Energetic Ion Effects on the Ion Saturation Current

Lin, Binbin; Xiang, Nong; Ou, Jing; Zhao, Xia

doi:10.1088/0256-307x/34/1/015203

Cited by 4 publications

(7 citation statements)

References 20 publications

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“…When the energetic ion component is present, an estimate of the energetic ions affecting significantly on the sheath indicates that their concentration α i is greater than T e,1 /(γT i,2 ). [13] Under the same parameters, due to the smaller mass and the resulting 025204-3 larger energetic ion flux, the potential drop across the sheath in the case of the hydrogen ion as an energetic ion component is smaller than in the case of the deuterium ion as the energetic ion component. When the energetic electron component is present in the sheath as shown in Fig.…”

Section: Sheath Resultsmentioning

confidence: 99%

“…For the multi-ion-component plasma collisionless sheath, it is suggested from both analytical and numerical results that each ion species should satisfy its own Bohm criterion at the sheath edge. [13,29,30] When there are more than the population of negatively charged particles in the plasma sheath, by following Riemann, [31] the Bohm criterion can be written as…”

Section: Sheath Of Plasma Containing Energetic Particles 21 Sheath Modelmentioning

confidence: 99%

“…[7] As is well known, the presence of energetic particles can change the sheath structure. [8][9][10][11][12][13] A natural question is whether energetic particles can influence dust particles in the sheath. Combining with other diagnostic tools such as laser scattering and fast cameras, the investigation of the dust particles inside the sheath is a way to study the lifetime of the wall material because a lot of dust particles imply the strong plasma-wall interaction.…”

Section: Introductionmentioning

confidence: 99%

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Dust charging and levitating in a sheath of plasma containing energetic particles

Zhao

Lin

2018

Chinese Phys. B

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The structure of the sheath in the presence of energetic particles is investigated in the multi-fluid framework. Based on the orbital motion limited (OML) theory, the dust grain charging inside the sheath of plasma containing energetic particles is examined for the carbon wall, and then the effect of the energetic particles on the stationary dust particle inside the sheath is discussed through the trapping potential energy. It is found that with the increase of energetic ion concentration or energy, the size of dust staying in levitation equilibrium decreases and the levitating position is much closer to the wall. In the case of deuterium ions as energetic ions, the bigger dust particle can be trapped by the sheath than in the case of hydrogen ions as energetic ions. When the energetic electron component is present, the levitating position of dust particle in the sheath depends strongly on the energetic electron. The levitating dust particle is closer to the wall as the energetic electron energy or concentration is increased. In addition, with the increase of temperature of thermal background ion, the size of dust particle trapped by the sheath decreases and the levitating positions of dust particles with the same size radius inside the sheath move toward the wall. Our results can be helpful in investigating the property of the sheath where the energetic particle component is present.

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Section: Sheath Resultsmentioning

confidence: 99%

Section: Sheath Of Plasma Containing Energetic Particles 21 Sheath Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dust charging and levitating in a sheath of plasma containing energetic particles

Zhao

Lin

2018

Chinese Phys. B

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“…where v i0, j is the ion velocity at the sheath edge. For the multi-ion-component plasma collisionless sheath, it is suggested from both analytical and numerical results that each ion species at the sheath edge should satisfy its own Bohm criterion, [19,20] i.e., v i0, j = C s, j . For a sheath of more than one population of negatively charged particles, by following Riemann, [21] the Bohm velocity can be written as C s, j = (T i, j + Z i, j T e,eff )/m i with the ions charge states Z i, j and the effective electron temperature T e,eff defined as…”

Section: Model Descriptionmentioning

confidence: 99%

Estimation of tungsten production from the upper divertor in EAST during edge localized modes*

Xiang

Men

et al. 2019

Chinese Phys. B

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During edge localized modes (ELMs), the sheath evolution in front of the Experimental Advanced Superconducting Tokamak (EAST) upper divertor is studied to estimate the sputtered tungsten (W) atoms from the divertor target. A large potential drop across the sheath is formed during ELMs by compared with inter-ELMs, and the maximum of sheath potential drop can exceed one thousand of eV in current EAST operation. Due to the enhancement of the sheath potential drop during ELMs, the W physical sputtering yield from the deuterium (D) ions and the impurity ions on the upper divertor target is found to be significant. It is established that the sputtered W yield during ELMs is at least higher by an order of magnitude than inter-ELMs, and D ions and carbon (C) ions are the main ions governing the W production for the current H-mode with ELMs discharges. With increase in the pedestal electron temperature, the maximum of the D and C ion impact energy during ELMs shows a nearly linear increase, and the D ions have sufficient impact energy to cause the strong W physical sputtering. As a consequence, the D ions may dominate the sputtered W flux from the divertor target when the C concentration is controlled less than one percent for the higher heating power H-mode with ELM discharges in near future.

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“…The present work should be helpful for understanding the formation of dust clusters in plasmas, especially near the wall region. [7][8][9][10][11]40]…”

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confidence: 99%

Self-Organization of Charged Particulates in the Presence of External Force

Wang

Chen

2017

Chinese Phys. Lett.

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Evolution of spatial distribution of charged particulates under the action of an external force is investigated. It is found that starting from a homogeneous Maxwellian distribution of particulates, clusters can form and aggregate. The evolution process, as well as the asymptotic number and configuration of the clusters formed, depends strongly on the strength of the external force. The particulates in most of the final clusters are in the crystal state, as can also be deduced from the corresponding velocity and auto-correlation functions.

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Energetic Ion Effects on the Ion Saturation Current

Cited by 4 publications

References 20 publications

Dust charging and levitating in a sheath of plasma containing energetic particles

Dust charging and levitating in a sheath of plasma containing energetic particles

Estimation of tungsten production from the upper divertor in EAST during edge localized modes*

Self-Organization of Charged Particulates in the Presence of External Force

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