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ASIPP successfully qualified first TF Conductor sample

-Yu Wu, ASIPP

TF cable before final stainless steel wrapping (Click to view larger version...)
TF cable before final stainless steel wrapping
Compaction machine at ASIPP for conductor jacketing (Click to view larger version...)
Compaction machine at ASIPP for conductor jacketing
Cross-sectional view of conductor tested in SULTAN (Click to view larger version...)
Cross-sectional view of conductor tested in SULTAN
China's first TF Conductor sample (TFCN1) was successfully tested at the SULTAN test facility in Switzerland. The sample exhibited good and stable performances with a current sharing temperature of the order of 6.9 K at 68 kA and a background field of 10.78 T, even after 950 energization cycles.

These current sharing temperatures, which determine the operating margin of the magnet, are among the highest ever recorded on TF conductor samples at SULTAN and qualify the strand type and the cable/jacket design and process combination that were used to manufacture the sample. This performance qualification is a pre-requisite to the execution of the Procurement Arrangement and will enable CN-DA to launch the production of its 7.5% share of the TF Conductor (corresponding to 5 Regular, 760 m long and 5 Side, 415 m long Double Pancake unit lengths).

The Institute of Plasma Physics of the Chinese Academy of Sciences (ASIPP), located in Hefei, has taken charge of the ITER superconductor technology development in China based on the technologies developed during the construction of the EAST superconducting Tokamak. Cooperating with leading institutes and companies throughout China and in close collaboration with the ITER Organization, ASIPP has succeeded in developing a baseline technology for ITER TF conductor manufacture.

The TF conductor for the SULTAN sample was produced in 2008, and was shipped to Sultan in October 2008. The Cr-plated Nb3Sn strands and Cr-plated Cu strands for TFCN1 were supplied by OST. The cable was manufactured by Baosheng Science and Technology Innovation INC. The austenitic stainless steel tube for the jacket was produced by Baoshan Iron & Steel Co., Ltd, while cable insertion and conductor compaction were carried out by ASIPP. Conductor sample heat treatment, assembly and instrumentation were carried out at Sultan.


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