The current state-of-the-art in ultra high energy (UHE) suborbital payloads -The Antarctic Impulsive Transient Antenna (ANITA) has saturated the available payload weight and envelope size for a Long Duration Balloon (LDB). The effective collection area for ANITA-2 is on the order of 1 square meter and the only way to improve sensitivity for ANITA-like missions is to increase the effective aperture size of the antenna. The largest available space on a balloon-borne system is the balloon itself, suggesting that a section of the balloon surface be used as a reflector. The confluence of the scientifically driven need to improve neutrino sensitivity for ANITA-like missions and the emergence of super-pressure balloon (SPB) technology leads to the next generation balloon-borne detector that we denote as The ExaVolt Antenna (EVA). EVA is an UHE particle observatory, currently under development for NASA's suborbital super-pressure program in Antarctica that aims to increase the effective collection area by a factor of 100. EVA's design is based on a novel application of toroidal reflector optics which utilizes a super-pressure balloon surface, along with a feed-array mounted on an inner membrane, to create an ultra-large radio antenna system with a synoptic view of the Antarctic ice sheet below it. The resulting balloon system is a large deployable structure that leads to some challenging analysis related to its design. In this paper, we will study aspects related to the stability and deployment of the EVA balloon/antenna system.
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