The integral experiment on beryllium with D-T neutrons for verification of tritium breeding

Verzilov, Yury; Sato, Satoshi; Ochiai, Kentaro; Wada, M.; Klix, A.; Nishitani, T.

doi:10.1016/j.fusengdes.2005.12.007

Cited by 10 publications

(5 citation statements)

References 9 publications

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“…A 252 Cf neutron source in a cylinder-shaped stainless container (10 mm, 10 mmh) was used for calibration of the NIP. The specific activity and neutron production rate of the source were 1.4×10 4 Bq and 1.6×10 3 n/s, respectively. 252 Cf generates not only fission neutrons but also prompt  rays with an effective energy of 0.88 ± 0.04 MeV [10].…”

Section: Methodsmentioning

confidence: 98%

“…However, it should be emphasized that an experimental examination of tritium breeding performance with spectral neutron fluxes is vital. This is because errors can be caused by uncertainties in the nuclear data, a discrepancy in the simulated and the actual geometries, and an unexpected neutron absorption by impurities in the blanket materials [1]- [4]. Therefore, it is planned to perform a neutronics experiment with a blanket mock-up initially with a cylindrical discharge-type deuterium-deuterium (DD) fusion device [5], [6], and later with a DT neutron source.…”

Section: Introductionmentioning

confidence: 99%

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Preparation for a neutronics experiment using a discharge fusion device and an imaging plate neutron detector

Mukai

Konishi

2019

Fusion Engineering and Design

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Tritium breeding ratio (TBR) is one of the most important parameters determining the tritium self-sufficiency of a deuterium-tritium fusion reactor. A neutronics experiment is planned to measure the spectral neutron fluences two-dimensionally (2D) using a discharge-type compact fusion neutron source and a neutron imaging plate (NIP), respectively. We report a calibration method for the NIP and optimization of the discharge condition to enhance the neutron production rate. A linear relationship between the neutron fluence in the NIP and photostimulated luminescence (PSL) per area was obtained in the range of the neutron fluence from 10 3 to 10 7 n/cm 2 . A neutron production rate higher than 10 7 n/s was successfully achieved by the optimized discharge condition. It is shown that a quantitative 2D measurement by the NIP is feasible using the linear relationship and a correlation coefficient on the energy spectrum.

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Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Preparation for a neutronics experiment using a discharge fusion device and an imaging plate neutron detector

Mukai

Konishi

2019

Fusion Engineering and Design

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“…As its neutron yield is significantly low compared with accelerator-based neutron sources, detectors with ultra-high sensitivity are required [11,12]. One direct method for measuring bred tritium is to count β-rays of irradiated Li 2 CO 3 diagnostic pellets using a liquid scintillation counter (LSC), which evaluates TPR with uncertainties of 4%-10% at the 1σ level [4][5][6][13][14][15]. But, the method is inapplicable for the compact neutron source because the amount of bred tritium would be below the detection limit of LSC with a reasonable operation period.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of tritium production rate in a blanket mock-up using a compact fusion neutron source

et al. 2021

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We report a neutronics study of a blanket mock-up using a discharge-type compact fusion neutron source. Deuterium-deuterium fusion neutrons were irradiated to the mock-ups composed of tritium breeder and neutron reflector/moderator. The tritium production rate (TPR) per source neutron was measured by a single-crystal diamond detector with a 6 Li-enriched lithium fluoride film convertor after the calibration process. Despite the low neutron yield, energetic alpha and triton particles via 6 Li(n, t)α neutron capture as well as 12 C via elastic scattering were successfully detected by the SDD with high signal to noise ratios. The TPRs were experimentally evaluated with errors of 8.4%-8.5% at the 1σ level at the positions with high thermal neutron fluxes where the errors were dominantly introduced by uncertainties in the monitoring of the neutron production rate. The calculated to experimental (C/E) values of TPR were evaluated to be 0.91-1.27 (FENDL-2.1) and 0.94-1.28 (FENDL-3.1). As the neutron source can generate 14 MeV neutrons using a mixed gas of deuterium and tritium, this approach provides more opportunities for blanket neutronics experiments.

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“…The review of this paper was arranged by Senior Editor XXX. (Corresponding author: Keisuke Mukai) campaigns, one dimensional distributions of tritium productions were measured from the activities of the irradiated samples (Li-Pb, Li2CO3, and Li2TiO3) with uncertainties of 4-8% at 1 level [2]- [5]. This method requires a detectable amount of the bred tritium and involves time-consuming processes such as chemical dissolution of the irradiated samples with acids and measurements of -rays from each sample.…”

Section: Introductionmentioning

confidence: 99%

2-D Evaluation of Bred Tritium Using Neutron Imaging Plate

Mukai

Ogino

Yagi

et al. 2020

IEEE Trans. Plasma Sci.

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Tritium breeding performance of a fusion blanket is a key parameter for the self-sufficient fueling of a fusion reactor and thus planned to validate the performance in a neutronics experiment. Measuring the two-dimensional (2D) distribution of bred tritium is challenging via conventional methods such as -ray counting from an irradiated lithium sample by a liquid scintillation counter and a single-crystal diamond detector with a thin 6 LiF film because they are point detectors which require many measurements. In present study, 2D distribution of the low quantity produced tritium was evaluated with a neutron imaging plate with a Gd convertor by estimating the loss of neutrons via a capture reaction by Li. Deuterium-deuterium fusion neutrons were generated using a compact fusion device at an average neutron production rate of 1.5×10 5 n/s by applying high voltages. A neutron image with "shadows" projected by thermal neutron capture reactions of 6 Li(n,) and 10 B(n,) was successfully obtained. The experimentally evaluated values were confirmed to be consistent with the total number of capture reactions calculated using a neutron transport code. The results suggest that the approach could be a facile method for two-dimensional evaluation of bred tritium.

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The integral experiment on beryllium with D-T neutrons for verification of tritium breeding

Cited by 10 publications

References 9 publications

Preparation for a neutronics experiment using a discharge fusion device and an imaging plate neutron detector

Preparation for a neutronics experiment using a discharge fusion device and an imaging plate neutron detector

Evaluation of tritium production rate in a blanket mock-up using a compact fusion neutron source

2-D Evaluation of Bred Tritium Using Neutron Imaging Plate

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