| Autor: |
Erik Kieft, Karl B. Schliep, Pranav K. Suri, David J. Flannigan |
| Jazyk: |
angličtina |
| Rok vydání: |
2015 |
| Předmět: |
|
| Zdroj: |
Structural Dynamics, Vol 2, Iss 5, Pp 051101-051101-7 (2015) |
| Druh dokumentu: |
article |
| ISSN: |
2329-7778 |
| DOI: |
10.1063/1.4930174 |
| Popis: |
Ultrafast electron microscopes with thermionic guns and LaB6 sources can be operated in both the nanosecond, single-shot and femtosecond, single-electron modes. This has been demonstrated with conventional Wehnelt electrodes and absent any applied bias. Here, by conducting simulations using the General Particle Tracer code, we define the electron-gun parameter space within which various modes may be optimized. The properties of interest include electron collection efficiency, temporal and energy spreads, and effects of laser-pulse duration incident on the LaB6 source. We find that collection efficiencies can reach 100% for all modes, despite there being no bias applied to the electrode. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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