Autonomous systems are increasingly used to provide situational awareness and long-term environment monitoring. Photovoltaics (PV) are favored as a long-endurance power source for many of these applications. To date, the use of PV is limited to space and terrestrial (dry-land) installations. The need for a persistent power source also exists for underwater (UW) systems, which currently rely on surface PV arrays or batteries. In this paper, we demonstrate that high-bandgap-InGaP solar cells can provide useful power UW.
We present the design and operation of a test cassette for exposure of samples to radiation environments at the National Ignition Facility. The samples had normal lines of sight to the x-ray source in order to have uniform x-ray illumination. The incident x-radiation onto the samples was determined by the choice of filter thicknesses and materials. The samples were held at precise locations in the target chamber in order to have a known fluence incident. In the cassette, the samples were held in place in such a way that a minimal 'line contact' allows them to have the maximal mechanical response to the x-ray load. We present post-shot images of the debris found on films used for filters, and pre-and post-exposure specimens.
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