| Autor: |
Onoi, M., Azuma, K., Fujiwara, E., Yatsuzuka, M. |
| Zdroj: |
2000 13th International Conference on High-Power Particle Beams; 1/ 1/2000, p918-921, 4p |
| Abstrakt: |
The temporal and spatial evolution of gas discharge induced by a high-power, short-pulsed microwave (HPM) was observed by a high-speed image converter camera. The HPM with the peak power of 20MW, frequency of 13GHz, and pulse duration of 14ns was irradiated uniformly into a gap between two spherical electrodes biased to a DC voltage less than a gap breakdown voltage. The streak pictures show two different breakdown mechanisms depending on air pressure. In the high-pressure region over about 300 Torr, the microwave-induced discharge begins at the several spots on the gap axis. When these local discharges grow to link together each other, the gap breakdown occurs. The gap breakdown is delayed about 30 – 300 ns depending on gas pressures and applied DC voltages. In the low-pressure region less than 300 Torr, on the other hand, two-stage breakdown occurs. In the first-stage, a single large discharge luminescence appears in the gap center at the same time as the microwave injection and is followed by another discharge between the first discharge and both electrodes. After a few microseconds of the first-stage discharge, the second-stage discharge following the gap breakdown appears. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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