Paulo C. Lozano

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The feasibility of electrostatically extracting and accelerating ions from room temperature ionic liquids in a high vacuum environment is investigated using externally wetted emitters similar to those manufactured for liquid metal ion sources, made out of tungsten wire and electrochemically treated to produce a sharp tip and to increase surface wettability.(More)
The problem of electrochemical decomposition due to extraction of single polarity ions from a novel ionic liquid ion source (ILIS) is solved by periodically alternating the voltage source so that the potential difference that appears across the double layer formed between the emitter conductive material and the liquid is maintained below the electrochemical(More)
Electrosprays are devices in which nanometer sized droplets and/or solvated ions are electrically extracted from a liquid surface and accelerated to high velocities. They are usually constructed from conductive capillaries with one of the ends tapered down to a sharp tip with the purpose of enhancing the local electric field that produces the instability(More)
The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. ABSTRACT We have developed a mission concept that uses 3-unit cubesats to perform new measurements of lunar magnetic fields, less than 100 meters above the Moon's surface. The mission calls for sending the cubesats on impact trajectories to(More)
Computational models of complex phenomena are an important resource for scientists and engineers. However, many state-of-the-art simulations of physical systems are computationally expensive to evaluate and are black box—meaning that they can be run, but their internal workings cannot be inspected or changed. Directly applying uncertainty quantification(More)
This thesis addresses problems in planning and control of autonomous agents. The central theme of this work is that integration of " low-level control synthesis " and " high-level decision making " is essential to devise robust algorithms with provable guarantees on performance. We pursue two main directions here. The first part considers planning and(More)
High specific impulse electric propulsion systems enable ambitious lunar and inter-planetary missions that return a wealth of scientific data. Many of these technologies are difficult to scale down, meaning the spacecraft are relatively massive and expensive. The Space Propulsion Lab (SPL) at the Massachusetts Institute of Technology (MIT) is developing(More)
Space systems are inherently difficult to verify prior to launch due to the challenges of replicating the space environment through ground testing. The SPHERES testbed on the International Space Station has provided a risk-tolerant test facility for evaluating enabling technology. The operational execution of the SPHERES facility has resulted in the(More)