Analysis on the transverse compression performance of the CORC cable

Self Cite

CORC cables are subject to large transverse compression electromagnetic forces in fusion projects. Unfortunately, the electromagnetic force exceeding its critical transverse compression load will cause an irreversible decrease in its critical current. Therefore, it is particularly important to enhance the critical transverse compression load to ensure that the critical current does not decrease during operation. The winding method of HTS (High tempreture superconducting) tape on the central former is variable. So the experimental study on how to increase the critical transverse compression load of CORC cable by changing the winding method of HTS tape is carried out in this paper. Firstly, the influence law of parameters of the number of HTS tapes per layer and the number of HTS tape layers on their transverse compression performance are analysed independently. The results indicate that increasing the number of HTS tapes per layer and the number of HTS tape layers can both improve the transverse compression performance of CORC cables. Whereas, in the case of a cable with a certain critical current demand (the same total number of HTS tapes), increasing the number of HTS tape layers necessarily reduces the number of HTS tapes per layer. Therefore, in order to compare the degree of influence of the above two parameters, we conducted transverse compression experiments on multiple groups of CORC cables with different winding methods (more layers with few tapes per layer or few layers with more tapes per layer) under the same critical current demand. The results show that under the same critical current demand, choosing the winding method that reduces the number of HTS tape layers and increases the number HTS tapes per layer can effectively improve the transverse compression performance of CORC cables. A 3D multilayer CORC cable transverse compression finite element (FE) model is also established to explain the inherent reasons for the differences in transverse compression performance of CORC cables under different HTS tape winding methods.

Section: Establishment Of Fe Modelmentioning

confidence: 99%

Influence of HTS tape arrangement on the transverse compression performance of copper former CORC cables

Shi,

Ma,

Dai

et al. 2024

Self Cite

“…Owing to rapid development of manufacturing technology, high temperature superconducting (HTS) [1][2][3][4][5] coated conductors have the advantages of high critical magnetic field and strong current carrying capacity in high field magnets [6][7][8]. The conductor on round core (CORC) cable [9][10][11][12][13] wound by HTS tapes is considered as a good candidate for the central solenoid magnet of the tokamak device due to its isotropic infield performance [14], and low AC losses [15][16][17][18][19][20][21]. Tokamak systems that confine a plasma using magnetic fields is a promising way to achieve controllable nuclear fusion [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Numerical study on the electromagnetic characteristics of multi-layer CORC cables

Li,

Yang,

et al. 2024

Due to the high isotropy and low AC losses, the multi-layer conductor on Round Core (CORC) cable is a good candidate for high field magnets, such as central solenoid magnets in fusion. Considering the difficulty in experimental measurement, numerical model is an effective way to illustrate the electromagnetic characteristics of the multi-layer CORC cable and provide further insights into its working performance. In this work, A 3D finite element model based on H formulation is proposed to simulate a CORC cable with as many as 18 layers considering electromagnetic coupling. The validity of the model has been verified by experimental results. Based on the proposed model, the DC transport current distribution characteristics and charge-discharge loss characteristics of multi-layer CORC cables wound in the same and opposite winding directions are investigated respectively. This work can provide an important reference for the design of multi-layer CORC cables for high-current or high-field application.

“…For example, in CFETR (China Fusion Engineering Test Reactor) project and ARC (Affordable, have emerged. Such as TSTC [7][8][9], Roebel [10][11][12], QS-I [13][14][15][16][17], cable on round core (CORC) [18][19][20], etc. Among them, the CORC cable is considered to be one of the best candidates for the fusion project since it is easy to manufacture and has low inductance [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Bending performance of the CORC cable with flexible interlocked stainless steel former

Shi,

Ma,

Dai

et al. 2023

Self Cite

The high temperature superconducting cable on round core (CORC) is a kind of cable that could be used in fusion projects. Nevertheless, conventional copper former CORC cables require a large external force to allow the cable to endure plastic deformation and be tightly wound into solenoids. In this case, the superconducting tape will be affected by concentrated stress, resulting in a risk of critical current degradation. Therefore, this paper proposes a new CORC cable with flexible interlocked stainless steel former, which can be wound into a solenoid by applying a small external force. To verify the bending performance of this interlocked former CORC cable, a double-layer and a ten-layer interlocked stainless steel former CORC cable, as well as a double-layer traditional copper former CORC cable, are fabricated. And these three CORC cables are used to wind solenoids of various radius sizes respectively. The experimental results show that the critical bending radius of the double-layer interlocked stainless steel former CORC cable is less than 20 mm, the critical bending radius of the ten-layer interlocked stainless steel former CORC cable is less than 50 mm, and the critical bending radius of the double-layer traditional copper former CORC cable is larger than 55 mm. A self-consistent finite element model for the critical current of the CORC cable solenoid is also established. And the critical current experimental results are in good agreement with the simulation results. The results of this paper verify the excellent bending performance of the interlocked former CORC cable, which provides a good option for the preparation of insert magnets for future fusion projects.