Picture of DNA strand

Pioneering chemical biology & medicinal chemistry through Open Access research...

Strathprints makes available scholarly Open Access content by researchers in the Department of Pure & Applied Chemistry, based within the Faculty of Science.

Research here spans a wide range of topics from analytical chemistry to materials science, and from biological chemistry to theoretical chemistry. The specific work in chemical biology and medicinal chemistry, as an example, encompasses pioneering techniques in synthesis, bioinformatics, nucleic acid chemistry, amino acid chemistry, heterocyclic chemistry, biophysical chemistry and NMR spectroscopy.

Explore the Open Access research of the Department of Pure & Applied Chemistry. Or explore all of Strathclyde's Open Access research...

Bremsstrahlung emission profile from intense laser-solid interactions as a function of laser focal spot size

Armstrong, C D and Brenner, C M and Zemaityte, E and Scott, G G and Rusby, D R and Liao, G and Liu, H and Li, Y and Zhang, Z and Zhu, B and Bradford, P and Woolsey, N C and Oliveira, P and Spindloe, C and Wang, W and McKenna, P and Neely, D (2019) Bremsstrahlung emission profile from intense laser-solid interactions as a function of laser focal spot size. Plasma Physics and Controlled Fusion, 61 (3). ISSN 0741-3335

[img]
Preview
Text (Armstrong-etal-PPCF2018-Bremsstrahlung-emission-profile-from-intense-laser-solid)
Armstrong_etal_PPCF2018_Bremsstrahlung_emission_profile_from_intense_laser_solid.pdf
Final Published Version
License: Creative Commons Attribution 3.0 logo

Download (745kB)| Preview

    Abstract

    The bremsstrahlung x-ray emission profile from high-intensity laser-solid interactions provides valuable insight to the internal fast electron transport. Using penumbral imaging, we characterise the spatial profile of this bremsstrahlung source as a function of laser intensity by incrementally increasing the laser focal spot size on target. The experimental data shows a dual-source structure; one from the central channel of electrons, the second a larger substrate source from the recirculating electron current. The results demonstrate than an order of magnitude improvement in the intensity contrast between the two x-ray sources is achieved with a large focal spot, indicating preferable conditions for applications in radiography. An analytical model is derived to describe the transport of suprathermal electron populations that contribute to substrate and central channel sources through a target. The model is in good agreement with the experimental results presented here and furthermore is applied to predict laser intensities for achieving optimum spatial contrast for a variety of target materials and thicknesses.