强激光与粒子束, 2014, 26 (7): 075101, 网络出版: 2014-06-30   

BEPCⅡ储存环束团流强测量

Bunch current measurement system for BEPCⅡ storage ring
作者单位
中国科学院 高能物理研究所, 北京 100049
摘要
针对北京正负电子对撞机二期工程(BEPCⅡ)原束团流强测量系统(BCM)不能稳定运行的问题,对系统进行了升级。利用高速ADC对束流位置探头(BPM)信号直接采样,在现场可编程门阵列(FPGA)内进行实时数字信号处理,进而得到加速器储存环内的束团流强值。基于反射内存网络,系统可以实现测量结果高速共享、实时显示。升级后系统实现了更高精度的测量,实时显示精度到0.1 mA,最佳测量精度达到10 μA。通过对系统的触发时钟和算法结构调整,系统实现了长时间的稳定工作,正负电子储存环均实现了对束团流强的均匀性控制,提高了加速器的对撞亮度。
Abstract
The BCM (Bunch Current Measurement) system was developed at BEPCⅡ (Beijing Electron-Positron Collider Ⅱ) for solving the instability. In order to measure the bunch current in accelerator storage rings, the signal of beam position monitor (BPM) was sampled by the high-speed ADC, and the digital signal was processed in field-programmable gate array (FPGA). Based on the reflective memory network, the system realized sharing of the results in high-speed and displayed the results in real-time. The system achieved higher precision, the accuracy of real-time display was 0.1 mA/bucket, and the best measurement resolution reached 10 μA/bucket. Since the trigger and the algorithm structure for system were adjusted, the system realized stably work for a long time, the positron and the negative electron storage ring could control the uniformity of the bunch current, which improved the luminance of accelerator collisions.

邓庆勇, 曹建社, 叶强, 岳军会, 张丛, 王鹏飞. BEPCⅡ储存环束团流强测量[J]. 强激光与粒子束, 2014, 26(7): 075101. Deng Qingyong, Cao Jianshe, Ye Qiang, Yue Junhui, Zhang Cong, Wang Pengfei. Bunch current measurement system for BEPCⅡ storage ring[J]. High Power Laser and Particle Beams, 2014, 26(7): 075101.

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