S. White

A comparison of time-dependent Cloudy astrophysical code simulations with experimental X-ray spectra from keV laser-generated argon plasmas

Nidhi Rathee, F. P. Keenan, R. J. R. Williams, G. J. Ferland et autres

• Photoionized Ar plasma is generated in experiments using X-ray line emission from laser irradiated Ag foils. • This use of line emission source allows keV radiation to dominate over softer X-rays and thus mimics the effect of a blackbody with a …

gb, us (code pays fourni par la source)

Generation of Photoionized Plasmas in the Laboratory of Relevance to Accretion-Powered X-Ray Sources Using Kev Line Radiation

D. Riley, Raj Laxmi Singh, S. White, M. Charlwood et autres

gb, us (code pays fourni par la source)

L-Shell X-Ray Conversion Yields for Laser-Irradiated Tin and Silver Foils

Raj Laxmi Singh, S. White, M. Charlwood, F. P. Keenan et autres

We have employed the VULCAN laser facility to generate a laser plasma X-ray source for use in photoionization experiments. A nanosecond laser pulse with an intensity of order 1015 Wcm−2 was used to irradiate thin Ag or Sn foil targets coated onto …

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Spatially distributed simulations of the effect of snow on mass balance and flooding of Antarctic sea ice

Nander Wever, Katherine Leonard, Ted Maksym, S. White et autres

Abstract Southern Ocean sea ice can exhibit widespread flooding and subsequent snow-ice formation, due to relatively thick snow covers compared to the total ice thickness. Considerable subkilometer scale variability in snow and ice thickness causes poorly constrained uncertainties in determining the amount …

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Measurements of free-free absorption in warm dense aluminium

C. Hyland, S. White, B. Kettle, Regina Irwin et autres

Abstract Extreme ultraviolet radiation from a high harmonic source has been used to measure the free-free attenuation coefficient and real refractive index of warm dense aluminium, with sample conditions of near solid density and temperature of 0.9 ± 0.23 eV. These were …

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Snow and ice thickness measurements from Terrestrial Laser Scanning, Magnaprobe and GEM-2 on ice stations PS81/503, PS81/506 and PS81/517 from Weddell Sea, Antarctica, 2013

Nander Wever, S. White, Priska A Hunkeler, Ted Maksym et autres

Spatial snow and ice thickness measurements from ice stations PS81/503, PS81/506 and PS81/517 from Research Vessel Polarstern in the Antarctic Weddell Sea in austral winter 2013 (cruise leg ANT-XXIX/6, AWECS campaign). Terrestrial laser scanning (TLS) was used to determine the snow surface …

Snow density and grain size measurements from Snow Micro Pen (SMP) on ice stations PS81/517 and PS81/518 from Weddell Sea, Antarctica, 2013 - links to original files

Nander Wever, Katherine Leonard, S. White, Martin Proksch

This dataset contains SnowMicroPen (SMP) measurements on sea ice stations PS81/517 and PS81/518 from Research Vessel Polarstern in the Antarctic Weddell Sea in austral winter 2013 (cruise leg ANT-XXIX/6, AWECS campaign). The SMP surveyed the uppermost approximately 25-30 cm of the snow …

Generation of photoionized plasmas in the laboratory: Analogues to astrophysical sources

S. White, R. Irwin, Richard Warwick, G. Sarri et autres

Abstract Implementation of a novel experimental approach using a bright source of narrowband x-ray emission has enabled the production of a photoionized argon plasma of relevance to astrophysical modelling codes such as Cloudy. We present results showing that the photoionization parameter ζ …

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Using a commercial mini-X-ray source for calibrating Bragg crystals

F. Valle Brozas, C. Hyland, S. White, S. Warnock et autres

In this paper we describe a procedure for calibration of Bragg crystals used for X-ray spectroscopy of laser plasmas. The method uses a relatively inexpensive commercially available X-ray source. By using the source to pump a metallic foil such as vanadium or …

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Fielding of a large gas cell for fine pressure control in collisionless shock laser plasma experiments

Tom Hodge, H. Ahmed, E. Aktan, A. Alejo et autres

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Linking Chaotic Advection with Subsurface Biogeochemical Processes

D. C. Mays, Vicky L. Freedman, S. White, Yang Fang et autres

Experimental measurements of the collisional absorption of XUV radiation in warm dense aluminium

B. Kettle, T. Dzelzainis, S. White, Lisha Li et autres

The collisional (or free-free) absorption of soft x rays in warm dense aluminium remains an unsolved problem. Competing descriptions of the process exist, two of which we compare to our experimental data here. One of these is based on a weak scattering …

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