A 3D particle model for the plume CEX simulation

Lu, Chang; Qiu, Penghua; Cao, Yong; Zhang, T.P.; Chen, J.J.

doi:10.1017/aer.2018.79

Cited by 6 publications

(3 citation statements)

References 20 publications

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“…Additionally, the thermal deformation of the grids in the area is intensified because of the high current density, and it increases the risk of the short circuit. On the other hand, the charge exchange (CEX) ions [4][5][6] that are generated by collision between ions and neutral atoms will sputter away materials from the downstream surface of the accelerator grid. Aperture barrel is enlarged because of the sputtering erosion and there is a hexagonal 'pits-and-grooves' pattern on the downstream of accel grid surface, which results in the structural failure of the grids if the erosion penetrates through the grid.…”

Section: Introductionmentioning

confidence: 99%

Investigation of variable aperture on the performance and lifetime of ion thruster

Chen

Jia

Geng

et al. 2021

Plasma Sci. Technol.

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Beam flatness is an important parameter that determines the performance and the lifetime of a gridded ion thruster. To improve the beam flatness of the 30 cm (LIPS-300) ion thruster, variable aperture ion optics that adapts to the decreasing ion density as the radius increases is proposed. It is the ion optics that the screen grid surface is divided into several zones, where the aperture diameter in each zone is determined by the ion density and the electron temperature upstream of the screen grid. The beam current density in the central area is artificially reduced. A particle in cell-Monte Carlo collision model is applied in this work to investigating the effect of variable aperture on the perveance and the maximum beam current per aperture by simulating the extraction, focusing and acceleration processes of ions. Taking into account the engineering implementability, the screen grid surface is divided into four zones. The hole diameter in each zone is decreased from 1.95 mm to 1.8 mm, 1.9 mm, 1.8 mm and 1.7 mm, respectively. The simulation results show that the maximum ion density in the center area of grid is decreased by 10.6% and 6.99%, while it is increased by 6.49% and 22.3% in the edge region, respectively. The beam flatness of the variable aperture ion optics is improved from 0.69 to 0.88. The erosion rate is decreased by 31.9%, but the total beam current is also decreased by 7.15%. The simulation results can provide a valuable reference of the development of the ion thruster.

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Section: Introductionmentioning

confidence: 99%

Investigation of variable aperture on the performance and lifetime of ion thruster

Chen

Jia

Geng

et al. 2021

Plasma Sci. Technol.

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“…Therefore, the grid erosion characteristics of FEEP are studied in this paper. The mechanism of grid erosion is analyzed by the three-dimensional immersed finite element particle-in-cell Monte Carlo collision (IFE-PIC-MCC) model [14][15][16][17]. In section 2, the simulation model and parameter settings based on the IFE-PIC-MCC method are given.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of the grid erosion of field emission electric propulsion

Lu¹,

Xia²,

Gao³

et al. 2021

Plasma Sci. Technol.

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In this paper, the immersed finite element particle-in-cell Monte Carlo collision (IFE-PIC-MCC) model is used to study the cause of the grid erosion in field emission electric propulsion (FEEP). The simulation results show that charge exchange (CEX) ions are the main cause of the grid erosion, while beam ions basically do not impinge on the grid. The CEX ions are mainly generated near the grid. Some of these CEX ions return to the upper surface, lower surface and notch side surface of the grid. The impact angle of CEX ions returning to the upper and side surfaces is large, but their energy is low, while the impact angle of CEX ions returning to the lower surface is small, but their energy is high. The above characteristics lead to the similar erosion rates of these three surfaces.

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“…Due to the above advantages, the IFE methods have been developed together with particle‐in‐cell (PIC) method for different interface problems and plasma simulation problems . The IFE‐PIC method has also been extended to handle unbounded interface problems with asymptotic boundary condition and periodic boundary condition .…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional immersed finite‐element method for anisotropic magnetostatic/electrostatic interface problems with nonhomogeneous flux jump

Yang

Bai

et al. 2020

Numerical Meth Engineering

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Summary Anisotropic diffusion is important to many different types of common materials and media. Based on structured Cartesian meshes, we develop a three‐dimensional (3D) nonhomogeneous immersed finite‐element (IFE) method for the interface problem of anisotropic diffusion, which is characterized by an anisotropic elliptic equation with discontinuous tensor coefficient and nonhomogeneous flux jump. We first construct the 3D linear IFE space for the anisotropic nonhomogeneous jump conditions. Then we present the IFE Galerkin method for the anisotropic elliptic equation. Since this method can efficiently solve interface problems on structured Cartesian meshes, it provides a promising tool to solve the physical models with complex geometries of different materials, hence can serve as an efficient field solver in a simulation on Cartesian meshes for related problems, such as the particle‐in‐cell simulation. Numerical examples are provided to demonstrate the features of the proposed method.

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A 3D particle model for the plume CEX simulation

Cited by 6 publications

References 20 publications

Investigation of variable aperture on the performance and lifetime of ion thruster

Investigation of variable aperture on the performance and lifetime of ion thruster

Numerical study of the grid erosion of field emission electric propulsion

Three‐dimensional immersed finite‐element method for anisotropic magnetostatic/electrostatic interface problems with nonhomogeneous flux jump

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