A multichannel gated neutron detector with reduced afterpulse for low-yield neutron measurements in intense hard X-ray backgrounds

Abe, Yuki; Nakajima, N.; Sakaguchi, Yoshifumi; Arikawa, Yasunobu; Mirfayzi, S. R.; Fujioka, Shinsuke; Taguchi, Toshihiro; Mima, K.; Yogo, Akifumi; Nishimura, Hiroaki; Shiraga, H.; Nakai, M.

doi:10.1063/1.5039436

Cited by 5 publications

(5 citation statements)

References 28 publications

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“…However, for high-energy laser experiments, the capacitor may be completely discharged in several to dozens of µs, causing the ETG to shut down earlier than the set time. As reported in [25], a high-speed ETG can provide a switching time of less than 100 ns by using a 10 nF capacitor (C2 in Ref. [25]).…”

Section: Introductionmentioning

confidence: 97%

“…As reported in [25], a high-speed ETG can provide a switching time of less than 100 ns by using a 10 nF capacitor (C2 in Ref. [25]). This design enables the detection of fast neutrons in high-energy laser experiments.…”

Section: Introductionmentioning

confidence: 97%

“…To cut off the X-ray signal, some time-gated neutron detectors have been developed [23][24][25] for neutron detection. A customized electrical time-gating (ETG) system has been coupled with a PMT to stop the multiplication of electrons during a specific period by applying a reverse bias on the dynodes of the PMT [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

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Development of a Time-Gated Epithermal Neutron Spectrometer for Resonance Absorption Measurements Driven by a High-Intensity Laser

Lan,

Arikawa,

Abe

et al. 2024

QuBS

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The advance of laser-driven neutron sources (LDNSs) has enabled neutron resonance spectroscopy to be performed with a single shot of a laser. In this study, we describe a detection system of epithermal (∼eV) neutrons especially designed for neutron resonance spectroscopy. A time-gated photomultiplier tube (PMT) with a high cut-off ratio was introduced for epithermal neutron detection in a high-power laser experiment at the Institute of Laser Engineering, Osaka University. We successfully reduced the PMT response to the intense hard X-ray generated as a result of the interaction between laser light and the target material. A time-gated circuit was designed to turn off the response of the PMT during the laser pulse and resume recording the signal when neutrons arrive. The time-gated PMT was coupled with a 6Li glass scintillator, serving as a time-of-flight (TOF) detector to measure the neutron resonance absorption values of 182W and 109Ag in a laser-driven epithermal neutron generation experiment. The neutron resonance peaks at 4.15 eV of 182W and 5.19 eV of 109Ag were detected after a single pulse of laser at a distance of 1.07 m.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

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Development of a Time-Gated Epithermal Neutron Spectrometer for Resonance Absorption Measurements Driven by a High-Intensity Laser

Lan,

Arikawa,

Abe

et al. 2024

QuBS

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show abstract

“…The nuclear reactions of neutrons and ions with surrounding materials induce gamma-ray emissions, which can saturate and destabilize the detector output signal and cause after-pulsing in photomultiplier tubes (PMTs) 26 . A PMT with gated voltage can reduce the impact of the flash signals [27][28][29] . Neutron resonance transmission experiments using LDNSs have been reported [30][31][32] .…”

Section: Introductionmentioning

confidence: 99%

Demonstration of Shape Analysis of Neutron Resonance Transmission Spectrum Measured with a Laser-driven Neutron Source

Koizumi,

Ito,

Lee

et al. 2024

Preprint

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Laser-driven neutron sources (LDNSs) can generate strong short-pulse neutron beams, which are valuable for scientific studies and engineering applications. Neutron resonance transmission analysis (NRTA) is a nondestructive assay method for determining the areal density of each nuclide in a material sample using pulsed thermal and epithermal neutrons. An experiment demonstrating resonance-transition-spectrum measurement was conducted using an LDNS driven by the Laser for Fast Ignition Experiment at the Institute of Laser Engineering, Osaka University. A 6Li glass scintillation neutron detector with a gating circuit was placed 3.6 m from the LDNS. The output waveforms from the neutron detector were recorded and analyzed offline using the counting method. A resonance spectrum was extracted from only the data of three laser shots using a 115In and 109Ag plate sample. A simulated spectrum reproduced the experimental spectrum shapes. Shape analysis of the obtained spectrum was performed, and the fitting results reproduced the experimental parameters. These results indicate the applicability of an LDNS to NRTA for nondestructive material analysis.

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“…The electron-ion energy spectrometer (ESM) [8] and the Mandala neutron time-of-flight analyzer (Mandala) [9] are used to estimate the deposited energy of electrons and ions, which contribute to the heating. The results are compared with the absorbed energy obtained from areal density (ρR) and x-ray measurement [10].…”

Section: Introductionmentioning

confidence: 99%

Hot electron and ion spectra on blow-off plasma free target in GXII-LFEX direct fast ignition experiment

et al. 2023

Self Cite

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Polystyrene deuteride shell targets with two holes were imploded by the Gekko XII laser and additionally heated by the LFEX laser in a direct fast ignition experiment. In general, when an ultra-intense laser is injected into a blow-off plasma created by the imploding laser, electrons are generated far from the target core and the energies of electrons increase because the electron acceleration distance has been extended. The blow-off plasma moves not only to the vertical direction but to the lateral direction against the target surface. In a shell target with holes, a lower effective electron temperature can be realized by reducing the inflow of the implosion plasma onto the LFEX path, and high coupling efficiency can be expected. The energies of hot electrons and ions absorbed into the target core were calculated from the energy spectra using three electron energy spectrometers and a neutron time-of-flight measurement system, Mandala. The ions have a large contribution of 74% (electron heating of 4.9 J and ion heating of 14.1 J) to target heating in direct fast ignition.

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A multichannel gated neutron detector with reduced afterpulse for low-yield neutron measurements in intense hard X-ray backgrounds

Cited by 5 publications

References 28 publications

Development of a Time-Gated Epithermal Neutron Spectrometer for Resonance Absorption Measurements Driven by a High-Intensity Laser

Development of a Time-Gated Epithermal Neutron Spectrometer for Resonance Absorption Measurements Driven by a High-Intensity Laser

Demonstration of Shape Analysis of Neutron Resonance Transmission Spectrum Measured with a Laser-driven Neutron Source

Hot electron and ion spectra on blow-off plasma free target in GXII-LFEX direct fast ignition experiment

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