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Transport of long-pulse, high-current electron beams in preformed monoatomic plasma channels in the ion focus regime

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2 Author(s)
Miller, J.D. ; US Naval Surface Warfare Center, Silver Spring, MD, USA ; Gilgenbach, R.M.

Experiments have been performed demonstrating the efficient transport of long-pulse, high-current electron beams in well-diagnosed, preformed plasma channels. Channels were created by the low-energy electron-beam ionization of low-pressure monatomic gases. These transport efficiencies are comparable to the optimum values obtained for similar pulse lengths in previous long pulse, electron-beam transport experiments in laser-preionized diethylaniline gas. Experimental results show the development of both transverse current centroid oscillations characteristic of the ion hose instability and the microwave emission indicative of relativistic electron beam-plasma electron two-stream instability. Significant microwave emission indicating rapid growth of the two-stream instability has been observed in the S-band when the space-charge neutralization fraction fe exceeds unity

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Plasma Science, IEEE Transactions on  (Volume:18 ,  Issue: 3 )