From January 25th to February 6th, an ITER large-scale superconducting feeder system procurement package project undertaken by the Institute of Plasma Physics of the Chinese Academy of Sciences' Hefei Institute of Physical Sciences was re-originated: High-temperature superconducting calibration field coil 10 kA current The lead prototype successfully passed steady state and pulse tests.
The test results show that the 50K helium cooling flow requirement of the high temperature superconducting current leads is about 0.066 g/s/kA, which is better than the ITER design requirement of 0.07 g/s/kA; the 65K high temperature superconducting joint resistance is about 10 nanoohms , better than the design requirements of 25 nanoohms; 5K terminal resistance is less than 1 nanoohm, better than the design requirements of 2.5 nanoohms. Calibrated field coils The prototype of the 10 kA high temperature superconducting current leads successfully passed tests and performance verification, paving the way for the production of high-temperature superconducting current leads. Prof. Wu Songtao from France ITER, Dr. Arnaud Devred, Dr. Seungje.Lee, Dr. Zhou Chao, Prof. Y.Yang from Southampton University, UK, and Dr. Niu Erwu from China Nuclear Fusion Implementation Center witnessed This test.
High-temperature superconducting current leads are a multidisciplinary complex system project involving superconductivity, low temperature, vacuum, measurement and control, power supply, and mechanical processes. ITER calibration field coil 10 thousand high-temperature superconducting current leads are designed by the plasma chamber and Kotech is responsible for processing. Its design involves multi-disciplinary knowledge, needs to meet the requirements of deep cryogenic, high vacuum, high voltage insulation, low heat load, low superconducting joint resistance and other aspects of work requirements, large design and calculation challenges, complex manufacturing processes, high quality level requirements (ITER quality level Level 1 parts). Through the exploration of vacuum brazing, superconducting material welding, electron beam welding technology, complex heat exchanger processing technology, precision assembly and other key process technologies, under the full field quality testimony of IO and its commissioned third-party BV companies, The related technology and quality control personnel of the company and the company have completed the manufacturing and assembly of the components for nearly one year. At the end of December, they were able to reach the low temperature superconductivity testing hall of the plasma lab to prepare for the low temperature electrical performance test.
Under the leadership of the leader concerned, the plasma chamber collaborated with related engineering and technical personnel in the departments of Keju Low Temperature Technology Co., Ltd., No. 2 Chamber, No. 7 Chamber, ITER CODAC and Magnets to complete the first use of real physical signals by ITER. The system completes multi-system integration and debugging such as CODAC interlocking system and traditional CODAC, rapid control, and quench protection system. In order to overcome many difficulties and took two weeks, a total of 9 test items and 34 test items for the calibration field coil prototypes were executed, making this round of low-temperature performance experiments successful. The first-hand experimental data obtained will provide an important reference for the operation of high-temperature superconducting current leads.
In recent years, Plasma has successively completed 13 pairs of EAST 14 kA high temperature superconducting current leads, ITER 10 kA, 52 kA, 68 kA high temperature superconducting current lead test pieces, Russian National Institute of Nuclear Research multiple batches of 12,000 The development task of the 6-ampere high-temperature superconducting current leads and the strong magnetic field 16.5 kA high-temperature superconducting current leads symbolize that the plasma has fully mastered the design, development, manufacture and testing of super-high current capacity high-temperature superconducting current leads. A set of core technologies.
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