NEW EXPERIMENTAL RESULTS FOR PLASMA ELECTRON OSCILLATIONS
Journal Article
·
· J. Electronics and Control
Experimental investigations are reported on plasma electron oscillations in low-pressure mercury vapor discharges with plane oxide coated cathodes. The appearances of some of the discharges are described. The primary electrons were deviated laterally in or near the meniscus-shaped region of ionized gas brighter than the surrounding plasma, which appeared a few millimeters from the cathode. Variation of anode-cathode separation was found to have a marked effect on both the appearance if the deflected beams and the meniscus, and on the highfrequency oscillatory properties of the discharges. Measurements of plasma electron concentration and temperature were made simultaneously with measurements of oscillation intensity and frequency. A strong tendency was found for the oscillations to grow in amplitude when the beam of primary electrons moved down a concentration gradient and to die out when the beam moved up a gradient. The frequency of the oscillation was found to agree closely with that calculated from the Langmuir formula, using the plasma electron concentration at the position of appearance of the oscillation. Several checks were applied to the measurements of concentration, including measurements of the positive ion current flowing to a probe and measurements with double probes. (auth)
- Research Organization:
- Queen's Univ., Belfast
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-014495
- OSTI ID:
- 4141074
- Journal Information:
- J. Electronics and Control, Journal Name: J. Electronics and Control Vol. Vol: (1) 6
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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