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392 Chapter 7 e. If the walls are made of BNSiO2, what is the anode current? Why does it depend so strongly on the wall material? 9. Calculate the power lost to the wall in a xenon TAL thruster with stainless steel walls that has a plasma density at the sheath edge of 2 1017 m–3 and an electron temperature of 20 eV. The channel has a 12-cm outside diameter, an 8-cm inside diameter, and is 0.5-cm long. Which power loss channel (ions or electrons) is larger? 10. The life of a TAL thruster is limited primarily by the ion sputtering of the metallic guard rings next to the thruster exit. Assume a TAL has a plasma density near the wall of 1017 m–3 and an electron temperature of 25 eV. a. For stainless steel walls, what is the ion current density to the walls (the guard rings) and the sheath potential? b. Assuming that the stainless-steel sputtering yield is about 0.1 atoms per incident ion at the sheath voltage found in (a), what is the life in hours of the TAL if 2-mm thickness of the stainless-steel guard ring material can be eroded away? c. Assume that the wall material has been changed to graphite with a secondary electron yield of about 0.5. What is the sheath potential at the wall? d. Assuming that the graphite sputtering yield is about 5 10–3 atoms per incident ion at the sheath voltage found in (c), what is the life in hours of the TAL if 1-mm thickness of the graphite guard ring material can be eroded away?PDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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