Experimental Evaluation of the NbTi Inter-Winding Joint for CFETR Central Solenoid Model Coil

Ma, Hongjun; Liu, Huajun; Ma, Guanghui; Liu, Fang; Shi, Yi; Lei, Lei; Zhang, Yanyan

doi:10.1109/tasc.2018.2881669

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…A large difference is observed between the measurement results with and without background magnetic field. For this reason, a measurement was done with a fixed magnetic field amplitude of ±0.4 T and a frequency of 20 mHz in order to verify the effect of offset field on the measured AC loss, see figure 15. The AC loss becomes constant at an offset magnetic field higher than 0.3 T.…”

Section: Resultsmentioning

confidence: 99%

“…For the heat treatment witness wires, the critical current versus applied magnet field is measured using a titanium alloy ITER-type barrel [14] at 4.2 K. For the MgB 2 subsize cable, a 30 kA superconducting transformer test facility [15] is used, as shown in figure 4. The test facility is able to measure the critical current at 4.2 K of a straight cable sample with a maximum length of about 1.2 m. With the primary current ramping from 0 to 150 A at a rate of 0.5 A s −1 , the secondary current can reach up to 30 kA.…”

Section: Measurement Setupsmentioning

confidence: 99%

See 1 more Smart Citation

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

Gao¹,

He²,

Ma³

et al. 2022

Nucl. Fusion

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Given the low price and relatively high transition temperature (39 K) of MgB2 conductor, MgB2-based superconductors are a potential candidate for the lower field fusion coils, such as Poloidal Field (PF) coils, Correction Coils (CC) and Feeders. However, to date, the application of MgB2 is limited to demonstrators in a low magnetic field of up to 5 T and at temperatures of up to 10 to 20 K, relying on cryogen-free, helium gas or liquid hydrogen cooling, which significantly reduce the cost of cryogenic systems. To demonstrate the feasibility and performance verification of large size MgB2 PF conductors based on ITER and CFETR requirements, a 4th-stage subsize MgB2 Cable-In-Conduit Conductor (CICC) cable sample is made at the Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). The CICC contains 96 in-situ MgB2 superconducting wires, manufactured by Western Superconducting Technology Ltd. (WST) and 48 copper wires. The critical current of the sub-size cables and MgB2 witness wires are examined with different background magnetic fields at 4.2 K. In addition, the AC loss is measured utilizing magnetization and calorimetric methods. To further clarify the influence of electromagnetic force on the AC loss performance, the cable sample is pressed transversely at room temperature and then inserted into a dipole magnet for AC loss measurement at 4.2 K. The critical current at 4.2 K of the subsize MgB2 CICC cable shows 20% degradation compared to the witness wires at 2 T background magnetic field. However, no further critical current degradation is visible during ramping up and down the magnetic field. The coupling loss time constant for 1 T background magnetic field amounts to 480 ms. No significant effect of the applied transverse stress on the coupling loss is observed between 0 and 10 MPa.

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Section: Resultsmentioning

confidence: 99%

Section: Measurement Setupsmentioning

confidence: 99%

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

Gao¹,

He²,

Ma³

et al. 2022

Nucl. Fusion

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show abstract

Manufacturing Status of CFETR Central Solenoid Model Coil

Han

Jin

et al. 2020

IEEE Trans. Appl. Supercond.

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Analytical Modeling of the Closed-Loop Operation and Quench Behavior for Superconducting Electrodynamic Suspension Train

Luo³

2022

IEEE Trans. Transp. Electrific.

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Experimental Evaluation of the NbTi Inter-Winding Joint for CFETR Central Solenoid Model Coil

Cited by 3 publications

References 9 publications

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

Manufacturing Status of CFETR Central Solenoid Model Coil

Analytical Modeling of the Closed-Loop Operation and Quench Behavior for Superconducting Electrodynamic Suspension Train

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Experimental Evaluation of the NbTi Inter-Winding Joint for CFETR Central Solenoid Model Coil

Cited by 3 publications

References 9 publications

DC performance and AC loss of sub-size MgB2 CICC conductor for fusion magnet application

DC performance and AC loss of sub-size MgB2 CICC conductor for fusion magnet application

Manufacturing Status of CFETR Central Solenoid Model Coil

Analytical Modeling of the Closed-Loop Operation and Quench Behavior for Superconducting Electrodynamic Suspension Train

Contact Info

Product

Resources

About

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application

DC performance and AC loss of sub-size MgB₂ CICC conductor for fusion magnet application