A reaction-rate analysis is used to determine the relative importance of the predominant ionization and loss mechanisms in a neon low-voltage arc. Experimental data are derived from various experiments to determine density, cross section, etc. It is found that the resonance and metastable state atoms are primarily generated in a region near the cathode which corresponds to the "cathode ball-of-fire" region of the lowvoltage arc. The predominant ion-generation process is found to be a result of collisions between exCited atoms which cause the formation of a molecular ion. Direct ionization of ground-state atoms is of secondary but non-negligible, importance. Consideration of quasi-equilibrium multistage ionization shows that, unlike the cesium low-voltage arc, it is unimportant in the neon low-voltage arc. The escape of resonance radiation accounts for approximately one-fifth of the total power loss while ionization accounts for approximately one-eighth. Most of the remaining power loss appears as power dissipation at the anode.
The factors which affect the target-handling capacity of an agile-beam electronically scanned multitarget-tracking radar are reviewed and analyzed. Consideration is given to the choice of strategy for dwell allocation among targets, the choice of trajectory extrapolation algorithms for target tracking, and the determination of saturation target acquisition rates. Emphasis is placed upon radar systems with control computers having limited speed and memory, .and recommendations are made for allocation strategy and targettracking algorithms, based on uniform sampling, to be used in maximizing the target-handling capacity in this situation.Manuscript received February 21, 1971.
A statistical simulation of the low-voltage arc mode of plasma diodes is carried out on a large-scale digital computer to ascertain the importance of various thermalization and transport mechanisms. The computer experiment is two-dimensional and utilizes Monte Carlo techniques to study the low-voltage arc in neon at p=2 Torr, current=4 A, and diode spacing=2.37 cm. Results on the potential distribution, electron-density distribution, and electron-energy density function are presented and discussed. The theoretical results are correlated with experimental results.
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