研究目的
Investigating the plasma characteristics in a laser ablation pulsed plasma thruster to improve its propulsion performance for space micro propulsion.
研究成果
The study concludes that the LA-PPT can significantly improve propulsion performance, with specific impulse and thrust efficiency reaching 6808 s and 70.6%, respectively. The ionization of particles depends on the discharge intensity, and higher discharge energy increases the ionization degree without significantly affecting the collision between particles and electrodes.
研究不足
The study focuses on the plasma characteristics within the thruster and does not extensively explore the external effects or long-term performance of the thruster in space conditions.
1：Experimental Design and Method Selection:
The study uses optical emission spectroscopy (OES) to investigate plasma characteristics in a laser ablation pulsed plasma thruster (LA-PPT). The LA-PPT separates laser ablation and electromagnetic acceleration to improve propulsion performance.
2：Sample Selection and Data Sources:
Metal aluminum is used as the solid propellant. Spectral lines at different times, positions, and discharge intensities are recorded.
3：List of Experimental Equipment and Materials:
The LA-PPT consists of a solid propellant, a ceramic tube, an insulator, and a pair of rectangular electrodes. The OES experimental set-up includes an optical fiber, spectrometer, ICCD camera, controller, functional signal generator, and Nd:YAG laser.
4：Experimental Procedures and Operational Workflow:
The time sequences of the OES measurement system are set to ensure stable laser output and effective spectrometer working. Spectral lines are recorded at different delay times and positions.
5：Data Analysis Methods:
The emission intensity of spectral lines is analyzed to understand the plasma characteristics, including ionization degree and velocity of plasmas.
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