Integration of field emitter arrays into spacecraft systems

Details Integration of field emitter arrays into spacecraft systems Integration of field emitter arrays into spacecraft systems

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..608..393m&link_type=abstract

SPACE TECHNOLOGY AND APPLICATIONS INTERNATIONAL FORUM- STAIF 2002. Conference on Thermophyiscs in Microgravity; Conference on In

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Applications

Field Emitters And Arrays, Cold Electron Emitters, Spaceborne And Space Research Instruments, Apparatus, And Components

Scientific paper

Field Emitter Arrays (FEAs) are being developed for electron emission in electrodynamic tether applications. Instead of a single hot (i.e. high powered) emitter or a gas dependant plasma contactor, FEA systems consist of many (up to millions per square centimeter) of small (micron-level) cathode/gate pairs on a semiconductor wafer that effect cold emission at a relatively low voltage. Each individual cathode emits only micro-amp level currents, but a functional array is capable of multiple amp levels. This potentially provides a low power, relatively inexpensive technique for the amp level current emissions required for electrodynamic tether propulsion systems. Critical issues in the development of FEA systems which are discussed here are survivability in ionospheric and spacecraft environments, emission efficiency (i.e. power required to overcome space charge limits in the ionosphere), and electrical integration requirements. Tests of FEA devices are being conducted to evaluate their performance and results to date from these tests will be presented here. .

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