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Showing 1 to 5 of 5 for “"Retarding Potential Analyzers"”.
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Parameter Estimation from Retarding Potential Analyzers in the Presence of Realistic Noise
Retarding Potential Analyzers (RPA) have a rich flight heritage. These instruments are largely popular since a single current-voltage (I-V) profile can provide in-situ measurements of ion temperature, velocity and composition. The estimation of parameters from an RPA I-V curve is affected by grid …
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Ionospheric Simulator (IonSim): Simulating Ionospheric conditions in a vacuum chamber
… Various space-borne instruments, such as retarding potential analyzers (RPAs) and ion traps are routinely flown in low earth orbit (LEO) to provide data for seeding/improve ionospheric models. This thesis describes and characterizes a new ion source that can be used to test and calibrate …
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A Framework for Validation and Testing of a CubeSat Retarding Potential Analyzer
Traditionally, Retarding Potential Analyzers (RPAs) operate exclusively on large satellites due to the size, power, and mass constraints posed by nano-satellites like CubeSats. These sensors take in-situ measurements of Earth's atmospheric ion current during a range of time-varied ``retarding" …
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Experimental investigation of electron multipactor discharges at very high frequency
… and parallel plate geometries with the use of retarding potential analyzers (RPA). A 1-D particle tracking simulation supports these experimental distributions and yields the underlying physics behind the distribution shape. Experimental and simulation energy distributions have a low energy …
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Electronics for a Versatile and Robust Retarding Potential Analyzer for Nano-Satellite Platforms
A retarding potential analyzer (RPA) is an instrument that, when mounted on a satellite in low-Earth orbit, makes in-situ measurements of ion density, temperature and speed relative to the satellite frame. The instrument works by changing the voltage on one of a set of grids and measuring a …