author：Yan ping Wu
Recently, good news came from Keju Cryogenic Low Temperature: during the power-on test conducted by our testing department's operations team, the CRAFT high-temperature superconducting current lead independently developed by the Institute of Plasma Physics has successfully completed performance testing under extreme working conditions. This breakthrough achievement is not only an important progress in the field of scientific research, but also marks a significant contribution to the research on fusion energy in China.
Testing high-temperature superconducting current leads is extraordinarily significant. It involves interdisciplinary knowledge in superconductivity, low temperature, vacuum, mechanical technology, measurement and control, power supply, and other aspects, and undertakes the key task of connecting room temperature power supply with high current superconducting magnets. Due to its special location, operates across a temperature gradient from room temperature to ultra-low temperatures (4.2K)", the performance of the current lead directly affects the operational efficiency and stability of the entire fusion device. Testing it is an important step in verifying its performance and ensuring the reliable operation of the device.
This test yielded exciting results: the CRAFT 100kA high-temperature superconducting current lead helium cooling flow rate at 50K was approximately 6.5 g/; 5K end connector resistance 0.4 n Ω; LOFA duration of 9 minutes; overheating safety margin of 27 seconds. All performance indicators have significantly exceeded the design requirements, successfully achieving a new record of steady-state operation with a current carrying capacity of 100KA. The achievement of this outstanding result is inseparable from the professional and accurate testing work of the operation team of the low-temperature testing department of Keju Cryogenic, who provided reliable guarantees for the comprehensive presentation of the performance of the current lead.
The successful testing of 100kA high-temperature superconducting current lead is of great significance. It not only achieved a new breakthrough in the steady-state operation of 100KA current, but also laid a solid testing foundation for the subsequent testing of superconducting magnet systems in large-scale fusion devices, and provided strong support for the construction and operation of superconducting magnet systems in large-scale fusion devices. The professional ability demonstrated by Keju Cryogenic Low Temperature in this test has also accumulated valuable experience in the relevant testing field.