Time resolved neutron flux diagnostics for quasi-steady-state operation study of the HT-7 tokamak

Zhu, Y. B.; Chen, Juequan; Li, Guiming

doi:10.1063/1.1789616

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…For detector #3, while using ε γ of 137 Cs, 152 Eu and absolute gamma counting efficiency by MCNP predicted [17], estimated ε n about 20.6% is close to the average neutron efficiency of plastic scintillator [18][19][20]. By neglecting the two orders lower gamma contribution in detectors #1 and #2 compared to 241 Am- 9 Be source, we conclude that average neutron efficiency ε n of detector #2 is about 1.22%, consist with work [12] and the manufacturer's specification; about 6.065% ε n of detector #1 is also reasonable. Shown in figure 3(b) are the ratio of neutron counting efficiency and gamma counting efficiency of three detectors.…”

Section: Bench Tests and Analysissupporting

confidence: 66%

See 1 more Smart Citation

Solid scintillator based neutron fluctuation measurement on EAST tokamak

Pu¹,

Zhu²,

Zhong³

et al. 2015

J. Inst.

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A: Microsecond level fast temporal resolved neutron flux and its fluctuation measurement system based on three types of solid scintillator detectors has been successfully established on the Experimental Advanced Superconducting Tokamak (EAST) for energetic particle (EP) and magnetohydrodynamics (MHD) instabilities relevant studies. The detector #1, where 50mm thick polyethylene is used for neutron thermalization, is mostly sensitive to thermal neutron. The detector #2 and #3 measure fast D-D neutrons directly with different gamma immunity. Design details together with detector test results with three types of radioisotope sources are presented. The system has been successfully implemented in EAST experiments for neutron and gamma identification. Typical fast MHD fluctuation related EAST experimental results from this system is also presented. K: Scintillators and scintillating fibres and light guides; Nuclear instruments and methods for hot plasma diagnostics; Neutron detectors (cold, thermal, fast neutrons); Detector design and construction technologies and materials 1Corresponding author.

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Section: Bench Tests and Analysissupporting

confidence: 66%

“…Laboratory bench tests have been performed on the assembled detectors with similar approach on EAST's predecessor HT-7 [12]. In-vessel calibration is very difficult in the complex multi-shells superconducting environment without an intense neutron source.…”

Section: Bench Tests and Analysismentioning

confidence: 99%

Solid scintillator based neutron fluctuation measurement on EAST tokamak

Pu¹,

Zhu²,

Zhong³

et al. 2015

J. Inst.

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“…The detection efficiency of two 3 He counters with high sensitivity is about 6.0% while that of the 235 U fission chamber is 0.2%. Time resolution of the flux monitor system can be set from 1 ms to 10 ms, generally set to be 5 ms [5] . As for the spectrometer diagnostic system, a BC-501A liquid scintillator detector was used to measure the neutron spectrum and the pulse shape discrimination technology was adopted to distinguish neutrons and γ-rays.…”

Section: Methodsmentioning

confidence: 99%

Measurement of Neutron Flux at the Initial Phase of Discharge in EAST

Zhong¹,

Hu²,

Li³

et al. 2011

Plasma Sci. Technol.

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Neutron emission in EAST was investigated by a time-resolved monitor system which consists of four 3 He proportional counters and a 235 U fission chamber. The D-D neutron flux increased approximately an order of magnitude during the 27 MHz ion-cyclotron radio frequency (ICRF) heating, demonstrating that the ICRF wave heated the plasma effectively. In addition in lower hybrid wave (LHW) experiment with higher plasma parameters D-D neutrons were also detected. However, masses of photoneutrons were generated in Ohmic discharges with low plasma density. Effect of plasma density on the production of photoneutrons was studied, and it is found that LHW can suppress the generation of the runaway electrons and reduce the share of the photoneutrons effectively.

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“…Furthermore, it serves as a vital approach for investigating fast ion transport and energetic particle loss [3,4]. Consequently, neutron yield has been extensively measured in various magnetic confinement devices, including JET [5,6], TFTR [7], JT-60U [8], EAST [9], and LHD [10], among others [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Development of a neutron yield measurement system utilizing BF_3 detectors on the HL-3 tokamak

Wen,

Yuan,

Feng

et al. 2024

J. Inst.

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A neutron yield measurement system, comprising five BF3 proportional counters with excellent n/γ discrimination capabilities, has been meticulously developed and implemented on the HL-3 tokamak to provide time-resolved assessments of neutron emission rates. The size of moderator, optimized for the flat energy responses, was skillfully simulated and designed using the MCNP code. An in-depth analysis of measurement errors stemming from pile-up phenomena determined that the upper limit of the count rate, under the current electronics design, is 131 kcps with a relative error of less than 20%. Drawing from the pulse amplitude spectrum obtained from a 252Cf neutron source and experimentation on the HL-3 tokamak, the amplitude threshold for the BF3 neutron detector systems was judiciously established. Furthermore, it was conclusively affirmed that the neutron yield measurement system possesses the capability to effectively discriminate between neutron and gamma signals. During HL-3 discharges, deuterium-deuterium (DD) neutrons were reliably detected with a temporal resolution of 10 ms, and the variations in neutron count rates was found to be in alignment with the neutral beam injection. Ultimately, the total neutron yield was successfully estimated through the utilization of count rates from four BF3 detectors, thereby validating the robust performance of the neutron yield measurement system.

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Time resolved neutron flux diagnostics for quasi-steady-state operation study of the HT-7 tokamak

Cited by 6 publications

References 9 publications

Solid scintillator based neutron fluctuation measurement on EAST tokamak

Solid scintillator based neutron fluctuation measurement on EAST tokamak

Measurement of Neutron Flux at the Initial Phase of Discharge in EAST

Development of a neutron yield measurement system utilizing BF_3 detectors on the HL-3 tokamak

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