A Prototype of beam position and phase measurement electronics for the LINAC in ADS  

作　　者：HU Xiaofang ZHAO Lei GAO Xingshun LIU Shubin AN Qi 

机构地区：[1]State Key Laboratory of Particle Detection and Electronics,University of Science and Technology of China [2]Department of Modern Physics,University of Science and Technology of China

出　　处：《Nuclear Science and Techniques》2013年第6期87-93,共7页核技术（英文）

基　　金：Supported by the Knowledge Innovation Program of The Chinese Academy of Sciences(KJCX2-YW-N27);the National Natural Science Foundation of China(No.11205153,11185176,and 10875119);the Fundamental Research Funds for the Central Universities(WK2030040029)

摘　　要：This article presents a prototype of beam position and phase measurement(BPPM)electronics designed for the LINAC in China Accelerator Driven Sub-critical system(ADS).The signals received from the Beam Position Monitor(BPM)detectors are narrow pulses with a repetition frequency of 162.5 MHz and a dynamic range more than40 dB.Based on the high-speed high-resolution Analog-to-Digital conversion technique,the input RF signals are directly converted to In-phase and Quadrature-phase(IQ)streams through under-sampling,which simplifies both the analog and digital processing circuits.All signal processing is integrated in one single FPGA,in which real-time beam position,phase and current can be obtained.A series of simulations and tests have been conducted to evaluate the performance.Initial test results indicate that this prototype achieves a phase resolution better than 0.1 degree and a position resolution better than 20μm over a 40 dB dynamic range with the bandwidth of 780 kHz,which is well beyond the application requirements.This article presents a prototype of beam position and phase measurement （BPPM） electronics designed for the LINAC in China Accelerator Driven Sub-critical system （ADS）. The signals received from the Beam Position Monitor （BPM） detectors are narrow pulses with a repetition frequency of 162.5 MHz and a dynamic range more than 40 dB. Based on the high-speed high-resolution Analog-to-Digital conversion technique, the input RF signals are directly converted to In-phase and Quadrature-phase （1Q） streams through under-sampling, which simplifies both the analog and digital processing circuits. All signal processing is integrated in one single FPGA, in which real-time beam position, phase and current can be obtained. A series of simulations and tests have been conducted to evaluate the performance. Initial test results indicate that this prototype achieves a phase resolution better than 0.1 degree and a position resolution better than 20 grn over a 40 dB dynamic range with the bandwidth of 780 kHz, which is well beyond the application requirements.

关 键 词：电子直线加速器 位置检测器 相位测量 ADS 光束 原型 数字转换技术 数字处理电路 

分 类 号：TL53[核科学技术—核技术及应用]