Showing papers by "Christina Back published in 1994"
TL;DR: In this article, the authors measured the rear x-ray flux of burnthrough foils, planar free-standing Au foils and planar CA-supported CA foils with one smoothed beam of Nova which provided ∼ 3300 J of 2ω0 light in a 1 nsec square pulse.
Abstract: The experiments reported in this paper were undertaken to measure the rear x-ray flux of foils having different thicknesses. The targets were burnthrough foils, planar free-standing Au foils and CH supported Au foils, that were nearly entirely ablated during the laser pulse. The x-ray flux from the non-irradiated rear side is of sufficient intensity that it can serve as an x-ray heating source, backlight, or photon pump. The foils were irradiated with one smoothed beam of Nova which provided ∼ 3300 J of 2ω0 light in a 1 nsec square pulse. The primary diagnostics measured absolute flux and transmitted laser light. The time-dependent absolute flux measurements, the total-integrated energy of the x-ray spectrum, and the temporal evolution will be discussed.
16 citations
TL;DR: In this paper, high-resolution absorption spectra of radiatively-heated low-Z foils (CH and BN) have been recorded at the Nova II laser facility by a grazing-incidence spectrograph.
Abstract: High-resolution absorption spectra of radiatively-heated low-Z foils (CH and BN) have been recorded at the Nova II laser facility by a grazing-incidence spectrograph. Using a calibration curve for Kodak 101 photographic plates, the plate density was converted to relative intensity transmitted by the foil. Absorption spectra are presented for the elements B, C, and N. The absorption features near the nickel L edge in the wavelength region 11–15 A are also presented.
9 citations
TL;DR: In this paper, the morphology of the 33.8 A emission from laser-irradiated targets was studied using a concave mirror with a W/B4C multilayer coating.
Abstract: The morphology of the 33.8 A emission from laser‐irradiated targets was studied using a concave mirror with a W/B4C multilayer coating. The mirror had peak normal‐incidence reflectance of 1.8% at a wavelength of 33.8 A. The emissions from a variety of targets were imaged on film with a spatial resolution of 30 μm in the target plane. Radiatively heated, low‐density plastic and silica foams, x‐ray laser targets, and a gas‐filled enclosure were imaged. Several targets were simultaneously imaged at wavelengths of 33.8 and 130 A using two normal‐incidence microscopes.
5 citations
TL;DR: In this paper, a space-resolved electron density diagnostic of a holmium laser-produced plasma has been performed using the intensity ratios of Cu I-like 3[ital d][sup 10]4[ital l]-3[ital D][Sup 10] 4[ital nl] levels with [ital n]=4,5 and [ital l]=[ital s],[ital p],[ital d],[ital f].
Abstract: A space-resolved electron density diagnostic of a holmium laser-produced plasma has been performed using the intensity ratios of Cu I--like 3[ital d][sup 10]4[ital l]-3[ital d][sup 10]4[ital l][prime] lines. The atomic theoretical model of the Cu I--like ion included the 3[ital d][sup 10][ital nl] levels with [ital n]=4,5 and [ital l]=[ital s],[ital p],[ital d],[ital f]. The effect of line absorption at high electron densities is discussed and the atomic data obtained with the HULLAC computer code are compared with previously published data.
3 citations
11 Nov 1994
TL;DR: In this article, a concave mirror with a W/B4C multilayer coating was used to measure the peak normal-incidence reflectance of 1.8% at a wavelength of 33.8 angstroms.
Abstract: The 33.8 angstroms emission from laser-irradiated targets was studied using a concave mirror with a W/B4C multilayer coating. The mirror had peak normal-incidence reflectance of 1.8% at a wavelength of 33.8 angstroms. Imaged were radiatively heated, low-density plastic and silica foams, x-ray laser targets, and a gas-filled enclosure.© (1994) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.