Hybrid-PIC Simulation on Plasma Flow of Hollow Cathode

Kubota, Kei; Oshio, Yuya; Watanabe, Hiroki; Cho, Shinatora; Ohkawa, Yasushi; Funaki, Ikkoh

doi:10.2322/tastj.14.pb_189

Cited by 9 publications

(8 citation statements)

References 27 publications

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“…6 and 7, the energy fluxes of the ions and neutrals were evaluated in terms of particle description using Eqs. (15) and (16). The energy flux of ions can also be described using the following expressions,…”

Section: Energy Fluxmentioning

confidence: 96%

“…14) In this study, the hollow cathode plasma was simulated by using a hybrid particle-in-cell (PIC) model that treats the heavy species (neutrals and ions) and electrons as particles and fluid, respectively. 15) Since the hybrid-PIC model can be applied to both dense and rarefied plasma, the model is available to use for the whole domain as it is contrary to the fluid model, which requires special treatment in the plume region regarding rarefied effect. 11) Although the computational cost of hybrid-PIC is much higher than the fluid approach, recent advances in computation technology and parallel computation enable us to utilize it within a realistic time.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid-PIC Simulation of LaB<sub>6</sub> Hollow Cathode Self-Heating Characteristics

Kubota

Oshio

Watanabe

et al. 2019

Trans. Japan Soc. Aero. S Sci.

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Numerical simulation of plasma flow and the self-heating characteristics of a LaB 6 hollow cathode were performed using a hybrid-PIC model. For a discharge current of 30 A and mass flow rate of 3 mg/s, the influences of an emitter temperature profile and model parameter included in an anomalous resistivity model on the plasma flow and energy flux were investigated. In the simulation, the discharge voltage was fixed at a predetermined value and the maximum emitter temperature was periodically adjusted to keep the discharge current constant. The results show that the present model predicts the keeper floating voltage within an accuracy of 20%. It is found that the main reason for the emitter temperature to rise is due to ion bombardment and accompanying recombination energy, and that the maximum emitter temperature can be kept lower as the emitter temperature profile becomes uniform. It is also shown that thermal input into the emitter is decreased when anomalous resistivity increases.

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Section: Energy Fluxmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Hybrid-PIC Simulation of LaB<sub>6</sub> Hollow Cathode Self-Heating Characteristics

Kubota

Oshio

Watanabe

et al. 2019

Trans. Japan Soc. Aero. S Sci.

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“…The performance and characteristics of the hollow cathode with a radiative heater are described in previous research. [22][23][24][25] Trans. Japan Soc.…”

Section: Hollow Cathode With Radiative Heatermentioning

confidence: 99%

The Effect of Discharge Mode on Ion Energy and Plasma Potential in the Plume Plasma Region

Imai

Imaguchi

Watanabe

et al. 2022

Trans. Japan Soc. Aero. S Sci.

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The ion energy angle distribution and its relationship to plasma parameters for spot and plume modes are elucidated for a LaB 6 hollow cathode with a radiative heater. Measurements were conducted using a retarding potential analyzer (RPA) and a single Langmuir probe. The ion energy distribution function (IEDF) characteristics showed different tendencies in the current density and mass flow-rate dependence under different plasma modes. The IEDF peak potential for the spot mode varied from 16 to 23 V with increasing current density, and the IEDF peak potential for the plume mode varied from 16 to 32 V with decreasing mass flow rate. Considering angle dependency of ion energy, when the observation angle was changed from the radial direction to the axial direction, the IEDF peak potential increased from 29 to 40 V for the plume mode (10 A, 10 sccm) and increased slightly from 16 to 18 V for the spot mode (20 A, 30 sccm). The probe measurement analysis revealed that the IEDF peak energies are the same as, or exceed, the plasma potential and have a qualitative correlation with the electron temperature spatial distribution.

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“…The review paper of van Dijk et al [50] lists numerous techniques, variations, and applications. The hybrid PIC simulation has many applications in astrophysical plasma studies [53][54][55][56]. These studies reduce the numerical load of their calculations by describing the electrons as a fluid and solely resolving the ion dynamics kinetically.…”

Section: Hybrid Particle-in-cell/monte Carlo Collisions Simulationmentioning

confidence: 99%

A non-neutral regime of radio-frequency atmospheric pressure plasma jets: Simulation and modeling

Klich,

Wilczek,

Donko

et al. 2021

Preprint

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During the last years, atmospheric pressure plasmas have re-established themselves as a research focus. Radio-frequency driven atmospheric pressure plasma jets (here at the explicit example of the COST-Jet) are commonly used plasma sources for these studies. A characteristic feature of these atmospheric pressure plasma sources is the ratio between the Debye length λ D (here in the range of 10 ´1 to 10 ´2 mm) and the length of the discharge gap L gap (in the range of 1 mm). Compared to low-pressure applications, this ratio is rather high. Atmospheric pressure plasmas consequently do not necessarily form a quasi-neutral bulk region. This work discoveres such a non-neutral discharge regime for the COST-Jet geometry. The findings are structured in two parts. In the first part, characteristics of this non-neutral regime are unraveled in terms of hybrid particle-in-cell/Monte Carlo collisions (PIC/MCC) simulations. The simulation treats the electrons fully kinetically by invoking the PIC/MCC algorithm while sparing computational effort by treating the ions as fluids. It is found that the electrons are organized in a drift-soliton-like structure. The dynamics of this soliton-like structure determine the electron dynamics of the system. The second part formulates a simplified analytical model to describe the electron dynamics. In terms of this model, the formation of the soliton-like structure and the connection between the soliton and the electron dynamics are investigated. The discussion of the analytical model lays an emphasis on notions about the stability of the electron group. This stability analysis includes the application of the Lyapunov method and a linear stability analysis. To validate the conclusions drawn from the model, a comparison between numerical simulation and model is performed. It reveals that a non-sophisticated model can capture essential characteristics of a non-neutral discharge regime.

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Hybrid-PIC Simulation on Plasma Flow of Hollow Cathode

Cited by 9 publications

References 27 publications

Hybrid-PIC Simulation of LaB<sub>6</sub> Hollow Cathode Self-Heating Characteristics

Hybrid-PIC Simulation of LaB<sub>6</sub> Hollow Cathode Self-Heating Characteristics

The Effect of Discharge Mode on Ion Energy and Plasma Potential in the Plume Plasma Region

A non-neutral regime of radio-frequency atmospheric pressure plasma jets: Simulation and modeling

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