In-situ instrumentation for proposed future solar and heliophysics missions close to the sun, e.g., ESA's Solar Orbiter
and NASA's Solar Sentinels, have challenging requirements. Notably, the two major challenges are the large dynamic
range required to be covered and the mission lifetime. For example, the proposed orbit of Solar Orbiter ranges from 0.22
AU to 1.39 AU, resulting in up to 2 orders of magnitude change in flux that the instrument is required to handle, with a
proposed mission life of greater than 10 years. We present details of a prototype instrument that is currently being
developed to address some of these challenges. The instrument is a conventional "top-hat" type symmetric quadrispheric
analyzer with a pair of electrostatic deflector plates designed to accept approximately ± 40° in elevation. Optimization of
the geometry of the deflector plates will be discussed and preliminary results of the performance of the instrument will
be presented. In addition, some of the other techniques and strategies that will be required to deliver the necessary
performance will also be discussed.
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