Abstract
Drag-free control is the key technology for space gravitational wave detection, which will be completed by miniature thruster. 2 cm Electron Cyclotron Resonance Ion Thruster (ECRIT) may be used for the drag-free control. Therefore, the 3D PIC method is used to estimate the thrust regulation of 2 cm ECRIT through simulating the property of ion extracting from the double-grid system. Through analyzing the thrust performance and grid focusing property under different grid apertures, the better grid structure is selected for the subsequent calculation. On this basis, the influence of grid voltage and the ion density on the performance of the thruster is analyzed. The result shows that reducing grid aperture can reduce the thrust, but it also affects the focusing property of the grid. Changing the ion density can adjust the thrust in a wide range. At given grid structure and ion density, there is a suitable grid accelerating voltage range to ensure the best ion focus characteristics. Considering the thrust performance and focusing characteristics, the grid structure with screen and accelerating grid aperture in 0.6 mm and 0.34 mm is selected. When the ion density is 1×1 017, 0.7×1 017, 0.4×1 017 and 0.2×1 017 m-3, the thrust can range from 5.05 to 141.44 μN through adjusting the grid accelerating voltage. This study can provide information for analyzing the possibility of the thruster application.
Highlights
Calculation on 2 cm ECRIT Thrust Regulation Based on 3D PIC Numerical Simulation Method
Drag⁃free control is the key technology for space gravitational wave detection, which will be completed by miniature thruster. 2 cm Electron Cyclotron Resonance Ion Thruster ( ECRIT) may be used for the drag⁃free con⁃ trol
The 3D PIC method is used to estimate the thrust regulation of 2 cm ECRIT through simulating the property of ion extracting from the double⁃grid system
Summary
取栅极加速电压分别为 1 850 和 850 V,对屏栅 孔径 0.6 mm,加速栅孔径 0.34 mm 的栅极结构进行 不同栅前离子密度条件下的仿真计算,计算结果如 图 6 所示。 胡展,等:基于三维 PIC 数值模拟的 2 cm ECRIT 推力控制计算 根据计算 结 果, 可 以 看 出, 当栅前离子密度为 0.2×1017 ~ 1 × 1017 m-3 时,基本可以满足 5 ~ 100 μN 的推力范围,且当栅前离子密度分别为 1×1017, 0.7×1017,0.4×1017,0.2×1017 m-3时,可实现推力的连 续调节。 因此,选择上述 4 种栅前离子密度,分别进 行不同栅极加速电压下仿真计算。 在计算中,栅极 加速电压分别取 600,850,1 200,1 450 和 1 850 V。 计算结果如图 7 所示,可以看出,随着栅极加速电压 的增加,推力上升趋势明显,这是由于增加栅极加速 电压不仅能增加离子通过率,还能提高引出的离子 速度,从而增大推力。 比较图 7 中加速栅电流比 γ 计算结果可以看出,当栅前离子密度较高时,过低的 栅极加速电压会使离子引出达到束流导流极限,导 致 γ 增加如图 7a)所示;当栅前离子密度较低时,过 高的栅极加速电压会使离子引出达到束流交叉极 限,导致 γ 急剧增加如图 7d) 所示。 在这 2 种情况 下,栅极聚焦性能均不理想。 Performance of the Miniature and Low Power Microwave Discharge Ion Engine μ1[ C] ∥46th AIAA / ASME / SAE / ASEE Joint Propulsion Conference & Exhibit, 2010
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