期刊
APPLIED PHYSICS LETTERS
卷 100, 期 22, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4724205
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- Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Building Technology of the U.S. Department of Energy (DOE) [DE-AC02-05CH11231]
The plasma over the racetrack in high power impulse magnetron sputtering develops in traveling ionization zones. Power densities can locally reach 10(9) W/m(2), which is much higher than usually reported. Ionization zones move because ions are evacuated by the electric field, exposing neutrals to magnetically confined, drifting electrons. Drifting secondary electrons amplify ionization of the same ionization zone where the primary ions came from, while sputtered and outgassing atoms are supplied to the following zone(s). Strong density gradients parallel to the target disrupt electron confinement: a negative feedback mechanism that stabilizes ionization runaway. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4724205]
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