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182 Chapter 4 electron density, and hence double-ion content, on the thruster centerline. Wirz and Goebel [66] developed “modified” NSTAR designs that guide primary electrons away from the thruster centerline to improve the profile. These designs were validated by experiments [67], and also resulted in lower double- ion content and higher neutral density along the thruster axis as predicted by the model. References [1] H. R. Kaufman, “An Ion Rocket with an Electron-Bombardment Ion Source,” NASA Technical Note, D-585, January 1961. [2] P. D. Reader, NASA Technical Note, TN D-1162, 1962. [3] R. T. Bechtel, “Discharge Chamber Optimization of the Sert-II Thruster,” Journal of Spacecrafts and Rockets, vol. 5, p. 795–800, 1968. [4] W. Knauer, R. L. Poeschel, and J. W. Ward, “The Radial Field Kaufman Thruster,” AIAA-1969-259, 7th Electric Propulsion Conference, Williamsburg, Virginia, March 3–5, 1969. [5] R. D. Moore, “Magneto-Electrostatic Contained Plasma Ion Thruster,” AIAA-1969-260, 1969. [6] J. S. Sovey, “Improved Ion Containment Using a Ring-Cusp Ion Thruster,” Journal of Spacecraft, vol. 21, pp. 488–495, 1984. [7] J. S. Sovey and H. J. King, “Status of 30-cm Mercury Ion Thruster Development,” NASA TMX-71603, October 1974. [8] T. D. Masek, R. L. Poeschel, C. R. Collett, and D. E. Snelker, “Evolution and Status of the 30-cm Engineering Model Ion Thruster,” AIAA-1976- 1006, International Electric Propulsion Conference, Key Biscayne, Florida, November 14–17, 1976. [9] V. K. Rawlin, “Operation of the J-Series Thruster Using Inert Gases,” AIAA-1982-1929, International Electric Propulsion Conference, New Orleans, Louisiana, November 17–19, 1982. [10] J. R. Beattie and J. N. Matossian, “Inert-Gas Ion Thruster Technology,” NASA CR191093, March 1993. [11] J. R. Beattie and R. L. Poeschel, “Ring-Cusp Ion Thrusters,” Paper 84-71, International Electric Propulsion Conference, May 1984. [12] J. N. Matossian and J. R. Beattie, “Characteristics of Ring-Cusp Discharge Chambers,” Journal of Propulsion and Power, vol. 7, pp. 968–974, 1991. [13] M. J. Patterson, T. W. Haag, V. K. Rawlin, and M. T. Kussmaul, “NASA 30-cm Ion Thruster Development Status,” AIAA-1994-2849, 30th Joint Propulsion Conference, Indianapolis, Indiana, June 1994.PDF Image | Fundamentals of Electric Propulsion: Ion and Hall Thrusters
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