https:\/\/doi.org\/10.59332\/jbis-078-10-0344<\/a><\/b><\/p>\nThe Pegasus is a theoretical spacecraft concept design for a mission to the nearest stars. It is powered by a fusion\u00a0engine, where lasers are used to implode small mg scale capsules to high density and temperature so that thermonuclear\u00a0ignition may occur. In this paper we describe the Representative Physics Model (RPM) that was developed for the\u00a0Pegasus propulsion and ignition system, in terms of the capsule design. The method that was adopted is known as inertial\u00a0confinement fusion via direct drive illumination. We describe the key equations and how the designs were scaled up from\u00a0recent experiments conducted at the National Ignition Facility whilst also being scaled down versions of the Daedalus\u00a0second stage design. The analysis model that is developed is an approximation rather than exact solutions. The two\u00a0capsule sizes adopted were 72 mg and 28.8 mg driven by an input energy of 145 MJ and 73 MJ respectively. Although still\u00a0far from the existing state-of-art technological capability, the models developed were highly conservative and not overly\u00a0optimistic in terms of the potential gain, but this was to remain as close as possible to the modern technological state of\u00a0art. However, in the future, in terms of energy gain a capsule performance much higher than is shown in this work will\u00a0likely be possible, which will also minimise the propulsion requirements. This paper is a final contribution to Project Icarus.<\/p>\n
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