High energy density science with FELs, intense short pulse tunable X-ray sources
Proceedings of SPIE - The International Society for Optical Engineering 6261 I (2006)
Abstract:
Short pulse (< 100 fs) tunable X-ray and VUV laser sources, based on the free electron laser (FEL) concept, will be a watershed for high energy density research in several areas. These new 4 th generation light sources will have extremely high fields and short wavelength (∼.1 nm) with peak spectral brightness -photons/(s/mrad 2/mm 2/0.1% bandwidth- 10 10 greater than 3 rd generation light sources. We briefly discuss several applications: the creation of warm dense matter (WDM), probing of near solid density plasmas, and laser-plasma spectroscopy of ions in plasmas. The study of dense plasmas has been severely hampered by the fact that laser-based probes that can directly access the matter in this regime have been unavailable and these new 4 th generation sources will remove these restrictions. Finally, we present the plans for a user-oriented set of facilities that will incorporate high-energy, intense short-pulse, and x-ray lasers at the first x-ray FEL, the LCLS to be opened at SLAC in 2009.High-energy density science with FELs: intense short pulse tunable X-ray sources
Proceedings of SPIE SPIE, the international society for optics and photonics 6261 (2006) 626101-626101-12
Line radiation effects in laboratory and astrophysical plasmas
Journal of Quantitative Spectroscopy and Radiative Transfer Elsevier 99:1-3 (2006) 363-369
Radiation transfer effects on the spectra of laser-generated plasmas.
Physical review letters 96:18 (2006) 185002
Abstract:
Experimental x-ray spectra of the H-like 2p --> 1s (Lyman-alpha) doublet have been obtained using time-integrated high-resolution spectroscopy of a constrained-flow, laser-generated aluminum plasma. These spectra show monotonic alteration of the relative intensities of the doublet components with distance from the target surface. Excellent agreement between experiment and theory is found only if the modeling includes both ion collisional rates between the fine-structure components of the level and, more importantly, the radiative pumping of one Lyman-alpha component by the other component along the direction of the major velocity gradient (i.e., perpendicular to the direction of spectra observation). Understanding radiation transfer in plasmas with high velocity gradients is important in modeling many astrophysical objects, and this experiment acts as a benchmark for such complex calculations.Study of X-ray photoionized Fe plasma and comparisons with astrophysical modeling codes
Journal of Quantitative Spectroscopy and Radiative Transfer Elsevier 99:1-3 (2006) 712-729