Applied Plasma Research

Contains reports on two research projects.National Science Foundation (Grant GK-28282X)M. I. T. Lincoln Laboratory Purchase Order No. CC-54

Microwave reflectometer ionization sensor

The development of the Microwave Reflectometer Ionization Sensor (MRIS) Instrument for use on the Aeroassist Flight Experiment (AFE) spacecraft is described. The instrument contract was terminated, due to cancellation of the AFE program, subsequent to testing of an engineering development model. The MRIS, a four-frequency reflectometer, was designed for the detection and location of critical electron density levels in spacecraft reentry plasmas. The instrument would sample the relative magnitude and phase of reflected signals at discrete frequency steps across 4 GHz bandwidths centered at four frequencies: 20, 44, 95, and 140 GHz. The sampled data would be stored for later processing to calculate the distance from the spacecraft surface to the critical electron densities versus time. Four stepped PM CW transmitter receivers were located behind the thermal protection system of the spacecraft with horn antennas radiating and receiving through an insulating tile. Techniques were developed to deal with interference, including multiple reflections and resonance effects, resulting from the antenna configuration and operating environment

Plasma Dynamics

Contains reports on two research projects.National Science Foundation (Grant GK-37979X1)U. S. Atomic Energy Commission (Contract AT(11-1)-3070

Applied Plasma Research

Contains reports on two research projects.National Science Foundation (Grant GK-28282X1)National Science Foundation (Grant GK-33843)U. S. Army - Research Office - Durham (Contract DAHC04-72-C-0044

Plasma Dynamics

Contains reports on four research projects.National Science Foundation (Grant GK-37979X)U.S. Atomic Energy Commission (Contract AT(11-1)-3070

Applied Plasma Research

Contains research objectives, summary of research and reports on three research projects.National Science Foundation (Grant GK-28282X)M.I.T. Lincoln Laboratory Purchase Order No. CC-54

Applied Plasma Research

Contains research objectives and reports on three research projects.National Science Foundation (Grant GK-10472)Lincoln Laboratory, M. I. T. (P. O. No. A-3393