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EAST是全超导托卡马克聚变装置,其极向场和纵场线圈全部采用超导磁体。一旦发生失超,失超保护系统用于确保超导磁体和引线的安全运行。诊断超导线圈电阻电压变化是最直观也是最快捷的技术解决途径,主要难点在于研制高精度的噪声抑制补偿设备,用于抑制实验过程中在诊断信号上产生的大量感应噪声。原先采用模拟电路设计的二次补偿设备存在技术缺陷;而基于DSP技术二次电压补偿设备软硬件结合,大大提高设备精度,通过上位机可以方便实现关键参数与算法更新,经过两年时间,达到初步设计指标,并在近期EAST实验中成功实现并行试运行,下一步升级改造正在进行中。文中主要介绍了数字式二次补偿系统设计思路、补偿原理、以及初步实验测试结果。
EAST is a fully superconducting tokamak fusion device that uses superconducting magnets for both the polar and longitudinal field coils. In the event of quench, the quench protection system is used to ensure the safe operation of the superconducting magnet and lead. Diagnosis of superconducting coil resistance voltage changes is the most intuitive and quickest way to solve the technical problems, the main difficulty lies in the development of high-precision noise suppression compensation equipment used to inhibit the experimental process in the diagnosis of a large number of induced noise signal. The original use of analog circuit design of the secondary compensation device has technical flaws; and DSP-based secondary voltage compensation device hardware and software, greatly improving the accuracy of the device, through the host computer can easily achieve the key parameters and algorithm updates, after two years to reach Preliminary design indicators, and in the recent EAST experiment successfully implemented in parallel test run, the next upgrade is underway. This paper mainly introduces the digital secondary compensation system design ideas, compensation principle, as well as preliminary experimental test results.