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Ion beam divergence due to plasma heating in the Ampfion diode

Published online by Cambridge University Press:  09 March 2009

Craig L. Olson
Craig L. Olson
Affiliation:
Plasma Theory Division 1241, Sandia National Laboratories, Albuquerque, New Mexico 87185
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Abstract

In the Ampfion diode, an ion beam is extracted from an anode plasma that is being pushed away from the cathode by a rising magnetic field. There is concern that ion heating in the anode plasma sheath may result in a significant ion beam divergence. To investigate this possibility, a comparison of Z pinches, θ pinches, and Ampfion is made. Ampfion sheath scenarios are examined and a simple argument is presented that indicates that an anomalous resistivity should develop. An upper bound estimate of the ion divergence is calculated, and examples are given for PBFA-II parameters. For a small radius diode with a high density anode plasma, it is shown that ion beam divergence due to plasma heating should not be a problem. For a large radius diode with a low density anode plasma, it is shown that ion beam divergence due to plasma heating is a problem, but that an Ampfion filtering mechanism should select a cool portion of the heated ions and help to alleviate this problem.

Type
Research Article
Information
Laser and Particle Beams , Volume 2 , Issue 3 , August 1984 , pp. 255 - 272
Copyright
Copyright © Cambridge University Press 1984

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