3D Modelling and Validation of the Optimal Pitch in Commercial CORC Cables

Abstract

Conductor on a rounded core (CORC®) cables with current densities beyond 300 A/mm-2 at 4.2 K, and a capacity to retain around 90 % of critical current after bending to a diameter of 3.5 cm, make them a strong candidate for high field power applications and magnets. In this paper, we present a full 3D-FEM model based upon the so-called H-formulation for commercial CORC® cables manufactured by Advanced Conductor Technologies LLC. The model presented consists of tapes ranging from 1 up to 3 SuperPower 4mm-width tapes in 1 single layer and at multiple pitch angles. By varying the twist pitch, local electromagnetic characteristics such as the current density distribution along the length and width are visualized. Measurements of macroscopical quantities such as AC-losses are disclosed in comparison with available experimental measurements. We particularly focused on the influence of the twist pitch by comparing the efficiency and performance of multiple cables, critically assessing the optimal twist pitch angle.

Investigating the effect of transverse compressive loads on the electromagnetic performance of superconducting CORC® cables

“…The work on CORC cables [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] is either treating the mechanical, electromagnetic, or critical transport characteristics, lacking a model so far that simultaneously handles mechanical and electromagnetic properties. Consequently, a 3D numerical model of the CORC cable is established based on the T-A formulation and the FE method.…”

“…The mechanical and electromagnetic response of CORC cables has attracted significant attention because of their importance for magnet design and optimization [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. Anvar et al [8] presented finite element (FE) modeling of the stressstrain state of CORC cables and wires under bending loads.…”

“…In addition, also due to the magnetic shielding effect, the magnetization loss per superconducting tape decreases as the number of wound layers increases [17]. Recent studies [18][19][20][21] have also analyzed the electromagnetic behavior of CORC cables in multiple aspects. Wu et al [18] investigated the electromagnetic and mechanical properties of single-layer CORC cables with and without shielding currents.…”

“…Li et al [20] proposed a modified T-A formulation to calculate the losses of cables under different electrical and thermal conditions. Fareed et al [21] conducted a comprehensive study on the twist pitch angle of CORC cables. The optimum pitch was determined from the perspective of AC loss.…”