| Autor: |
B.E. Kahn, Ronald R. Price, Douglas A. Kirkpatrick, P. E. Schoen, B.M. Ditchek, W.B. Stockton, Joel M. Schnur, S. Baral, M. Levinson |
| Rok vydání: |
1991 |
| Předmět: |
|
| Zdroj: |
IEEE Transactions on Plasma Science. 19:749-756 |
| ISSN: |
0093-3813 |
| DOI: |
10.1109/27.108410 |
| Popis: |
Designs, calculations, and initial data are presented from a program investigating the use of biomolecular and eutectic composite microstructures as vacuum field-emission cathodes. Calculations, supported by the initial data, indicate that these electron sources should be capable of macroscopic beam current densities, J>or=100 A/cm/sup 2/, without the formation of a surface plasma. The absence of a plasma allows these cathodes to operate as a long-pulse to DC electron sources. The designs avoid the formation of surface plasma by forcing the current emitted from the tips to transit a thin layer of silicon. The natural high-field current-limiting nature of the silicon serves to prevent the ablation of tip structures and the subsequent formation of cathode plasma. Initial data obtained with these microstructures has demonstrated Fowler-Nordheim characteristic emission. Coated bio-molecular composite cathodes have demonstrated stable DC current densities of approximately 100 mA/cm/sup 2/, and the eutectic composite cathodes have demonstrated similarly stable DC current densities of approximately 1 A/cm/sup 2/. > |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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