NDLI: REB focusing in high aspect ratio diodes

Content Provider	IEEE Xplore Digital Library
Author	Spence, P. Triebes, K. Genuario, R. Pellinen, D.
Copyright Year	1975
Description	Author affiliation: Phys. Int. Co., San Leandro, CA, USA (Spence, P.; Triebes, K.; Genuario, R.; Pellinen, D.)
Abstract	Typical current-voltage “trajectories” in pinched electron beam diodes have been characterized by a sequence of phases beginning with cathode plasma formation and expansion, a Langmuir-Childs phase, transition to and operation in a focussed beam made (where the cathode plasma is contained in the $B_{θ}$ fields and forced back toward the cathode), and a final impedance collapse phase [1]. Recent experiments with tapered hollow cathodes have addressed the transition phase and indicate that formation of an anode plasma is required (in addition to the current exceeding the Friedlander and Jory critical current, $I_{c})$ before the impedance deviates from a Langmuir-Childs trajectory. Time correlated measurements of beam pinch collapse initiation, proton beam generation, and pinch arrival on axis are given. Once the pinch is formed the impedance is found to be within ±15 percent of the saturated parapotential value for the remainder of the driving pulse. Comparison with previous data indicates that a 300 to 450 J/gm dose is required to form the anode plasma (brass and copper anodes) and suggests that ≈ simultaneous achievement of I ≈ $I_{c}$ and anode plasma formation produces a longer-lived, more stable pinched flow phase.
Starting Page	346
Ending Page	363
File Size	3022127
Page Count	18
File Format	PDF
ISBN	0849369266
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1975-11-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Sandia Laboratories
Subject Keyword	Particle beams Magnetic separation Plasmas Impedance Anodes Cathodes Saturation magnetization
Content Type	Text
Resource Type	Article

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