|Author||Macheret, Sergey O. ♦ Tholeti, Siva Sashank ♦ Alexeenko, Alina A.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ ANODES ♦ ARGON ♦ ATOMS ♦ CATHODES ♦ COLLISIONS ♦ CURRENT DENSITY ♦ ELECTRIC POTENTIAL ♦ FIELD EMISSION ♦ IONIZATION ♦ IONS ♦ MOLECULES ♦ MONTE CARLO METHOD ♦ NANOTUBES ♦ PLASMA DENSITY ♦ SIMULATION ♦ SPACE CHARGE|
|Abstract||A principle of microplasma generation that utilizes field emission of electrons at the cathode and field ionization producing ions at the anode, both processes relying on nanorods or nanotubes, is explored theoretically. In this plasma generation concept, collisional ionization of atoms and molecules by electron impact would play a negligible role. Analytical estimates as well as plasma kinetic modeling by particle-in-cell method with Monte Carlo collisions in argon confirm that this principle can enable substantial plasma densities at near-collisionless microgaps, while requiring relatively low voltages, less than 100 V. An order of magnitude increase in electron number density can be achieved due to enhancement of field emission at the cathode by positive space charge at high field ionization ion current densities.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Applied Physics Letters|
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