| Autor: |
Chirko, Konstantin, Gurovich, Victor Ts., Krasik, Yakov E., Peleg, Or, Felsteiner, Joshua, Bernstam, Vladimir |
| Zdroj: |
2004 International Conference on High-Power Particle Beams (BEAMS 2004); 1/ 1/2004, p127-130, 4p |
| Abstrakt: |
Spectroscopic measurements are reported of the plasma formed inside a cathode having a ferroelectric source incorporated in it. The measurements were performed during generation of a high-frequency modulated electron beam in a planar diode with the above cathode. It was found that there is a spatially periodic structure in the plasma density and electric field that vary in the range of 5×1013–3×1014 cm−3 and 0–1 kV/cm, respectively. Plasma electron temperature decreases sharply from 8 eV in the vicinity of the ferroelectric surface to 2 eV in the bulk of the plasma. A qualitative model is suggested, which is based on fast periodic appearance of anomalous plasma resistance. The latter is supposed to be due to generation of ion-acoustic instability, which is controlled by the ratio between the velocities of the current carrying electrons and the ion sound. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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