Neutronics Analysis on the Beam Optics from Cylindrical Discharge Type Fusion Device

Matsui, Naoya; Maegawa, T.; Noborio, Kazuyuki; Kasada, Ryuta; Yamämoto, Yasushi; Konishi, Satoshi

doi:10.13182/fst13-a19173

Cited by 4 publications

(2 citation statements)

References 1 publication

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“…Opportunely, the spectrum of neutron and γ ray penetrating different structure and component of the material can be calculated by MCNP. 5,6 GA was applied on the investigation for seeking the optimal solutions. 7 In R. C. Souza's investigation, GA was adopted on the multilayer shield design.…”

Section: Introductionmentioning

confidence: 99%

The “neutron channel design”—A method for gaining the desired neutrons

Wang

et al. 2016

AIP Advances

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The neutrons with desired parameters can be obtained after initial neutrons penetrating various structure and component of the material. A novel method, the “neutron channel design”, is proposed in this investigation for gaining the desired neutrons. It is established by employing genetic algorithm (GA) combining with Monte Carlo software. This method is verified by obtaining 0.01eV to 1.0eV neutrons from the Compact Accelerator-driven Neutron Source (CANS). One layer polyethylene (PE) moderator was designed and installed behind the beryllium target in CANS. The simulations and the experiment for detection the neutrons were carried out. The neutron spectrum at 500cm from the PE moderator was simulated by MCNP and PHITS software. The counts of 0.01eV to 1.0eV neutrons were simulated by MCNP and detected by the thermal neutron detector in the experiment. These data were compared and analyzed. Then this method is researched on designing the complex structure of PE and the composite material consisting of PE, lead and zirconium dioxide.

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Section: Introductionmentioning

confidence: 99%

The “neutron channel design”—A method for gaining the desired neutrons

Wang

et al. 2016

AIP Advances

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“…We have tried to increase the reaction rate by coating the electrodes with hydrogen absorption materials such as titanium [9]. This concept is being developed as a neutron "beam" generator by using a cylindrical variation with reflectors and moderators [10][11][12]. However, the existing experimental machine, consisting of a grounded chamber and negatively biased cathode, has some problems; namely, unstable and inaccurate cathode support, undesirable discharge between the cathode and chamber wall, and overheating of the cathode after long operation.…”

mentioning

confidence: 99%

Optimizing the Electrode Configuration of a Cylindrical Discharge-Type Fusion Device by Computational and Experimental Analysis

Noborio

Yamämoto

Konishi

2014

Plasma and Fusion Research

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A new design of a cylindrical discharge-type fusion device is proposed to achieve the precise alignment of components and prevent abnormal discharges. Cylindrical insulators that act as parts of the vacuum boundary and fix the relative position between cathode and anodes were used. The configuration of the electrodes was optimized to maintain stable discharge at low pressures and high discharge voltages, which enhances the neutron yield. The optimization was performed via analysis of the electric field and ion movements by developing a 2D code, and the results were experimentally verified. The results show that grounding the anodes is better for stable discharge at lower pressures. The optimized combination of the anode height and cathode overhang is 3 cm and 1 cm, or 2 cm, respectively. The discharge characteristics and neutron production rate were then experimentally measured for the optimized configuration. The attained highest discharge voltage (instantaneous) was ∼50 kV and the neutron production rate of 3 × 10 4 n/s was obtained by continuous discharge with an applied voltage of 30 kV and discharge current of 30 mA.

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Nondestructive and active interrogation system for special nuclear material: proof of principle and initial results

Bakr,

Masuda,

Takahashi

et al. 2024

NUCL SCI TECH

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Herein, we employ the threshold energy neutron analysis (TENA) technique to introduce the world's first active interrogation system to detect special nuclear materials (SNMs), including U-235 and Pu-239. The system utilizes a DD neutron generator based on inertial electrostatic confinement (IEC) to interrogate suspicious objects. To detect secondary neutrons produced during fission reactions induced in SNMs, a tensioned metastable fluid detector (TMFD) is employed. The current status of the system's development is reported in this paper, accompanied by the results from experiments conducted to detect 10 g of highly enriched uranium (HEU). Notably, the experimental findings demonstrate a distinct difference in the count rates of measurements with and without HEU. This difference in count rates surpasses two times the standard deviation, indicating a confidence level of more than 96% for identifying the presence of HEU. The paper presents and extensively discusses the proof-of-principle experimental results, along with the system's planned trajectory.

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Neutronics Analysis on the Beam Optics from Cylindrical Discharge Type Fusion Device

Cited by 4 publications

References 1 publication

The “neutron channel design”—A method for gaining the desired neutrons

The “neutron channel design”—A method for gaining the desired neutrons

Optimizing the Electrode Configuration of a Cylindrical Discharge-Type Fusion Device by Computational and Experimental Analysis

Nondestructive and active interrogation system for special nuclear material: proof of principle and initial results

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