Xiaofang HU, Lei ZHAO, Xingshun GAO, et al. A Prototype of beam position and phase measurement electronics for the LINAC in ADS. [J]. Nuclear Science and Techniques 24(6):060403(2013)
Xiaofang HU, Lei ZHAO, Xingshun GAO, et al. A Prototype of beam position and phase measurement electronics for the LINAC in ADS. [J]. Nuclear Science and Techniques 24(6):060403(2013) DOI： 10.13538/j.1001-8042/nst.2013.06.008.
A Prototype of beam position and phase measurement electronics for the LINAC in ADS
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.
Beam position and phase measurementRF signal IQ under samplingAnalog-to-digital conversionADS
Zhao Z, Xia H. Eng Sci, 2008, 10: 66-72.
Peter F, Piotr K, Dmitry L. Beam position monitors, CERN accelerator school on beam diagnostics, 2008, 187-228.
Zhao L, Liu S, Tang S, et al. IEEE Trans Nucl Sci, 2010, 57: 533-538.
Zhou H, Liu S, Zhao L, et al. ICEMI. 2009, 5273995: Design of the fully digital beam position monitor for beam position measurement in SSRF. 9th Int. conference electronic measurement & instruments, Beijing, China, Aug, 2009, 1045-1051.
Gu P, Geng Z, Pei G, et al. RF phasing system for BEPCII linac. 3rd Asian particle accelerator conference, Gyeongju, Korea, March 2004, 288-290.
Geng Z, Gu P, Hou M, et al. PAC. 2005, 1591798: Design and calibration of a phase and amplitude detector. Particle Accelerator Conference, Knoxville, TN, United states, May 2005, 1-3.
Sabah S, Lorenz R. Design and calibration of IQ-mixers. 6th European particle accelerator conference, Stockholm, Sweden, Jun 1998, 1589-1591.
Power J F, Gilpatrick J D, Stettler M W. Design of A VXI module for beam phase and energy measurements for LEDA. proceedings of the 1997 17th particle accelerator conference, Vancouver, BC, CAN, May 1997, 2041-2043.
Power J, Stettler M. The design and initial testing of a beam phase and energy measurement for LEDA. 8th beam instrumentation workshop (BIW 98), STANFORD, CA, MAY 1998, 459-466.
Power J, O'Hara J, Kurennoy S, et al. PAC.2001.986685: Beam position monitors for the SNS LINAC. Particle accelerator conference, 2001, Chicago, IL, June 2001, 1375-1377.
Harald K. IEEE Trans Instrum Meas, 2005, 54: 1209-1213.
Tang S, Zhao L, Liu S, et al. IEEE Trans Instrum Meas, 2012, 61: 2870-2878.
Vaughan R G, Scott N L, White D R. IEEE Trans Signal Process, 1991, 39: 1973-1984.