摘要：直流电流传感器(DCCT)的测量精度是高精度直流稳流电源输出电流精度的关键影响因素之一。针对DCCT优于1×10^-5的电流测量精度,本文提出了一种通过用高准确度的直流比较仪(DCC)测量电阻原理设计的校准系统,可实现DCCT 0~400 A测量范围内的高精度校准,且在整个校准范围内系统测量的相对不确定度优于1.1 ppm。通过实验测试DCCT的准确度和线性度验证了整个校准系统的精度,为进一步提高磁铁电源的电流精度提供了保障。

摘要：A superconducting magnet prototype for Accelerator Driven Sub-critical System Injection- I had been designed and fabricated, and tested in a new made vertical Dewar in November 2012. Batch magnet production was processed after some major revision from the magnet prototype, they include： removing off the perm-alloy shield, extending the iron yoke, using thin superconducting wire, etc. The first one of the batch magnets was tested in the vertical Dewar at the Harbin Institute of Technologyin in September 2013. A field measurement was carried out at the same time by the measurement platform that was seated on the top of the vertical Dewar, the measurement results met the design requirements. This paper will present the field measurement system design, measurement results and discussion on the residual field from the persistent current effect.