Radiation losses from non-stationary plasmas due to oxygen impurities

Autor:	W. Engelhardt, W. Köppendörfer, D.F. Düchs
Rok vydání:	1974
Předmět:	Nuclear and High Energy Physics Electron density Materials science Physics::Plasma Physics Impurity Ionization Electron temperature Electron Plasma Atomic physics Radiation Condensed Matter Physics Ion
Zdroj:	Nuclear Fusion. 14:73-78
ISSN:	1741-4326 0029-5515
DOI:	10.1088/0029-5515/14/1/011
Popis:	Observations of theta-pinch plasmas were followed up by calculating the energy losses due to resonance line radiation from oxygen impurities. A plasma, homogeneous in density and temperature, was assumed to be heated instantly from a low initial temperature to a certain high temperature. The oxygen atoms are thereby ionized over different ionization stages until equilibrium conditions are reached. On the assumption of prevailing binary collisions a normalized density-independent time and a normalized density-independent emission coefficient can be introduced. Three-body collisions and stepwise excitation in lithium-like ions limit this scaling to electron densities below 1016 cm−3. With the help of these results an estimate of the energy losses by line radiation due to oxygen impurities in non-stationary plasmas like pinches, tokamaks and stellarators is possible provided the impurity concentration and the electron density and temperature are known from measurements.
Databáze:	OpenAIRE
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