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192 Chapter 5 hexagonal structure to produce a high transparency to the ions from the plasma generator. These grids are also normally dished to provide structural rigidity to survive launch loads and to ensure that they expand uniformly together during thermal loading [1,3]. The electrical configuration of an ion thruster accelerator is shown schematically in Fig. 5-3. The high-voltage bias supply (called the screen supply) is normally connected between the anode and the common of the system, which is usually connected to the neutralizer cathode (called “neutralizer common”) that provides electrons to neutralize the beam. Positive ions born in the discharge chamber at high positive voltage are then accelerated out of the thruster. The accel grid is biased negative relative to the neutralizer common to prevent the very mobile electrons in the beam plasma from back- streaming into the thruster, which produces localized heating in the discharge chamber by energetic electron bombardment, and ultimately overloads the Anode e− Discharge Supply + Screen Voltage Screen Decel Accel Discharge Cathode Ion Beam e− Neutralizer Cathode Common Space Potential Common Xe+ Screen Supply Accel Grid Supply − Accel Decel Voltage Fig. 5-3. Electrical schematic of a DC discharge ion thruster without the cathode heater and keeper supplies. PotentialPDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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