Using high resolution x-ray spectroscopy of laser and EBIT plasma sources to test atomic models

Details Using high resolution x-ray spectroscopy of laser and EBIT plasma sources to test atomic models Using high resolution x-ray spectroscopy of laser and EBIT plasma sources to test atomic models

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..547..203f&link_type=abstract

ATOMIC PROCESSES IN PLASMAS: Twelfth Topical Conference. AIP Conference Proceedings, Volume 547, pp. 203-216 (2000).

Astronomy and Astrophysics

Astrophysics

1

X-Ray And Gamma-Ray Measurements, Plasma Production And Heating By Laser Beams, Thermodynamics Of Plasmas, X-Ray Spectra

Scientific paper

Understanding of the formation and dynamics of non-LTE plasmas is crucial to inertial and magnetic fusion energy research as well as astrophysical research. The intrinsic complexity of non-LTE systems at high density and the remote nature of x-ray emitting astrophysical plasmas present stringent challenges to our models. Confidence in our atomic kinetics models is gained through comparisons with experimental data from plasmas that are well diagnosed by techniques that are independent of spectroscopic models. To this end experiments with Au foils buried in Be targets have been designed to achieve steady-state, gradient free conditions on the Nova laser. Simulations of the experiments that use detailed atomic kinetics models have shown good agreement with measured x-ray spectra. Large sets of data and many detailed processes are included in these models; issues involving satellite configurations, accuracy of dielectronic recombination rates and non-zero optical depths for resonant lines have to be addressed. To test the detailed atomic data used in the models, experiments have been carried out on an electron beam ion trap (EBIT). The EBIT experiments measure directly the contribution of collisional excitation, dielectronic recombination and radiative recombination to the observed x-ray lines. Good agreement is found between the EBIT spectra and the HULLAC data used to interpret the Nova buried layer experiments. .

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