Calibration and Unfolding of the Pulse Height Spectra of Liquid Scintillator-Based Neutron Detectors Using Photon Sources

Xie, Xu; Yuan, Xing; Zhang, Xing; Tieshuan, Fan; Chen, Jinxiang; Li, Xiangqing

doi:10.1088/1009-0630/14/6/27

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…In addition, there is a great number of event counts in a low energy range of the recoil proton spectra due to inten sive scattering of neutrons. There are two codes (GRAVEL, MAXED) used to unfold the recoil proton spectrum, which are based on the deconvolu tion method and the detector response function [13]. These unfolding spectra are shown in figure 5.…”

Section: Icrf Minority Heatingmentioning

confidence: 99%

The behavior of neutron emissions during ICRF minority heating of plasma at EAST

Zhong

Cao

et al. 2016

Plasma Phys. Control. Fusion

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Ion cyclotron radio frequency (ICRF) wave heating is a primary method to heat ions in the Experimental Advanced Superconducting Tokamak (EAST). Through neutron diagnostics, effective ion heating was observed in hydrogenminority heating (MH) scenarios. At present, investigation of deuterium-deuterium (DD) fusion neutrons is mostly based on time resolved flux monitor and spectrometer measurements. When the ICRF was applied, the neutron intensity became one order higher. The H/H + D ratio was in the range of 5-10%, corresponding to the hydrogen MH dominated scenario, and a strong high energy tail was not displayed on the neutron spectrum that was measured by a liquid scintillator. Moreover, ion temperature in the plasma center (T i ) was inversely calculated by the use of neutron source strength (S n ) and the plasma density based on classical fusion reaction equations. This result indicates that T i increases by approximately 30% in Lmode plasma, and by more than 50% in Hmode plasma during ICRF heating, which shows good agreement with xray crystal spectrometer (XCS) diagnostics. Finally, the DD neutron source strength scaling law, with regard to plasma current (I P ) and ICRF coupling power (P RF ) on the typical minority heating condition, was obtained by statistical analysis.

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Section: Icrf Minority Heatingmentioning

confidence: 99%

The behavior of neutron emissions during ICRF minority heating of plasma at EAST

Zhong

Cao

et al. 2016

Plasma Phys. Control. Fusion

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“…The common method of exploiting this property in scintillation detectors is a pulse shape discrimination (PSD) circuit. [6][7][8].…”

Section: Neutron/gamma Discriminationmentioning

confidence: 99%

A detailed study of the high energy neutron flux (15-20 MeV) at NCSR “Demokritos” using a BC501A liquid scintillator

Mitsi

Chasapoglou

Kalamara

et al. 2020

hnps

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The current study was carried out for neutron beam energies ranging between 14.8 and 19.2 MeV using the 3H(d,n)4He reaction and included neutron/gamma discrimination and neutron monitoring utilizing a BC501A liquid scintillator, followed by a pulse shape discrimination-capable circuit. Tests were conducted in order to determine the characteristics and limitations of the employed experimental setup. The deconvolution of the acquired spectra was performed using the DIFBAS computer code. The algorithm is based on the Bayesian conditional probability,whilethe covariance filter method was employed to calculate the a posteriori neutron flux spectrum along with its covariance matrix.The produced neutron beam proved to be practically monoenergetic for low energy deuterons, while at higher deuteron beam energies, the strong presence of parasitic and scattered neutrons was revealed.

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“…Continuous digital data acquisition was employed and the continuous 1 GSamples/s raw data with the total time length of 1 s were streamed into a PC. The data were analyzed offline with a threshold of −0.2 V for each individual pulse, corresponding to the equivalent electron energy of about 0.2 MeV ee and neutron energy of 0.96 MeV (with the calibration results from γ -ray measurements 22 ). Totally 250 samples were saved for each pulse, with 60 samples before the trigger point.…”

Section: A Time Tracementioning

confidence: 99%

Neutron emission measurement at the HL-2A tokamak device with a liquid scintillation detector

Xie

Chen

et al. 2014

Review of Scientific Instruments

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Neutron emission measurement at the HL-2A tokamak device with a liquid scintillation detector is described. The detector was placed at a location with little structure material in the field of view, and equipped with a gain monitoring system which could provide the possibility to evaluate the gain variation as well as to correct for the detector response. Time trace of the neutron emissivity was obtained and it was consistent with the result of a standard (235)U fission chamber. During the plasma discharge the neutron yield could vary by about four orders of magnitude and the fluctuation of the detector gain was up to about 6%. Pulse height spectrum of the liquid scintillation detector was constructed and corrected with the aid of the gain monitoring system, and the correction was found to be essential for the assessment of the neutron energy spectrum. This successful measurement offered experience and confidence for the application of liquid scintillation detectors in the upcoming neutron camera system.

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Calibration and Unfolding of the Pulse Height Spectra of Liquid Scintillator-Based Neutron Detectors Using Photon Sources

Cited by 10 publications

References 12 publications

The behavior of neutron emissions during ICRF minority heating of plasma at EAST

The behavior of neutron emissions during ICRF minority heating of plasma at EAST

A detailed study of the high energy neutron flux (15-20 MeV) at NCSR “Demokritos” using a BC501A liquid scintillator

Neutron emission measurement at the HL-2A tokamak device with a liquid scintillation detector

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