Effects of Electrode Shape on Fusion Reaction Rate in A Cylindrical Electrostatic Confinement Device

Yamämoto, Yasushi; Kusaba, R; Shirouzu, Takayuki; Inoue, N.

doi:10.13182/fst01-a11963295

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…In addition, if, based on Reference, 26 we assume that the electron impact ionization cross‐sectional area is about 10 to 21 m 2 and the distance between the electrodes is 0.15 to 0.30 m, the ratio I i / I e of ion current to electron current is 0.03 to 0.3, and it is expected that the ion current will increase to a level comparable to the electron current in the region where the ion velocity is high. In the simulation 20 conducted by Yamamoto et al. for an IEC device with a similar electrode arrangement, an estimated NPR of 3 × 10 6 n/s was obtained under the conditions that the background gas pressure was 1 Pa, the ion current value was 10 mA, and the discharge voltage was 70 kV.…”

Section: Discussionmentioning

confidence: 99%

“…Additionally, since the electrodes can be efficiently cooled by contact heat transfer, it is easier to address the heat load that increases with the NPR. Prior studies on IEC fusion neutron sources with similar electrode arrangements include studies by Noborio 19 and Yamamoto 20 . In this paper, we focus on the anode shape of the linear IEC neutron source and report on the results of our detailed investigation into the effects of anode shape on discharge characteristics and the NPR.…”

Section: Introductionmentioning

confidence: 99%

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Anode shape dependency of discharge characteristics and neutron yield of a linear type inertial electrostatic confinement fusion neutron source

Itagaki

Hotta

Hasegawa

et al. 2020

Elect Comm in Japan

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A linear inertial electrostatic confinement fusion neutron source equipped with a cooling system for high power operation was developed and its discharge characteristics and neutron production performance were tested under a wide range of discharge conditions. Four different types of discharge anodes were prepared and the dependencies of the device performance on the anode shape were precisely investigated. A maximum neutron production rate of 3.4×106 n/s was achieved when the device was operated with single‐cylinder‐type anodes under a discharge voltage of 94 kV, a current of 20 mA, and a deuterium gas pressure of 0.5 Pa. By comparing the discharge characteristics and neutron generation rates under different anode shapes, we found that the larger inner diameter of the anode leads to longer effective gap length and lower operating pressure, which may result in relatively high fusion reaction rate observed with the single‐cylinder‐type anodes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Anode shape dependency of discharge characteristics and neutron yield of a linear type inertial electrostatic confinement fusion neutron source

Itagaki

Hotta

Hasegawa

et al. 2020

Elect Comm in Japan

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Fusion neutron source and array of particle detectors for nondestructive interrogation of special nuclear materials

Masuda,

Takahashi,

Misawa

et al. 2024

Journal of Applied Physics

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Presented herein are the outcomes of an experimental test involving a pioneering portable-active interrogation system designed for the nondestructive detection of special nuclear materials (SNMs). The system relies on the threshold energy neutron analysis concept and incorporates a portable deuterium–deuterium (DD) neutron generator producing a particle intensity of 5 × 107 n/s, coupled with three arrays of tensioned metastable fluid detectors (TMFDs) to detect secondary neutrons from the fissile material. In the presence of the fissile material, prompt fission neutrons are emitted, with an average energy of approximately 2 MeV, and around 30% of these neutrons have energies above that of the DD neutron source (2.45 MeV). The detection of a statistically significant neutron population exceeding this threshold firmly indicates the presence of SNM. TMFDs exhibit high sensitivity in efficiently detecting neutrons above the threshold while adeptly discriminating against neutrons below the threshold as well as gamma rays. This unique feature allows the interrogation system to maintain a lightweight profile without necessitating substantial shielding materials. The validation experiments involved the placement of 70 or 140 g masses of U-235 within a 1 m3 inspection volume. Measurements were carried out over 30 min intervals, repeated numerous times, both with and without U-235, at a DD neutron source intensity of 8 × 105 n/sec. Experimental count rates with natural uranium (NU) are consistently above those without NU. The probability of detection (PD) and probability of false alarm (PFA) were assessed utilizing these count rates. The DD neutron source intensity and inspection time were normalized at 5 × 107 n/sec and 90 s, respectively. The results indicated a PD of approximately 74% and 98% for detecting 70 and 140 g of U-235, respectively, with a PFA of <5%. These promising outcomes align with the specified PD (>90%) and PFA (<5%) targets outlined in ANSI standards.

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Alternative structural concepts for the Fusion Ignition Research Experiment (FIRE)

Titus

Proceedings of the 19th IEEE/IPSS Symposium on Fusion Engineering. 19th SOFE (Cat. No.02CH37231)

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Effects of Electrode Shape on Fusion Reaction Rate in A Cylindrical Electrostatic Confinement Device

Cited by 5 publications

References 5 publications

Anode shape dependency of discharge characteristics and neutron yield of a linear type inertial electrostatic confinement fusion neutron source

Anode shape dependency of discharge characteristics and neutron yield of a linear type inertial electrostatic confinement fusion neutron source

Fusion neutron source and array of particle detectors for nondestructive interrogation of special nuclear materials

Alternative structural concepts for the Fusion Ignition Research Experiment (FIRE)

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