DISCHARGE TIME LAGS IN THE MAGNETIC FIELD
Thesis/Dissertation
·
OSTI ID:4701595
The effects of a transverse magnetic field on gaseous discharges in air for coaxial geometry has been investigated by measuring the formative time lags of breakdown as a function of the magnetic field and pressure. The pressures used were atmosphenic and from 90 mm Hg to 1 mm Hg. Overvoltages up to 6% corresponding to time lags of the order of 0.5 mu sec for a gap of 2 mm were used at pressures below 90 mm Hg. The results indicated a slight decrease in time lags when the cathode was contaminated for low-overvoltaged gaps where secondary mechanisms at the cathode are important. The time iags were independent of pressure for a constant overvoitage from 90 mm Hg to 20 mm Hg but increased for pressures below 20 mm Hg. At pressures below 5 mm Hg the time lags decreased rapidly for increased magnetic field followed by a rapid increase producing a resonance'' effect. The decrease in time lags for contaminated gaps is explained in terms of the Malter effect and the decrease of the grazing angle of positive ions on the cathode due to ions being curved by the magnetic field. The magnetic fields aid space-charge buildup, thus aiding the breakdown processes. The large decrease of time lags for increasing magnetic field at low pressures carnot be explained by changes in secondary emission alone and computations of the cyclotron frequency and collision frequency suggest a resonance'' effect where minimum time lags occur whenever cyclotron frequency is of the order of the collision frequency. (Dissertatlon Abstr.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-026736
- OSTI ID:
- 4701595
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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