The Qiangguang-I (QG-I ) accelerator can produce high current pulses with rise time of about 100 ns and amplitude of about 2 MA. The load current is usually monitored by self-integrating Rogowski coils. In order to verify the obtained results of the coils, a differential loop with fast response time, relatively simple design, and appropriate performance against electromagnetic noise, has been developed. Calibration experiments show that the differential loop has a response time of about 1. 2 ns, a response frequency range from 10 kHz to 100 MHz, and a sensitivity of 6. 13 × 10-11 (V ? S)/A. The fast response mayhelp to monitor transient variation of the load current related to some rapid physical processes. The differential loop has been tested within short-circuit diode of QG-I accelerator and compared with self-integrating Rogowski coils. The current waveforms obtained through numerical integration of the loop signal exhibit good agreements with those from the coils, with an amplitude deviation less than 10%. Comparison of the results confirms the availability of the loop, and also verifies the reliability of the load current measurements on the accelerator.%“强光一号”加速器能输出上升沿约100 ns、幅值约2 MA的电流脉冲.实验中通常采用自积分式Rogowski线圈监测负载电流.为与该线圈比对校验,研制了一种快响应、结构简单、抗电磁干扰性能较好的微分环.标定实验给出,微分环测量的响应时间约1.2 ns,频谱响应范围10 kHz～100 MHz,灵敏度为6.13×10-11(V· s)/A.其快时间响应将有助于监测与负载物理特性有关的瞬态电流变化.在加速器二极管短路状态对微分环和积分式Rogowski线圈进行了实验比对,数值积分给出的电流波形与后者基本相符,峰值偏差小于10％,表明微分环的设计合理,同时校验了电流测量的可信度.
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