenzo Cavallucci

doi:10.1109/tasc.2018.2799140

Qingbo Zhang, Yifeng Yang + Show 1 more

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https://doi.org/10.1109/tasc.2018.2799140

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Abstract

The YBCO Roebel cable is a promising option for the high-energy accelerator magnets and tokamak devices with high-current carrying capability and compactness. Referring to the complex current sharing and normal zone propagation, it is difficult to apply the traditional superconductor quench measurement methodology to such a long Roebel cable (2 m) in an adiabatic condition. An alternative method for the quench measurement is to make a Roebel pancake coil cowound with ribbon fiberglass. This paper starts reporting the methodology to wind the coil with impregnation process and the wire installment for the quench measurement. Some initial performance measurements and a first trial of the quench measurement were processed in LN2 at 77 K to show the robust performance of this Roebel cable at all the current contacts while maintaining the cable effectively adiabatic or similar to real magnets.

Highlights

T HE high current carrying capability and strong pinning in high magnetic field make the 2G HTS Roebel cable desirable for future high energy accelerators at CERN and tokamak devices [1]–[4]
We present in this paper the details of the preparation of the pancake coil, localized heater, and instrumentation setup of voltage taps and thermometers
Some research has already shown a more complex current sharing and normal zone propagation is expected for Roebel cables than those found in traditional superconducting composites due to the non-continuous touch contacts among the Roebel strands [1]–[3], [5]–[8]

Summary

Introduction

T HE high current carrying capability and strong pinning in high magnetic field make the 2G HTS Roebel cable desirable for future high energy accelerators at CERN and tokamak devices [1]–[4]. Some research has already shown a more complex current sharing and normal zone propagation is expected for Roebel cables than those found in traditional superconducting composites due to the non-continuous touch contacts among the Roebel strands [1]–[3], [5]–[8]. The standard method of experimental quench studies on adiabatic short conductors. Manuscript received September 28, 2017; accepted January 24, 2018. Date of publication January 26, 2018; date of current version February 16, 2018. Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org

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