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10 May 2004

Volume 84, Issue 19, pp. 3723-3937

Issue Cover Spotlight Figure

Appl. Phys. Lett. 84, 3933 (2004); http://dx.doi.org/10.1063/1.1745103 (3 pages)

A. Cassinese, G. M. De Luca, A. Prigiobbo, M. Salluzzo, and R. Vaglio
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Experimental investigation of coherent structures in a low-energy electron beam

G. Bettega, F. Cavaliere, A. Illiberi, R. Pozzoli, M. Romé, M. Cavenago, and Yu. Tsidulko

Appl. Phys. Lett. 84, 3807 (2004); http://dx.doi.org/10.1063/1.1741029 (3 pages) | Cited 5 times

Online Publication Date: 29 April 2004

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A sharp transition to a space-charge dominated regime is induced in a low-energy electron beam produced in a Malmberg–Penning trap by increasing the emission current of the source. The transition is characterized by the appearance of a region, around the axis of the beam, not accessible to beam electrons, and by the fast development of coherent structures in the remaining electron plasma, due to the sharp increase of local vorticity. The results are interpreted in the framework of a cold fluid drift–Poisson model, and using a three-dimensional particle-in-cell simulation code. © 2004 American Institute of Physics.
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29.25.Ni Ion sources: positive and negative
52.50.Dg Plasma sources
52.65.Rr Particle-in-cell method
52.59.Sa Space-charge-dominated beams
07.77.Ka Charged-particle beam sources and detectors
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