Estimation of the sheath power dissipation induced by ion cyclotron resonance heating

An, Xin; Ou, Jing; Men, Zongzheng

doi:10.1088/2058-6272/ab77d2

Cited by 2 publications

(2 citation statements)

References 27 publications

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“…To investigate the IEDs in the RF sheath of fusion plasma, we consider the RF sheath driven by an ICRF wave on the EAST antenna. [ 18–19 ] The following parameters are chosen from the current typical parameters at the EAST‐like tokamak during ICRF wave heating [ 21,26 ] : the ICRF is in the range of 25–72 MHz and 1000A < I max < 2500 A because the average potential is less than 200 V if only the I‐port antenna of ICRF in EAST was active. The edge plasma density 2.0 × 10 17 m −3 < n 0 < 10 18 m −3 and ion temperature 0.1 < T i / T e < 2.…”

Section: Numerical Resultsmentioning

confidence: 99%

“…[5,17], a one-dimensional collisionless and unmagnetized sheath model coupled with an equivalent circuit model is extended to investigate the IEDs in an RF sheath of fusion plasma. [18][19] We consider deuterium the only discharge gas, and the RF sheath is driven by a current disturbance in ICRF at the wall. Figure 1 shows a schematic description of the RF sheath configuration used in this work.…”

Section: Model Descriptionmentioning

confidence: 99%

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Ion energy distribution in a radio frequency sheath of plasma with Kappa electron velocity distribution

Huang

2020

Contributions to Plasma Physics

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A hybrid model consisting of a one-dimensional radio frequency sheath model and an equivalent circuit model is used to investigate the effect of the non-Maxwellian plasma with enhanced electron tails on ion energy distribution (IED) at the plasma-wall interface. With the assumption that electrons obey the Kappa distribution in which the parameter κ characterizes the deviation from Maxwellian distribution, the bimodal shape of the IED can always be found with the decrease of κ under the condition of current experimental advanced superconducting tokamak (EAST) discharges during the ion cyclotron range of frequency wave heating. However, the height of the low-energy peak of the IED decreases, while the high-energy peak does not change significantly. In addition, the IED shifts towards the higher-energy regime, and the width of the IED expands with the decrease of κ. It is also shown that frequency and amplitude of the disturbance current, bulk plasma density, and ion temperature are the crucial parameters for determining the shape of IED even in the presence of super-thermal electrons.

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Section: Numerical Resultsmentioning

confidence: 99%

Section: Model Descriptionmentioning

confidence: 99%

Ion energy distribution in a radio frequency sheath of plasma with Kappa electron velocity distribution

Huang

2020

Contributions to Plasma Physics

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Formation of the radio frequency sheath of plasma with Cairns–Tsallis electron velocity distribution

Men

2020

Physics of Plasmas

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The effect of the non-Maxwellian plasma with enhanced electron tails on the properties of the radio frequency (RF) sheath is studied with a one-dimensional collisionless model, which consists of the sheath model and the equivalent circuit model. In the sheath model, electrons are assumed to obey the Cairns–Tsallis distribution. For various entropic indices q characterizing the degree of electron nonextensivity and parameter α measuring the electron nonthermality state, the electron nonextensivity and nonthermality are found to modify the potential drop across the sheath and the sheath thickness, as well as the spatiotemporal variations of the potential, the ion and electron densities inside the sheath. With the decrease in q and the increase in α, the potential drop across the sheath and the thickness increase at any time in a RF cycle as a result of the increase in superthermal electrons in the non-Maxwellian tail. The dependence of the potential drop across the sheath on q and α is deeply related to the frequency and amplitude of the disturbance current. When the electron nonextensivity and nonthermality are strengthened, the enhancement of the sheath potential drop can cause a significant increase in the ion bombardment energy on the wall, sheath power dissipation, and plasma energy flux to the wall.

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Estimation of the sheath power dissipation induced by ion cyclotron resonance heating

Cited by 2 publications

References 27 publications

Ion energy distribution in a radio frequency sheath of plasma with Kappa electron velocity distribution

Ion energy distribution in a radio frequency sheath of plasma with Kappa electron velocity distribution

Formation of the radio frequency sheath of plasma with Cairns–Tsallis electron velocity distribution

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