Delta 50-820 User Manual download pdf (Page 15)

Mueller, Ziemer, Hofer, Wirz, O’Donnell 15

Survey of Micro-Thrust Propulsion Options

Cube Sat - 5’th Annual Developers Workshop 2008

Micro-fabricated Colloid and FEEP

Fuel Tank

Manifold

Spout

Channel

Clip

system

Fuel Inlet

Description:

•

Micromachined versions of colloid thruster technology.

•

Micromachining allows for the precise fabrication of a much

greater number of emitters than in conventional approaches.

•

Since emitter tips are on micron-scale for conventional architectures,

increased number of emitter tips may result in increased thrust levels

at smaller device mass and volume for micromachined devices.

Status:

•

Laboratory development -

feasibility studies.

•

Micro-colloid/FEEP work past and ongoing at MIT (in collaboration Yale

Busek Corp.), Almeda Applied Sciences (AASC), JPL, SRI International,

Sandia, U. Southampton/UK, Kings College/UK.

•TRL ~2-3.

Key Technology Characteristics:

•

Application: Constellation control, even of large constellation craft,

attitude control, small delta-v of micro/nanosats (constellations).

•

Very high precision thrust and impulse bits.

•

Widely scalable thrust levels by adjusting number of emission sites

per chip.

•

Relatively high thrust-to-power for electrostatic devices (colloids, not FEEPs).

•

Compact propellant storage.

•

Low TRL -

requires substantial development.

•

Neutralizer development, contamination studies, etc. required as

for

larger scale devices.

MIT Micro-Colloid Concept

JPL Micro-Colloid Test Fabrication Articles

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