Abstract
In order to achieve the real-time neutron flux monitoring in the presence of high-level mixed neutrons and background rays, a Field Programmable Gate Array (FPGA)-based Automatic Gain Control Digital Time-division Integrator (AGCDTI) is employed for Neutron Flux Monitor (NFM) in International Thermonuclear Experimental Reactor (ITER). With Campbelling technique and digital time-division integration, AGCDTI can obtain the time evolution of the Campbell integral value, which is proportional to the neutron flux. And an auto gain controller is applied to increase the dynamic range and quantization precision of the count rate. In addition, the high background rays-inhibiting ability of AGCDTI can also be implemented via the combination of a blank chamber and a fission chamber. The experimental results show that the temporal resolution of AGCDTI can reach 0.1 ms, and its wide gain range is from −11.5 to 20 dB with the gain step being approximately 0.49 dB. Furthermore, AGCDTI can provide a wide linear dynamic range of count rate from 5×103 to 1.22×109 cps through the automatic gain control. These excellent performances demonstrate that AGCDTI can realize the anticipated goals of NFM perfectly. It will not only help to control, evaluate, and optimize plasma performance in ITER but also have potential applications wherever high-level mixed radiation fields need to be investigated, such as nuclear power stations, medical applications, and particle accelerators, and so on.
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Acknowledgment
The authors would like to acknowledge the support of State Key Laboratory of Particle Detection & Electronics and the supported of ITER Plan National Major Project (2008GB109000).
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Shiping, L., Xiufeng, X., Hongrui, C., Zejie, Y., Guoliang, Y., Qingwei, Y. (2014). An Automatic Gain Control Digital Time-Division Integrator for NFM in ITER Utilizing Campbelling Technique. In: Xing, S., Chen, S., Wei, Z., Xia, J. (eds) Unifying Electrical Engineering and Electronics Engineering. Lecture Notes in Electrical Engineering, vol 238. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-4981-2_38
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DOI: https://doi.org/10.1007/978-1-4614-4981-2_38
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