![Main parameters of plasma
1. Density Ne – number of electrons in volume, 1/cm3.
2. Temperature T, [eV]. 1 eV = 11606 K ~ 104K.
mv 2
3
e U
kT
2
2
eU[J]
eU[eV] kT[J]
T[eV]
3. Langmuir frequency- plasma frequency:
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Plasma science and applications 2013
- 1. Plasma Physics: Fundamentals and Applications Dr. Sergey Korenev 1
- 2. Content • • • • • • Introduction to Plasma Physics. Fundamental aspects of Plasma Physics. Methods and equipment for plasma forming. Applications of atmospheric plasma. Applications of vacuum plasma. Conclusion. 2
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- 4. Examples 4
- 5. Fundamental questions 1. Nature of plasma. 2. Fundamental properties. 3. Types of plasma. 5
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- 7. Plasma Components Plasma is 4th state of matter and consists from mix of ions, electrons, atoms, molecules. 7
- 8. Types of Plasma 1. Ionized gas. More understanding. 2. Ionized solid state (Example: ionized semiconductors ( Fast ionized dinistors)). 3. Ionized liquid (Example: breakdown of water or oil). 4. Dust plasma. 5. Cluster plasma (Example: evaporated plasma in electron source). 8
- 9. Main parameters of plasma 1. Density Ne – number of electrons in volume, 1/cm3. 2. Temperature T, [eV]. 1 eV = 11606 K ~ 104K. mv 2 3 e U kT 2 2 eU[J] eU[eV] kT[J] T[eV] 3. Langmuir frequency- plasma frequency: 9
- 10. Main directions 1. Methods and devices for forming of plasma. 2. Applications of plasma in science, technology and industry. 10
- 11. Methods and devices for forming of plasma It is very complicated area: 1. Fundamental knowledge and understanding of plasma physics. 2. Knowledge and experience in electrical engineering. 11
- 12. Main tasks 1. Forming of volume plasma. 2. Forming of large cross section plasma 12
- 13. Passive and active generation of plasma 1. Passive generation of plasma: Thermal ionization and chemical processes. 2. Active generation of plasma: Ionization of atoms & molecules by external active energy source. 13
- 14. General structure of active plasma source 14
- 15. Gas plasma Electrical field Electrons Ionization Excitation Dissociation GAS PLASMA External particles, protons, muons, ions, X-rays, UV, Laser 15
- 16. Atmosphere plasma Atmosphere plasma – generation of plasma for pressure 760 Torr. Hard conditions: variation of temperature, humanity. The types of plasma: 1. Pulsed plasma. 2. DC 3. AC, RF MW plasma 16
- 17. Atmosphere plasma 1. Corona discharge. 2. Barrier Dielectric Discharge 3. Arc. 4. Pulsed discharge. 5. Gliding discharge. 17
- 18. Types of pulsed plasma generators SWITCHES HIGH VOLTAGE POWER SUPPLY CHARGE POWER SUPPLY R SWITCH PLASMA L C C HVD Rcur PIN ELECTRODE PLATE ELECTRODE CURRENT TRANSFORMER SWITCH DIELECTRIC METAL PLATE CHARGE POWER SUPPLY C L METAL GRID METAL ELECTRODE 18 SCOPE
- 20. Pulsed High Voltage Generators 1. Nanosecond generator with high repetition. 2. Picosecond generators with high repetition.. 20
- 21. Pulsed High Voltage Generators 1. Induction energy storage. 2. Capacitor energy storage. 3. Combined capacitor-induction energy storages. 21
- 22. Pulsed High Voltage Generators 1. Novel switches based on open semiconductors. 2. Hydrogen Thyrotrons. 22
- 23. High Pressure gas plasma Main reason of increasing pressure is increasing of electrical insulation. Gas sparks for high voltage and pulsed power equipment. Different gases: N2, SF6, N2+CO. 23
- 24. Ionization of gas by charged particles Ionization gas by charged particles is effective method for generation of volume plasma. 24
- 25. Vacuum plasma 1. Forming of plasma for glow discharge . 2. Forming of clusters high energy plasma for technical vacuum. 3. Forming of magnetron discharge. 25
- 26. Applications of plasma in Industry Applications of atmospheric and vacuum plasma 26
- 27. Atmospheric plasma Positive Problem Pressurized plasma State between liquid and gas Materials science & technology High voltage engineering Large cross section Plasma chemistry Environmental applications Pulsed power technologies Instrumentation & diagnostics 27
- 28. Vacuum plasma Positive High purity matter Materials science & technology Problem Large cross section Vacuum plasma Clusters and fractal technologies Generation of beams Microwave and pulsed power technologies Instrumentation & diagnostics New state of matter 28
- 29. Conclusion The plasma physics is interesting and opened field of Physics for new discoveries. . 29
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