The NASA GSFC MEMS Colloidal Thruster

A number of upcoming missions require different thrust levels on the same spacecraft. A highly scaleable and efficient propulsion system would allow substantial mass savings. One type of thruster that can throttle from high to low thrust while maintaining a high specific impulse is a Micro-Electro-Mechanical System (MEMS) colloidal thruster. The NASA GSFC MEMS colloidal thruster has solved the problem of electrical breakdown to permit the integration of the electrode on top of the emitter by a novel MEMS fabrication technique. Devices have been successfully fabricated and the insulation properties have been tested to show they can support the required electric field. A computational finite element model was created and used to verify the voltage required to successfully operate the thruster. An experimental setup has been prepared to test the devices with both optical and Time-Of-Flight diagnostics.

[1]  Vlad Hruby,et al.  Micro Newton Colloid Thruster System Development , 2001 .

[2]  J. Mora,et al.  The current emitted by highly conducting Taylor cones , 1994, Journal of Fluid Mechanics.

[3]  G. Taylor,et al.  The stability of a horizontal fluid interface in a vertical electric field , 1965, Journal of Fluid Mechanics.

[4]  C. Beichman,et al.  The Terrestrial Planet Finder (TPF) : a NASA Origins Program to search for habitable planets , 1999 .

[5]  Manuel Martinez-Sanchez,et al.  The Concept and Development of a Micro-fabricated Colloid Thruster Array , 2003 .

[6]  Bob Stevens,et al.  Fabrication and Operation of Micro-fabricated Colloid Thruster Arrays , 2003 .

[7]  C. T. Norgren,et al.  Experimental analysis of the exhaust beam from a colloid thrustor. , 1964 .

[8]  Robert A. Laskin,et al.  Space Interferometry Mission: measuring the Universe , 1999, IMTC/99. Proceedings of the 16th IEEE Instrumentation and Measurement Technology Conference (Cat. No.99CH36309).

[9]  Nathaniel Demmons,et al.  Micro Newton Colloid Thruster System Development for ST7-DRS Mission , 2003 .

[10]  N. Klein,et al.  The mechanism of self-healing electrical breakdown in MOS structures , 1966 .

[11]  Manuel Gamero-Castaño,et al.  MICRO NEWTON COLLOID THRUSTER FOR ST7-DRS MISSION , 2003 .

[12]  Gary Hinshaw,et al.  Taking the Measure of the Universe , 2003 .

[13]  Michael L. Gross,et al.  Nanospray Electrospray Ionization Development , 2002 .

[14]  John Zeleny,et al.  The Electrical Discharge from Liquid Points, and a Hydrostatic Method of Measuring the Electric Intensity at Their Surfaces , 1914 .

[15]  Alan G. R. Evans,et al.  Realisation of very high voltage electrode-nozzle systems for MEMS , 2004 .