Test Arrangement for the W7-X HTS-Current Lead Prototype Testing

The Karlsruhe Institute of Technology (which is a merger of former Forschungszentrum Karlsruhe and Karlsruhe University) is responsible for the design, construction and testing of the high temperature superconductor (HTS) current leads for the stellarator Wendelstein 7-X (W7-X) which is presently under construction at the Greifswald branch of the Max-Planck-Institute for Plasma Physics. The current leads are of the binary type, the HTS part covering the temperature range between 4.5 K and 60 K while the heat exchanger covers the range between 60 K and room temperature being cooled by 50 K He. In total 2 prototypes and 14 series current leads are required with a nominal current of 14 kA and a maximum current of 18.2 kA. The paper describes the design and first test results of the prototype HTS current leads.Index Terms-Current leads, fusion magnets, high temperature superconductor, Wendelstein 7-X.

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“…Details of the cryogenic system used during the different test campaigns are described in [10]. The test comprises the following parts:…”

Section: Test Resultsmentioning

confidence: 99%

Test Results of the High Temperature Superconductor Prototype Current Leads for Wendelstein 7-X

Heller

Drotziger

Fietz

et al. 2011

IEEE Trans. Appl. Supercond.

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“…After completion of the prototype current lead manufacturing, two leads were installed in a test cryostat connected with a superconducting short circuit bus bar [12]. The connection is done by clamping using a 100 µm thick Indium foil between the two Au-plated plane copper surfaces of the current lead cold end and the joint box of the short circuit bus bar.…”

Section: Current Leadsmentioning

confidence: 99%

The Superconducting Magnet System of the Stellarator Wendelstein 7-X

Rummel

Riße

Ehrke

et al. 2012

IEEE Trans. Plasma Sci.

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Abstract-The stellarator fusion experimental device Wendelstein 7-X (W7-X) is presently under assembly at the Greifswald branch of the Max-Planck-Institut für Plasmaphysik (IPP), Germany. The superconducting magnet system consists of 50 non planar coils, 20 planar coils, a superconducting bus system and 14 current leads. It is organized in seven electrical circuits with ten coils, the bus system for the interconnection and two current leads each. The magnet system is cooled by supercritical helium. It is enclosed in a cryostat with an outer diameter of 16 meters formed by the plasma vessel and the outer vessel. There are five different types of non planar coils having dimensions of 3.5 x 2.5 x 1.5 meters in maximum and a weight of about 5.5 tons. The two different types of the planar coils are nearly circular coils with a diameter of up to 4.5 meters and a weight of about 3 tons. The superconducting bus bar system connects the coils to each other and provides the connection to the current leads inside the cryostat. All types of coils and the bus system use the W7-X superconductor, a forced flow cable-in-conduit superconductor with 243 copper stabilized NbTi strands with an outer aluminumalloy jacket. The current leads provide the transfer of the electrical current from the room temperature bus bar system outside the cryostat to the superconducting parts inside the cryostat. Their special feature is the upside down orientation with the cold end at the top.

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“…2 shows a simplified sketch of the test setup. Details are described in [4]. The CLs are mounted into a cryostat with the cold end on top.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Investigation of HTS Current Leads Under Pulsed Operation for JT-60SA

Drotziger

Fietz

Heiduk

et al. 2012

IEEE Trans. Appl. Supercond.

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The test of two Wendelstein 7-X (W7-X) prototype high temperature superconductor (HTS) current leads (CL) was extended to dynamic operation, in order to evaluate AC losses in parts of the CL. Trapezoidal and triangular current cycles up to a maximum current of 20 kA with different ramp rates between 0.5 kA/s and 10 kA/s were performed. Temperature changes at the warm end of the HTS-module and the influence on the heat load at the cold end of the CL were studied. Additionally, a DC operation that generates a power loss equivalent to the triangular pulsing run was investigated. AC losses in the low temperature part of the CL are estimated by simplified models and compared to the experimental results of the heat load measurements. The effect of the AC losses on the CL performance is discussed.Index Terms-Current leads, fusion magnets, high temperature superconductors.

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Test Arrangement for the W7-X HTS-Current Lead Prototype Testing

Cited by 12 publications

References 5 publications

Test Results of the High Temperature Superconductor Prototype Current Leads for Wendelstein 7-X

Test Results of the High Temperature Superconductor Prototype Current Leads for Wendelstein 7-X

The Superconducting Magnet System of the Stellarator Wendelstein 7-X

Investigation of HTS Current Leads Under Pulsed Operation for JT-60SA

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