Improved Field-Emission Cathodes
TBMG-7417
09/01/2001
- Content
Microscopic cathodes based on field emission (in contradistinction to thermionic emission) are undergoing development with a view toward using them as miniature or scalable sources of electrons in diverse applications that could include spacecraft thrusters, semiconductor-fabrication equipment, flat-panel display devices, miniature x-ray sources, and electrodynamic tethers and mass spectrometers. Increasing current levels can be accomplished by increasing the number of tips in an array. The basic concepts of utilizing field-emission cathodes for such applications and of scaling up by enlarging arrays are not new; the novel aspect of the present developmental cold cathodes lies in a microfabricated cathode lens and ion repeller (CLAIR) similar to an Einzel lens which will enable the integration of field-emission cathodes with electric propulsion systems, electrodynamic tethers, and instruments while meeting performance and lifetime requirements.
- Citation
- "Improved Field-Emission Cathodes," Mobility Engineering, September 1, 2001.