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我们对计划中的磁镜核聚变试验装置(MFTF)和高磁场试验装置(HFTF)用的典型导体接头作了大量的机械性能和电性能测量。为了进行这种测量,我们使用一种工业用的冷压焊机。对于MFTF用低铜比超导体接头,其强度接近原导体的强度。对于HFTF用的铜超比为4.33:1的导体,其接头强度高于导体的强度。就电性能来说,这些接头不是超导的(我们在高达8万场强下测量了电阻)。电阻值虽然高于用别的焊接方式可能达到的电阻值,但我们认为,冷压焊接具有简单、快、可靠、重复性好等优点。这一点使得该方法对MFTF有吸引力。在MFTF中,电阻损耗与4K致冷的总要求比起来是很小的。
We have extensive mechanical and electrical performance measurements on the planned typical MFTF (Magnetic Fusion Test Set) and high-F test (HFTF) conductor joints. To make this measurement, we use an industrial cold press welder. For MFTF low copper ratio superconductor joints, the strength of the original conductor close to the strength. For HFTF with copper excess ratio of 4.33: 1 conductor, the joint strength is higher than the strength of the conductor. In terms of electrical properties, these joints are not superconducting (we measured the resistance at up to 80,000 field strengths). Although the resistance value is higher than the resistance value that can be achieved by other welding methods, we think that the cold-pressed welding has the advantages of simple, fast, reliable and good repeatability. This makes this approach attractive to MFTF. In MFTF, the resistance loss is small compared to the total requirement of 4K cooling.