On-a-chip microdischarge thruster arrays inspired by photonic device technology for plasma television


Grubisic, Angelo N, Gabriel, Stephen B, Jiang, Liudi, Cranny, Andrew, Kraft, Michael and White, Neil (2009) On-a-chip microdischarge thruster arrays inspired by photonic device technology for plasma television.

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Description/Abstract

This study shows that the practical scaling of a hollow cathode thruster device to MEMS level should be possible albeit with significant divergence from traditional design. The main divergence is the need to operate at discharge pressures between 1-3bar to maintain emitter diameter pressure products of similar values to conventional hollow cathode devices. Without operating at these pressures emitter cavity dimensions become prohibitively large for maintenance of the hollow cathode effect and without which discharge voltage would be in the hundreds of volts as with conventional microdischarge devices. In addition this requires sufficiently constrictive orifice diameters in the 10μm – 50 μm range for single cathodes or <5μm larger arrays. Operation at this pressure results in very small Debye lengths (4 -5.2pm) and leads to large reductions in effective work function (0.3 – 0.43eV) via the Schottky effect. Consequently, simple work function lowering compounds such as lanthanum hexaboride (LaB6) can be used to reduce operating temperature without the significant manufacturing complexity of producing porous impregnated thermionic emitters as with macro scale hollow cathodes, while still operating <1200°C at the emitter surface. The literature shows that LaB6 can be deposited using a variety of standard microfabrication techniques.

Item Type: Monograph (Technical Report)
Related URLs:
Keywords: Ariadna, Microthruster, Hollow cathode thruster, Propulsion technology, MEMS
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science > NANO
Faculty of Physical Sciences and Engineering > Electronics and Computer Science > EEE
ePrint ID: 268040
Date Deposited: 09 Oct 2009 14:10
Last Modified: 27 Mar 2014 20:14
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/268040

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