DEVELOPMENT OF A PROTOTYPE LOW-VOLTAGE ELECTRON ...
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DEVELOPMENT OF A PROTOTYPE LOW-VOLTAGE ELECTRON ...
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DEVELOPMENT OF A PROTOTYPE LOW-VOLTAGE ELECTRON BEAM FREEFORM FABRICATION SYSTEM J.K. Watson*, K.M. Taminger†, R.A. Hafley†, and D.D. Petersen* *
†
NASA Johnson Space Center, Houston, TX 77058 NASA Langley Research Center, Hampton, VA 23681 Abstract
NASA’s Langley Research Center and Johnson Space Center are developing a solid freeform fabrication system utilizing an electron beam energy source and wire feedstock. This system will serve as a testbed for exploring the influence of gravitational acceleration on the deposition process and will be a simplified prototype for future systems that may be deployed during long-duration space missions for assembly, fabrication, and production of structural and mechanical replacement components. Critical attributes for this system are compactness, minimal mass, efficiency in use of feedstock material, energy use efficiency, and safety. The use of a low-voltage (
