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Measurement of the form and layer thickness of the target spheres for inertial confinement fusion.

Claverley, J D; Coupland, J M*; Leach, R K (2010) Measurement of the form and layer thickness of the target spheres for inertial confinement fusion. NPL Report. ENG 26

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Abstract

The National Physical Laboratory (NPL) and Loughborough University have investigated the use of a number of instruments for the characterisation of the external form and layer thickness of targets used for inertial confinement fusion experiments, as part of the development of the European High Power laser Energy Research (HiPER) facility. The targets are nominally 1.8 mm diameter spherical transparent polymer shells with a wall thickness of approximately 50 µm. Some representative plane samples with varying wall thicknesses were also measured. NPL used a tactile micro-co-ordinate measuring machine to measure the average radius and form of the spherical targets. A scanning laser confocal microscope was used to take qualitative measurements of the target's inner and outer surfaces to investigate the damage caused by tactile probing. The targets and plane samples were also measured on a coherence scanning interferometer and an optical coherence tomography system at Loughborough University. The investigations indicate that the applied probing force associated with the tactile measurements resulted in damage to the samples. The results suggest that current optical technology is capable of producing qualitative images of the target form. Using optical modelling it is proposed that quantitative measurements of internal surfaces can be made from data collected from a modified coherence scanning interferometer.

Item Type: Report/Guide (NPL Report)
NPL Report No.: ENG 26
Subjects: Engineering Measurements
Engineering Measurements > Dimensional
Last Modified: 02 Feb 2018 13:14
URI: http://eprintspublications.npl.co.uk/id/eprint/4784

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