研究目的
To measure the xenon neutral ground state particle density in a microwave cathode using two-photon laser-induced fluorescence spectroscopy (TALIF) to understand the ionization degree and charged exchange collisions in electric propulsion systems.
研究成果
The TALIF measurement system successfully detected the neutral ground density of xenon in a microwave cathode under various conditions. The density was found to decrease with increased ionization and excitation without electron extraction and varied with anode voltage when electron extraction was applied. This system provides valuable insights into the plasma state of microwave cathodes, which is crucial for improving electric propulsion systems.
研究不足
The study is limited by the sensitivity of the laser wavelength and the need for averaging signals to reduce noise from plasma emission. The measurement is also sensitive to the laser power and the focusing structure of the fluorescence.
1：Experimental Design and Method Selection:
The study uses TALIF to measure the neutral ground state particle density of xenon in a microwave cathode. The method involves exciting xenon atoms with a laser at 224.29 nm and detecting the fluorescence at 834.7 nm.
2：29 nm and detecting the fluorescence at 7 nm.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The measurement is performed on xenon plasma in a microwave cathode under three conditions: cold gas, without electron extraction, and with electron extraction.
3：List of Experimental Equipment and Materials:
The setup includes a Nd:YAG laser, a dye laser, a vacuum chamber with cryogenic pumps, and a photomultiplier tube for detecting fluorescence.
4：Experimental Procedures and Operational Workflow:
The laser is focused on the nozzle exit of the orifice, and the emitted fluorescence is concentrated by lenses and detected by a photomultiplier tube. The signal is averaged over multiple measurements to reduce noise.
5：Data Analysis Methods:
The relationship between signal intensity and pressure is analyzed to confirm the proportionality to neutral ground density, and the results are compared under different experimental conditions.
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