Development of a high-temporal resolution neutron flux measurement system for the HL-2M tokamak

Zhang, Jie; Zhang, Yipo; Zhang, Jinglong; Zhou, Jing; Zhan, Xuwen; Wen, Zhengqi; Cheng, Shikui; Zhu, Y. X.; Yuan, Guoliang; Liu, Yuhang; Yang, Q. W.; Chen, Wei; Shi, Z.B.; Liu, Yi; Xu, M.

doi:10.1088/1748-0221/17/07/p07027

Cited by 5 publications

(2 citation statements)

References 21 publications

(26 reference statements)

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“…As shown in figure 1(a), the basic principle of the double-ring TOF spectrometer involves the scattering of incident neutrons in the S1 scintillator, followed by the detection of the scattered neutrons in the S2 scintillator [19,20]. The recoil protons from the scattering process in the S1 scintillator are converted into photons and detected by a photomultiplier tube (PMT).…”

Section: Principle Of the Dtaamentioning

confidence: 99%

High-precision digital time-amplitude analysis system for the neutron Time-Of-Flight spectrometer in HL-2M

Zhang,

Wu,

et al. 2023

J. Inst.

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Neutron time-of-flight (TOF) spectrometers are widely used for neutron diagnostics in large-scale fusion facilities. However, traditional amplitude and time analysis methods are limited in terms of resolution, flexibility, and other factors. To overcome these limitations, we propose the Digital Time-Amplitude Analysis (DTAA) system, which combines the advantages of both methods by using a high-performance FPGA for real-time time and amplitude analysis of particle pulses. The DTAA system provides accurate timing and pulse shape information, fast processing speed, and low implementation cost. We have also developed a multi-mode data joint time-of-flight correction algorithm and verified its performance through simulation. The DTAA system passed laboratory and tokamak tests, achieving a time measurement precision of 122 ps and accurately measuring neutron counts in tokamak experiments. This work represents a key step towards comprehensive high-performance integrated particle pulse analysis.

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Section: Principle Of the Dtaamentioning

confidence: 99%

High-precision digital time-amplitude analysis system for the neutron Time-Of-Flight spectrometer in HL-2M

Zhang,

Wu,

et al. 2023

J. Inst.

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“…There are two different NFM systems: the one is the ZnS detector, and the other is the 235 U fission chamber. The ZnS detector is a newly developed NFM system with an optimum temporal resolution of 1 µs [29,30]. It is ∼5 m away from the center of HL-2A.…”

Section: Experimental Setupsmentioning

confidence: 99%

Investigation of energetic ion losses induced by long-lived saturated internal mode with energetic particle diagnostics in the HL-2A tokamak

Zhang,

Chen

et al. 2023

Nucl. Fusion

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Several sets of energetic particle diagnostics, including a set of neutron flux monitoring system, a solid-state neutral particle analyzer and a fast ion loss probe, have been used to investigate the energetic ion losses induced by the long-lived saturated internal mode (LLM) in the HL-2A tokamak. Clear experimental evidences for different levels of energetic ion losses induced by LLM, sawtooth and minor disruption have been observed. A numerical calculation for the evolution of neutron emissions was carried out with the FBURN code, and it shows that the neutron emission drop rate linearly increases with the LLM amplitude and no threshold perturbation amplitude exists, illustrating that the loss mechanism for LLM induced energetic ion loss is dominantly convective. In addition, measurement results of the fast ion loss probe demonstrate that LLM tends to expel energetic ions with relatively low energy (E < 27 keV) and high pitch angle (Θ>60°), and can suppress the prompt loss of energetic ions with high energy and low pitch angle to a certain degree. Furthermore, the physical process for LLM induced energetic ion loss can be explained by orbit calculations, which show that LLM induced lost energetic ions will transport from center to peripheral region first, and then get lost out of plasma. The experimental observations are successfully reproduced by calculations using the ORBIT code combined with both the NUBEAM code and the MARS-K code. The paper clearly describes the whole physical process of LLM induced energetic ion loss for the first time in the HL-2A tokamak.

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FPGA implementation of 500-MHz high-count-rate high-time-resolution real-time digital neutron-gamma discrimination for fast liquid detectors

Shen,

Zhang,

Zhang

et al. 2024

NUCL SCI TECH

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Development of a high-temporal resolution neutron flux measurement system for the HL-2M tokamak

Cited by 5 publications

References 21 publications

High-precision digital time-amplitude analysis system for the neutron Time-Of-Flight spectrometer in HL-2M

High-precision digital time-amplitude analysis system for the neutron Time-Of-Flight spectrometer in HL-2M

Investigation of energetic ion losses induced by long-lived saturated internal mode with energetic particle diagnostics in the HL-2A tokamak

FPGA implementation of 500-MHz high-count-rate high-time-resolution real-time digital neutron-gamma discrimination for fast liquid detectors

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