Transcription of Chapter 3 Basic Plasma Physics - NASA
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Chapter 3 Basic Plasma Physics - NASA
37 Chapter 3 Basic Plasma Physics Introduction Electric propulsion achieves high specific impulse by the acceleration of charged particles to high velocity. The charged particles are produced by ionization of a propellant gas, which creates both ions and electrons and forms what is called a Plasma . Plasma is then a collection of the various charged particles that are free to move in response to fields they generate or fields that are applied to the collection and, on the average, is almost electrically neutral. This means that the ion and electron densities are nearly equal, ni ne, a condition commonly termed quasi-neutrality. This condition exists throughout the volume of the ionized gas except close to the boundaries, and the assumption of quasi-neutrality is valid whenever the spatial scale length of the Plasma is much larger than the characteristic length over which charges or boundaries are electrostatically shielded, called the Debye length.
plasma physics [1–3] and the generation of ion beams [4]. This chapter is . 38 Chapter 3 intended to provide the basic plasma physics necessary to understand the operation of ion and Hall thrusters. The units used throughout the book are ... where the negative sign comes from the convention that the electric field
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