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| Titel |
X-ray bursts observation along and perpendicularly to the streamer path |
| VerfasserIn |
Pavlo Kochkin, Vung Nguyen, Alexander van Deursen |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052982
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| Zusammenfassung |
| We present measurements of X-ray emission from long laboratory sparks at atmospheric pressure. A 17 kJ Marx generator with a 1.2/52µs pulse shape when unloaded was use to generate 200 surges of positive and negative polarity. The distance between the floating high voltage (HV-) and the grounded (GND-) point electrodes was 108 cm. X-ray bursts were registered by two LaBr3(Ce+) scintillation detectors placed perpendicular to each other. Detector 1 was directed along the breakdown axis and was located beneath the grounded electrode. Detector 2 was perpendicular to the surge at a distance of 140 cm. The current through the GND- and the HV-electrode were recorded together with the x-ray signal. For positive discharges x-ray bursts detection rate was 66% and 64% for detector 1 and detector 2 respectively. In the case of negative discharges the detection rate was 36% and 42%. Timing of X-ray bursts correspond perfectly to streamers occurrence time. For the negative discharges, x-ray radiation was recorded immediately before the cathode current jump, during the negative streamers originated in high-voltage electrode. For the positive discharge time interval of x-ray is wider than for the negative. Most often the x-ray bursts for positive discharges observed during the early growth of cathode current (presumably the streamer phase). In 20% of positive discharges were reported two bursts and 2% three bursts of x-ray radiation during a single discharge. |
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