| Autor: |
R.N. Ridlon, R.L. Carlson, Gerald J. Seitz, T.P. Hughes |
| Rok vydání: |
2002 |
| Předmět: |
|
| Zdroj: |
Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167). |
| DOI: |
10.1109/pac.1997.752831 |
| Popis: |
An electron-beam-pumped laser operating at ArF (193 nm) producing up to 5.0 joules in a 150-ns pulse has been used to illuminate micro-machined aluminum cathodes. The cathode was pulsed from 2.25- up to 2.95-MV across a 20-cm-AK gap producing fields up to 145 kV/cm using REX (a 4-MeV, 5-kA, 100-ns pulsed diode). Extracted current versus laser power gives a quantum efficiency increasing with power density from 0.07 to O.11 percent. The present work is significant in that the cathode operates in the presence of out-gassing materials with a background vacuum pressure in the mid 10/sup -6/ torr region and 100-ns-long electron beams of up to 3 kA have been produced. Both emission limited (current follows laser pulse) and space-charge-limited (current follows pulsed power) regimes have been studied up to /spl sim/50 A/cm/sup 2/ by varying the cathode diameter. The beam temperature has been measured to be |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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