Effects of Metal Hydride Coatings at the Electrodes on Neutron Production Rate in a Discharge-Type Fusion Neutron Source

Sakabe, T.; Kenjo, Shunsuke; Ogino, Yuka; Mukai, Keisuke; Bakr, Mahmoud; Yagi, Juro; Konishi, Satoshi

doi:10.1109/tps.2022.3182723

Cited by 5 publications

(1 citation statement)

References 19 publications

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“…We used 2.45-MeV monochromatic neutrons to simulate low-energy nuclear recoil by WIMPs. The neutron source was a glow discharge fusion neutron source [14] developed at the Institute of Advanced Energy, Kyoto University. By applying high voltage to the electrode coated with…”

Section: Experiments 21 Setup Of This Experimentsmentioning

confidence: 99%

Quenching factor measurement of low-energy Na recoils in ultra-pure NaI(Tl) crystal

Urano,

Fushimi,

Hata

et al. 2024

Proceedings of XVIII International Conference on Topics in Astroparticle and Underground Physics — PoS(TAUP2023)

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Section: Experiments 21 Setup Of This Experimentsmentioning

confidence: 99%

Quenching factor measurement of low-energy Na recoils in ultra-pure NaI(Tl) crystal

Urano,

Fushimi,

Hata

et al. 2024

Proceedings of XVIII International Conference on Topics in Astroparticle and Underground Physics — PoS(TAUP2023)

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Influence of electrodes' geometrical properties on the neutron production rate of a discharge fusion neutron source

et al. 2023

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Trapping ions, such as deuterium and tritium, inside a potential well to generate neutrons is a well-established technology through electric and magnetic fields via the inertial electrostatic confinement fusion (IECF) and the tokamak, respectively. In the IECF, the straightforward configuration is a concentric cathode connected to a negative bias, surrounded by a grounded anode that serves as a vacuum vessel. Theoretically, neutrons are generated inside the vessel through fusion between ions that are accelerated by applying several tens kV voltage and tens mA current. Many parameters affect the plasma conditions and fusion in the system, hence the neutron production rate (NPR). This study investigates the cathode transparency and the number of apertures effect on NPR. For this end, eleven cathodes were fabricated from stainless steel in three different groups with different transparency and number of apertures. NPRs were investigated as a function of the cathode transparency and number of apertures at low power operating mode ∼1 kW. Experimental results revealed that higher NPR was produced from lower grid transparency and vice versa; this behavior was explained through beam–surface fusion with grid surface. In addition, a higher NPR was generated from the grid with many apertures; this was attributed to the effect of the deuterium ionization improvement by the number of ionizing electrons through the grid channels.

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Cathode cooling effects on the neutron production rate in the glow discharge type of fusion neutron source

Sakabe,

Ishii,

Mukai

et al. 2024

Journal of Applied Physics

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Fusion reactions on the cathode surface of glow discharge deuterium–deuterium fusion neutron sources contribute significantly to the neutron production rate (NPR). While the NPR shows a linear relationship with current in the low current regime, a rise in cathode temperature in the high-current regime causes stagnation of the NPR. This tendency may be caused by high-temperature-induced desorption of deuterium on the cathode. This study aims to clarify the relationship between NPR and deuterium desorption. The present study utilized a water-cooling system to prevent deuterium desorption on the cathode. A stainless-steel 304 cathode and a diamond-like carbon (DLC)-coated cathode were tested. The cooling system kept the cathode temperature below 315 K throughout the experiment. In the case of the DLC-coated cathode, the water-cooling system improves the NPR in a high-current regime (30 mA or more in the present study). At 50 kV and 60 mA, the NPRs were 1.87 × 106 and 8.39 × 105 (n/s), with and without water cooling, respectively. Furthermore, without the cooling system, the NPR correlation with the cathode temperature indicates good agreement with the estimation model of deuterium desorption on the DLC-coated cathode. This study demonstrates that suppression of deuterium desorption in the cathode improves NPR, especially in the high-current regime.

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Effects of Metal Hydride Coatings at the Electrodes on Neutron Production Rate in a Discharge-Type Fusion Neutron Source

Cited by 5 publications

References 19 publications

Quenching factor measurement of low-energy Na recoils in ultra-pure NaI(Tl) crystal

Quenching factor measurement of low-energy Na recoils in ultra-pure NaI(Tl) crystal

Influence of electrodes' geometrical properties on the neutron production rate of a discharge fusion neutron source

Cathode cooling effects on the neutron production rate in the glow discharge type of fusion neutron source

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