Modelling of the test of the JT-60SA HTS current leads

Zappatore, Andrea; Heller, R.; Savoldi, Laura; Zanino, Roberto

doi:10.1016/j.cryogenics.2017.06.001

Cited by 4 publications

(3 citation statements)

References 15 publications

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“…On the other hand, the connection to the infrastructure like the water-cooled cables influences the performance as well. More detailed simulations of the CL performance both in steady state and in pulse operation where the interfaces to the infrastructure are included are in [16].…”

Section: Discussionmentioning

confidence: 99%

“…There is a good agreement between experimental data and calculation. Details on the contributions of the additional heat load caused by thermal conduction of the vacuum shell of the CL to the heat load at 4.5 K can be found in [16]. The steady state current operation was executed for 10, 14, 16, 18 and finally 20 kA with a stepwise increase.…”

Section: Heat Load Measurements At 45 K Without Current For Different...mentioning

confidence: 99%

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Test results of a 20 kA high temperature superconductor current lead using REBCO tapes

Heller

Fietz

Gröner

et al. 2018

Supercond. Sci. Technol.

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The Karlsruhe Institute of Technology has developed a 20 kA high temperature superconductor (HTS) current lead (CL) using the second generation material REBCO, as industry worldwide concentrate on the production of this material. The aim was to demonstrate the possibility of replacing the Bi-2223/AgAu tapes by REBCO tapes, while for easy comparison of results, all other components are copies of the 20 kA HTS CL manufactured for the satellite tokamak JT-60SA. After the manufacture of all CL components including the newly developed REBCO module, the assembly of the CL has been executed at KIT and an experiment has been carried out in the CuLTKa test facility where the REBCO CL was installed and connected to a JT-60SA CL via a superconducting bus bar. The experiment covers steady state operation up to 20 kA, pulsed operation, measurement of the heat load at 4.5 K end, loss-of-flow-accident simulations, and quench performance studies. Here the results of these tests are reported and directly compared to those of the JT-60SA CL.

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Section: Discussionmentioning

confidence: 99%

Section: Heat Load Measurements At 45 K Without Current For Different...mentioning

confidence: 99%

Test results of a 20 kA high temperature superconductor current lead using REBCO tapes

Heller

Fietz

Gröner

et al. 2018

Supercond. Sci. Technol.

Self Cite

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show abstract

“…This method is implemented afterwards to evaluate the leads' performance under different cooling options [37,38] and simulate the loss of flow accident [39]. Second, a thermal-hydraulic CURLEAD code based on the finite difference method (FDM) initially developed by KIT [40] has been applied to predict the operating parameters of kA-class binary current leads in steady mode [41,42] and pulsed mode [43,44]. Third, 2D and 3D models developed by the finite element method are also deployed to obtain detailed local thermal and magnetic field distributions of the final design before fabrication [33,[45][46][47].…”

Section: Introductionmentioning

confidence: 99%

The design of YBCO binary current leads and its electromagnetic-thermal coupling analysis based on PEEC and finite volume method

Zheng

Liu

Song

et al. 2023

Supercond. Sci. Technol.

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A superconducting magnet system is developed for the application of high frequency gyrotrons at XXX. The operation cost for the magnet is dominated by refrigeration power. To reduce the heat load for cryogenic system, a pair of YBCO binary current leads is designed in consideration of the industrial concentration on type II high temperature superconducting (HTS) YBCO material. In this paper, a simulation model is proposed to perform the electromagnetic-thermal coupling analysis of these YBCO binary leads under different operation conditions by combining Partial Element Equivalent Circuit (PEEC) method and Finite Volume Method (FVM). The simulation code can improve computational efficiency and enable high-accuracy coupling between the electromagnetic field and heat transfer process. Under steady state, the heat leakage at 4.2 K cold end of YBCO binary leads depends mainly on the geometric parameters of YBCO tape, especially the cross-sectional area of the copper layer in YBCO tape. The cooling mode and liquid helium level also have a significant impact on the heat leakage level. The optimal outer diameter of the normal copper section is identified, and the optimum value is largely influenced by the effective cooling power imposed on the cold end of the normal copper section. Under transient state, the simulation for charging process and the loss of cooling accident are performed, along with the detailed analysis of the electromagnetic-thermal response features of the leads under these conditions. The results indicate that the YBCO binary current leads possess high thermal stability and an ample time margin for the magnet system to be demagnetized.

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Assessment of the performance of a 20 kA REBCO current lead

et al. 2018

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Modelling of the test of the JT-60SA HTS current leads

Cited by 4 publications

References 15 publications

Test results of a 20 kA high temperature superconductor current lead using REBCO tapes

Test results of a 20 kA high temperature superconductor current lead using REBCO tapes

The design of YBCO binary current leads and its electromagnetic-thermal coupling analysis based on PEEC and finite volume method

Assessment of the performance of a 20 kA REBCO current lead

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Modelling of the test of the JT-60SA HTS current leads

Cited by 4 publications

References 15 publications

Test results of a 20 kA high temperature superconductor current lead using REBCO tapes

Test results of a 20 kA high temperature superconductor current lead using REBCO tapes

The design of YBCO binary current leads and its electromagnetic-thermal coupling analysis based on PEEC and finite volume method

Assessment of the performance of a 20 kA REBCO current lead

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Product

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Assessment of the performance of a 20 kA REBCO current lead