The neutron count rate fluctuation reaches six orders of magnitude between the ohmic plasma scenario and high power of auxiliary heating on an experimental advanced superconducting tokamak(EAST).The mea-surement result of neutron flux monitoring(NFM)is a significant feedback parameter related to the acquisition of radiation protection-related information and rapid fluctua-tions in neutron emission induced by plasma magnetohy-drodynamic activity.Therefore,a wide range and high time resolution are required for the NFM system on EAST.To satisfy these requirements,a digital pulse signal acquisition and processing system with a wide dynamic range and fast response time was developed.The present study was con-ducted using a field-programmable gate array(FPGA)and peripheral component interconnect extension for instru-ment express(PXIe)platform.The digital dual measure-ment modes,which are composed of the pulse-counting mode and AC coupled square integral's Campbelling mode,were designed to expand the measurement range of the signal acquisition and processing system.The time resolution of the signal acquisition and processing system was improved from 10 to 1 ms owing to utilizing high-speed analog-to-digital converters(ADCs),a high-speed PXIe communication with a direct memory access(DMA)mode,and online data preprocessing technology of FPGA.The signal acquisition and processing system was tested experimentally in the EAST radiation field.The test results showed that the time resolution of NFM was improved to 1 ms,and the dynamic range of the neutron counts rate was expanded to more than 106 counts per second.The Campbelling mode was calibrated using a multipoint average linear fitting method;subsequently,the fitting coefficient reached 0.9911.Therefore,the newly developed pulse signal acquisition and processing system ensures that the NFM system meets the requirements of high-parameter experiments conducted on EAST more effectively.

Li Yang;Hong-Rui Cao;Jin-Long Zhao;Zi-Han Zhang;Qiang Li;Guo-Bin Wu;Yong-Qiang Zhang;Guo-Qiang Zhong;Li-Qun Hu;Zi-Jun Zhang

Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China;Hefei University of Technology,Hefei 230009,China

核技术（英文版）

[1]Li Yang;Hong-Rui Cao;Jin-Long Zhao;Zi-Han Zhang;Qiang Li;Guo-Bin Wu;Yong-Qiang Zhang;Guo-Qiang Zhong;Li-Qun Hu;Zi-Jun Zhang-.Development of a wide-range and fast-response digitizing pulse signal acquisition and processing system for neutron flux monitoring on EAST)[J].核技术（英文版）,2022(03):126-136

digitizing,fluctua,magnetohy,Campbelling

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