Dr. Saleh S. Alatabi Profile

Dr. Saleh S. Alatabi

at Imperial College London

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Proceedings Article | 3 May 2013 Paper

King's College laser plasma x-ray source design

Radhwan Alnaimi, Daniel Adjei, Saleh Alatabi, Indika Arachchi Appuhamilage, Alan Michette

Proceedings Volume 8777, 87770U (2013) https://doi.org/10.1117/12.2027264

KEYWORDS: Plasma, X-rays, Particles, Extreme ultraviolet, Mirrors, X-ray sources, Carbon, Video, Reflectivity, Glasses

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The aim of this work is to design and build a source for a range of applications, with optimized multilayer structures in order to use the source output as efficiently as possible. The source is built around a Nd:YAG laser with fundamental wavelength 1064 nm, frequency doubled 532 nm (green) and tripled 355 nm, with a pulse length of about 800 ps and a repetition rate up to 50 Hz. The target material is Mylar (C₁₀H₈O₄) tape, which is cheap, readily available and has many benefits as explained in this article. A versatile cubic target chamber and a set of computer controlled stage motors are used to allow positioning of the X-ray emission point. A range of measures is used to protect delicate components and optics, including a glass slide between the focusing lens and the target to prevent the lens being coated with debris. A low pressure gas (typically 3–6 mbar) is used inside the chamber as collision of atomic size debris particles with gas molecules reduces their kinetic energy and consequently their adhesion to the surrounding surfaces. The gas used is typically helium or nitrogen, the latter also acting as a spectral filter. Finally, the chamber is continually pumped to ensure that more than 70% of the debris particles are pumped out of the chamber.

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