Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2013, Vol. 24 ›› Issue (6): 060403 doi: 10.13538/j.1001-8042/nst.2013.06.008

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

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

HU Xiaofang 1,2 ZHAO Lei 1,2,* GAO Xingshun 1,2 LIU Shubin 1,2 AN Qi 1,2   

  1. 1State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China
    2Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China
  • Contact: ZHAO Lei E-mail:zlei@ustc.edu.cn
  • Supported by:

    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) and the Fundamental Research Funds for the Central Universities (WK2030040029).

HU Xiaofang, ZHAO Lei, GAO Xingshun, LIU Shubin, AN Qi. A Prototype of beam position and phase measurement electronics for the LINAC in ADS.Nuclear Science and Techniques, 2013, 24(6): 060403     doi: 10.13538/j.1001-8042/nst.2013.06.008

Abstract:

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 (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 20 μm over a 40 dB dynamic range with the bandwidth of 780 kHz, which is well beyond the application requirements.

Key words: Beam position and phase measurement, RF signal IQ under sampling, Analog-to-digital conversion, ADS