Investigation of SOL plasma interaction with graphite PFC

Lim, Seong Taek; Kim, Hyun-Su; Jin, Younggil; Lee, Jin Young; Song, Ju Sun; Kim, Gon−Ho

doi:10.1016/j.jnucmat.2014.10.087

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…In biological and agricultural applications, the interactions between plasmas and surfaces of liquid targets are very important issues. It is well-known phenomena that impurities from the treatment target change the characteristics of low-pressure plasmas like electron density and electron temperature 7 . Furthermore, the effects on plasma characteristics are more severe in the case of a liquid target rather than a solid target because of density change of electrolyte ions in the liquid target, easy evaporation from the liquid target surface and the surface deformation of the liquid target.…”

Section: Introductionmentioning

confidence: 99%

Mutual Interaction between Plasma Characteristics and Liquid Properties in AC-driven Pin-to-Liquid Discharge

Yoon¹,

Jeon²,

Yi³

et al. 2018

Sci Rep

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This study investigated the mutual interaction between the plasma and plasma treated water (PTW). Many works have shown that the plasma treatment decreases the pH of PTW due to nitric oxide electrolyte ion but the interactions between PTW and the plasma are still largely unknown. We investigated the effect of PTW on a plasma as well as the effect of a plasma on PTW using a pin-to-liquid discharge system. It is found that PTW affects not only the chemical properties but also the physical properties of the plasma such as breakdown voltage and concentration of plasma column. The decrease of the liquid surface tension of PTW due to nitric oxide electrolyte ion from the plasma results in the increase of plasma current onto the surface of PTW and vice versa. The feedback process will be continued until the transition from normal discharge to abnormal discharge. These results can be basic data for the development of plasma sources to treat liquids.

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Section: Introductionmentioning

confidence: 99%

Mutual Interaction between Plasma Characteristics and Liquid Properties in AC-driven Pin-to-Liquid Discharge

Yoon¹,

Jeon²,

Yi³

et al. 2018

Sci Rep

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Bullet-to-streamer transition on the liquid surface of a plasma jet in atmospheric pressure

Yoon¹,

Kim

et al. 2017

Physics of Plasmas

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This study investigated the transition of the plasma shape from a ring-shaped bullet to a pin-like streamer adjacent to the electrolyte surface in a kHz-driven helium atmospheric pressure plasma jet. The transition was observed by synchronized fast images, plasma propagation speed, time-resolved emission profile of Hβ, and spatially and temporally resolved helium metastable density. The transition height increased when electrolyte evaporation was enhanced. The plasma continued to discharge on the electrolyte surface even in the absence of metastable species, i.e., the discharge mechanism changed from Penning ionization between helium metastable and ambient nitrogen to electron collision on evaporated water.

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Investigation of collision effects on ion dynamics in the presheath and sheath of weakly collisional and magnetized hydrogen plasmas

Lee,

Kim,

Song

et al. 2024

Physics of Plasmas

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The effect of collisions on the motion of magnetized ions in sheath and presheath plasma regions was investigated through the measurement of ion incident angle of a hydrogen ion at a graphite surface. The experiment was conducted in hydrogen and deuterium plasmas where the ion mean free path is 5–10 times larger than the ion gyro radius and with varying magnetic field angle ψ from 0° to 90° normal to the target surface. The hydrogen ions actively reacted with carbon, leading to the formation of conical tips with axes directed along the incident ion flow direction. The ion incident angle was measured from the etched graphite images taken by scanning electron microscopy. The measured angles were compared to those calculated using Ahedo's fluid magnetic sheath model. In addition, we adopted the nominal Bohm criterion at the electrostatic sheath edge due to the larger ion gyro radius than the sheath. The results show that the ion incident angle was inclined to the normal direction with respect to the magnetic field angle because of the effect of ion collisions on ion motion in the presheath. The collisional effect on the ion motion is drastic for an oblique magnetic field angle ψ > 85°. This study demonstrates that the collisional property of the ions is crucial to guide the ion motion in magnetic (pre)sheath and to determine the ion incidence angle at the surface, even in collisionless and weakly magnetized plasmas.

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Investigation of SOL plasma interaction with graphite PFC

Cited by 4 publications

References 18 publications

Mutual Interaction between Plasma Characteristics and Liquid Properties in AC-driven Pin-to-Liquid Discharge

Mutual Interaction between Plasma Characteristics and Liquid Properties in AC-driven Pin-to-Liquid Discharge

Bullet-to-streamer transition on the liquid surface of a plasma jet in atmospheric pressure

Investigation of collision effects on ion dynamics in the presheath and sheath of weakly collisional and magnetized hydrogen plasmas

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