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Ion Thruster Accelerator Grids 241 5. One of the first ion thrusters to fly in space was a cesium surface ionization thruster where cesium ions were pulled from a hot surface by the electric field that also produced the beam. Model the thruster as a diode, with cesium ions at 7.5 mA/cm2 coming from one surface and with the other electrode an accel grid with 80% transparency and a grid gap ādā from the ion source. a. Assuming 100% mass utilization efficiency, neglecting the angular divergence of the beam, and using a 200-V negative bias on the accel grid, what is the voltage, current, thruster diameter, and gap size required to produce 5 mN of thrust at an Isp of 3000 s? b. If the thruster has 95% mass utilization efficiency and a total angular divergence of the beam of 10 deg, how does that change the results of part (a)? c. If it takes 100 W of power to heating the cesium ion-emitting surface to the required surface temperature of about 1350 K, what is the total efficiency of the thruster, using the parameters from part (b)?PDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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