K-Shell Line Radiation from Laser-Produced Aluminum Plasmas.
NAVAL RESEARCH LAB WASHINGTON D C
Pagination or Media Count:
Two rate equation models are developed to describe the emission of K-line radiation from laser-produced aluminum plasmas. In the first model, the temperature of the electrons is a freely variable quantity whereas, in the second model, it is computed from a kinetic energy equation in which phenomenological terms representing thermal conduction and laser energy absorption are introduced. The latter model predicts X-ray emission from a hot-spot of plasma in close agreement with observations from an experiment initiated by focusing 1.9 J of neodymium radiation in a 14 nanosecond pulse onto an aluminum target. Computer solutions to the rate equation model are obtained for a number of different prescribed time variations of the electron temperature. These solutions are compared to a similar set of solutions to a coronal model. It is found that these two sets of solutions differ significantly whenever the electron temperature varies rapidly over subnanosecond periods and the aluminum plasma has not been overheated and driven to the state of total ionization. Author
- Atomic and Molecular Physics and Spectroscopy
- Plasma Physics and Magnetohydrodynamics