The Neutron-Gamma Pulse Shape Discrimination Method for Neutron Flux Detection in the ITER

Xu, Xiaodong; Li, Shiping; Cao, Hongchao; Yuan, Guoliang; Qi, Yang; Yin, Zhen‐Qiang

doi:10.1088/1009-0630/15/5/04

Cited by 3 publications

(3 citation statements)

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“…Add a supplement phase β to the reference sine and cosine wave: sin(ω 0 t+θ+β) and cos(2ω 0 t+2θ+ 2β). To make sure the measured amplitudes M 1 and M 2 are stable, the entire adjustment process takes 1 s to finish in FPGA [17]. Figure 3 shows the analysis process of the synchronous demodulation system based on the PCI Express eXtension for Instrumentation (PXIe) bus.…”

Section: Pa Methodsmentioning

confidence: 99%

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Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak

Zhang

Wang

et al. 2018

Plasma Sci. Technol.

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A synchronous demodulation system is proposed and deployed for CO 2 dispersion interferometer on HL-2A, which aims at high plasma density measurements and real-time feedback control. In order to make sure that the demodulator and the interferometer signal are synchronous in phase, a phase adjustment (PA) method has been developed for the demodulation system. The method takes advantages of the field programmable gate array parallel and pipeline process capabilities to carry out high performance and low latency PA. Some experimental results presented show that the PA method is crucial to the synchronous demodulation system and reliable to follow the fast change of the electron density. The system can measure the lineintegrated density with a high precision of 2.0×10 18 m −2 .

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Section: Pa Methodsmentioning

confidence: 99%

“…To make sure the measured amplitudes M 1 and M 2 are stable, the entire adjustment process takes 1 s to finish in FPGA [17].…”

Section: Pa Methodsmentioning

confidence: 99%

Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak

Zhang

Wang

et al. 2018

Plasma Sci. Technol.

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“…As common to-be-measured particles, neutrons usually exist together with γ and other background noises. Thus, n-γ discrimination [7][8][9] becomes an important diagnostic demand in the HL-2M. The shape of the pulse signal can be depicted with many parameters, such as amplitude, rise time and fall time.…”

Section: Introductionmentioning

confidence: 99%

Development of the HL-2M digital pulse analysis system

Pan¹,

Zheng²,

Zhang³

et al. 2019

Plasma Sci. Technol.

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A digital pulse analysis system is an important diagnostic system in nuclear physics experimental research. In response to the demand for reflecting the particle state in a nuclear physics experiment, we have designed and developed a real-time digital pulse analysis system and applied it to the digital nuclear pulse waveform discrimination of different detectors in the HL-2M tokamak. The system is based on the peripheral component interconnect extensions for instrumentation (PXI) platform, while its software was written in LABVIEW. The key technologies involved in the system implementation include digital pulse analysis technology, digital discrimination technology, pulse height analysis technology, etc. The system has been applied to the plastic scintillator detector at the Neutron Source Lab of the University of Science and Technology of China. And the experimental results indicate that the system can discriminate between neutron (n) particles and gamma (γ) particles well when used to measure the plastic scintillator detector.

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Pulse‐Shape Discrimination

2017

Signal Processing for Radiation Detectors

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The GERDA experiment located at the Laboratori Nazionali del Gran Sasso of INFN searches for neutrinoless double beta (0νββ) decay of 76 Ge using germanium diodes as source and detector. In Phase I of the experiment eight semi-coaxial and five BEGe type detectors have been deployed. The latter type is used in this field of research for the first time. All detectors are made from material with enriched 76 Ge fraction. The experimental sensitivity can be improved by analyzing the pulse shape of the detector signals with the aim to reject background events. This Page 2 of 17 Eur. Phys. J. C (2013) 73:2583 paper documents the algorithms developed before the data of Phase I were unblinded. The double escape peak (DEP) and Compton edge events of 2.615 MeV γ rays from 208 Tl decays as well as two-neutrino double beta (2νββ) decays of 76 Ge are used as proxies for 0νββ decay.For BEGe detectors the chosen selection is based on a single pulse shape parameter. It accepts 0.92 ± 0.02 of signal-like events while about 80 % of the background events at Q ββ = 2039 keV are rejected.For semi-coaxial detectors three analyses are developed. The one based on an artificial neural network is used for the search of 0νββ decay. It retains 90 % of DEP events and rejects about half of the events around Q ββ . The 2νββ events have an efficiency of 0.85±0.02 and the one for 0νββ decays is estimated to be 0.90 +0.05 −0.09 . A second analysis uses a likelihood approach trained on Compton edge events. The third approach uses two pulse shape parameters. The latter two methods confirm the classification of the neural network since about 90 % of the data events rejected by the neural network are also removed by both of them. In general, the selection efficiency extracted from DEP events agrees well with those determined from Compton edge events or from 2νββ decays.

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The Neutron-Gamma Pulse Shape Discrimination Method for Neutron Flux Detection in the ITER

Cited by 3 publications

References 8 publications

Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak

Research on the phase adjustment method for dispersion interferometer on HL-2A tokamak

Development of the HL-2M digital pulse analysis system

Pulse‐Shape Discrimination

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