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Transition from the C3-dominated discharge to the sooting plasma
1Accelerator Laboratory, PINSTECH, P. O. Nilore, Islamabad, Pakistan. shoaib@pinstech.org.pk
Summary
Researchers studied the transition to sooting plasma in graphite hollow cathode discharges. Key factors include magnetic field shape, source geometry, current, and pressure, with specific emission bands indicating sooting.
Area of Science:
- Plasma Physics
- Spectroscopy
- Materials Science
Background:
- Graphite hollow cathode discharges are utilized in various applications.
- Understanding plasma transitions is crucial for controlling discharge properties.
- Soot formation can impact plasma behavior and source performance.
Purpose of the Study:
- To identify the key parameters governing the transition from a C3-dominated discharge to a sooting plasma.
- To characterize the emission signatures associated with the sooting plasma state.
Main Methods:
- Utilized mass spectrometry to analyze plasma composition.
- Employed photoemission spectroscopy to study electronic properties.
- Investigated the influence of magnetic field configuration (B(z)(r, theta)), source geometry, discharge current, and pressure.
Main Results:
- The transition is dependent on magnetic field shape, source geometry, discharge current, and pressure.
- Atomic and molecular emission lines in the C3 discharge evolve into broad bands from excited soot.
- Four distinct emission bands between 300-400 nm were identified as characteristic of the sooting plasma.
Conclusions:
- The study elucidates the critical parameters controlling sooting plasma formation in graphite hollow cathodes.
- Specific UV-Vis emission bands serve as reliable indicators for the presence of sooting plasma.