The CEA JOSEFA Test Facility for Subsize Conductors and Joints

Modelling by analytical approach the coupling losses of CICCs used in tokamaks remains a challenge to be reliable. This is usually done using either CPU consuming numerical approaches or heuristic models such as MPAS now used for ITER. Experimental measurements of AC losses are performed at CEA using magnetization method on several JT-60SA TF type samples with various void fractions (25%-36%). Influence of void fraction on coupling losses is hard to heuristically model yet. We choose to develop an experimental protocol in order to measure coupling losses in a range of frequency relevant to fusion operation domain. AC losses model as MPAS is confronted to our JOSEFA experimental data. Conclusion and lessons will be taken into account for future work.

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“…JOSEFA facility [9] is used to measured AC losses generated in large superconducting cables. The method is described below.…”

Section: Experimental Facility : Josefamentioning

confidence: 99%

Void Fraction Influence on CICCs Coupling Losses: Analysis of Experimental Results With MPAS Model

Chiletti

Duchateau

Topin

et al. 2020

IEEE Trans. Appl. Supercond.

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Development of a superconducting transformer for high current conductor testing

Cha

Liu

Shi

et al. 2020

J. Phys.: Conf. Ser.

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Critical current (Ic) tests on superconducting conductors require currents on the order of tens of kilo-amperes in combination with sub-microvolt resolution voltage measurements. Instead of traditional expensive DC power supply and complicated current leads, a superconducting transformer has been developed to feed the test sample with current up to 30 kA. The transformer consists of two concentric layer-wound superconducting solenoids with the primary coil inside the secondary. In order to reduce the influence by stray field of background magnet and transformer, a hall array with two hall sensors symmetrically distributed around the secondary conductor is used to achieve accurate secondary current measurement. This paper describes the design and manufacturing of transformer, including accurate secondary current measurement method. The first test results are also presented. The superconducting transformer system enables fast, high resolution, economic and safe tests of high current conductors.

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

Liu

et al. 2019

IEEE Trans. Appl. Supercond.

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The CEA JOSEFA Test Facility for Subsize Conductors and Joints

Cited by 8 publications

References 3 publications

Void Fraction Influence on CICCs Coupling Losses: Analysis of Experimental Results With MPAS Model

Void Fraction Influence on CICCs Coupling Losses: Analysis of Experimental Results With MPAS Model

Development of a superconducting transformer for high current conductor testing

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

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