Time-dependent development of dynamic resistance voltage of superconducting tape considering heat accumulation

Self Cite

High-temperature superconducting (HTS) magnets are promising in the application of high-intensity magnetic field. HTS flux pumps are devices that can charge closed HTS magnets without direct electrical contact. Simulation is an effective way to clarify the physical mechanism and provide further insight into the design of the device. In this work, we propose an accurate and efficient modeling methodology to simulate the transformer-rectifier HTS flux pump, which has considered electromagnetic and thermal coupling. The validity of the model has been verified by experimental results and theoretical calculations. The working characteristics of the HTS flux pump are investigated based on the proposed model, including DC bias component in the charging loop, the voltage recovery delay of the dynamic bridge and the temperature distribution in the dynamic bridge. The simulation results clearly depict working details of the device, in terms of electricity, magnetism and heat. The proposed model can serve as a powerful tool to design the HTS flux pump in practical applications.

Section: Introductionsupporting

confidence: 65%

Modeling methodology for the transformer-rectifier flux pump considering electromagnetic and thermal coupling

Li,

Xin

et al. 2023

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].…”

Section: Introductionmentioning

confidence: 99%

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

Li,

Yang,

et al. 2024

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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.

“…AC fieldcontrolled superconducting switches are effective in charging high-temperature superconducting (HTS) magnets [16,17]. AC field-controlled superconducting switches are based on the dynamic resistance [18], triggered by applying an alternating magnetic field on the HTS tapes carrying a current [19], which has a fast response and recovery [20][21][22][23][24][25]. On the basis of the dynamic resistance, HTS flux pumps have been developed to energize superconducting magnets wirelessly [26][27][28], such as the dynamo-type flux pump [29][30][31][32][33][34][35][36], the linear flux pump [37][38][39][40][41][42][43], the circular type flux pump [44] and the transformerrectifier flux pump [45][46][47][48][49][50][51][52].…”

Section: Introductionmentioning

confidence: 99%

A superconducting switch using induced current in the closed loop circuit

Li,

Xin

et al. 2024

Self Cite

Superconducting magnets have been applied in many fields because of the high magnetic field and the low loss. In order to energize superconducting magnets and operate them in the persistent current mode, the superconducting switch is essential. Recently, a superconducting switch using the interaction between the DC transport current and induced current in a closed loop circuit has been proposed, which cannot only respond fast, but also operate efficiently. In this work, an analytical model based on equivalent circuit is proposed to explain the working principle of this type of superconducting switch. An experimental protype is built to investigate its electromagnetic behaviours and working performance. Impacting factors of the voltage across the superconducting switch have been clarified based on experimental results. The method based on asymmetric AC magnetic field is proposed to enhance the average voltage across the superconducting switch and its performance has been verified through experimental tests. Besides, the advantages and application prospects of the superconducting switch are discussed.