Effects of non-Maxwellian electron distributions on charge-state populations in laser-produced plasmas

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860757· OSTI ID:6364614

Lee, Y T ^[1]; Lamoureux, M ^[2]

---

1. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
2. Laboratoire de Spectroscopie Atomique et Ionique, Bat 350, Universite Paris-Sud, 91405, Orsay (France)

The effects of a non-Maxwellian electron distribution on the charge-state populations in a plasma with the distribution characterized by the function [ital f]([ital v])=[ital F][sub [ital m]] exp[[minus]([ital v]/[ital v][sub [ital m]])[sup [ital m]]] with 2[le][ital m][le]5 are investigated. In the underdense region of a laser produced plasma, the parameter [ital m] would depend on the electron temperature, electron density, and the average ionization state of the plasma in addition to the optical laser intensity and wavelength. The ion populations are obtained by solving the rate equations in which the coefficients are evaluated by integrating the cross sections over the non-Maxwellian electron distributions. The scaling of [ital m] with column density and optical laser intensity in laser exploding foils is obtained. The effects of a non-Maxwellian electron distribution on the charge-state populations in both selenium and molybdenum foils, similar to those used to model recent x-ray laser experiments, are calculated. The effects on the dominant populations are found to be small, less than a dozen of percents.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6364614
• Journal Information: Physics of Fluids B; (United States), Vol. 5:7; ISSN 0899-8221
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
LASER-PRODUCED PLASMA
CHARGE STATES
DISTRIBUTION FUNCTIONS
BREMSSTRAHLUNG
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELECTRON-ELECTRON COLLISIONS
LASER RADIATION
MOLYBDENUM
SELENIUM
COLLISIONS
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELEMENTS
FUNCTIONS
METALS
PLASMA
RADIATIONS
SEMIMETALS
TRANSITION ELEMENTS
700350* - Plasma Production
Heating
Current Drive
& Interactions- (1992-)
700330 - Plasma Kinetics
Transport
& Impurities- (1992-)
700380 - Elementary & Classical Processes in Plasmas- (1992-)