Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dpprp1088f&link_type=abstract
American Physical Society, 44th Annual Meeting of the Division of Plasma , abstract #RP1.088
Astronomy and Astrophysics
Astrophysics
Scientific paper
Radiation-dominated, photoionized plasmas are important in many astrophysical systems, such as black hole and neutron star accretion disks. Scaled laboratory experiments carried out by our collaboration are providing the first benchmark data for these plasmas. The experiments use 10^14 W X-ray pulses from wire-array Z pinches to photoionize uniform, low-density samples of iron co-mixed with low-Z tracer elements. Rad-hydro modeling indicates a period of photoionization equilibrium shortly after the peak of the X-ray pulse. During this equilibrium the key parameters are measured: the X-ray source has a near-blackbody spectrum with T ˜ 160 eV and a superthermal enhancement above 2 keV; the X-ray flux at the sample is about 3.0 × 10^12 W/cm^2; and the electron density is about 2.5 × 10^19 cm-3. The corresponding photoionization parameter (ξ ≡ 4 π × flux/density 20) is astrophysically relevant. The Fe sample absorption and re-emission spectra are both measured and provide a wealth of data on the ionization and atomic kinetics. This poster will present an update on the latest data analysis and comparisons with various models.
Foord Mark E.
Heeter Robert F.
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