NDLI: Observation of strong self-focusing of an intense relativistic electron beam impinging on a SiO/sub 2/ target

Content Provider	IEEE Xplore Digital Library
Author	Vermare, C. Donohue, J.T. Labrouche, J. Le Taillandier de Gabory, P. Villate, D.
Copyright Year	1973
Abstract	A substantial reduction in the spot size of an electron beam striking a SiO/sub 2/ target has been observed during a 60 ns pulse. We attribute this to the emission of positive ions, most probably protons, from the target. These are then accelerated upstream and focused along the axis by the electron beam, where they partially neutralize the space-charge of the beam, and produce a sharp pinch. A simulation of the effect with a particle-in-cell code provides an adequate quantitative description, and a simple model, based on space-charge-limited emission of protons by the target confirms qualitatively the results of the simulation. The presence of an aluminum foil on the upstream side of the target is shown to suppress the effect, probably by stopping the protons.
Sponsorship	IEEE Nuclear and Plasma Sciences Society
Starting Page	1501
Ending Page	1509
Page Count	9
File Size	244759
File Format	PDF
ISSN	00933813
Volume Number	27
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Electron beams Protons Ion emission Aluminum Particle beam optics Silicon compounds Heating Acceleration Particle beams Induction machines
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Condensed Matter Physics

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