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Transport of intense beams with current-dependent initial conditions in linearly tapered solenoid channels

Published online by Cambridge University Press:  21 October 2019

J. R. Harris Open the ORCID record for J. R. Harris [Opens in a new window]
J. R. Harris*
Affiliation:
Air Force Research Laboratory, Albuquerque, NM87117, USA
*
Author for correspondence: J. R. Harris, Kirtland Air Force Base, 3550 Aberdeen Ave. SE, Albuquerque, NM87117, USA.
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Abstract

In electron beams where space charge plays an important role in the beam transport, the beams’ transverse and longitudinal properties will become coupled. One example of this is the transverse–longitudinal correlation produced in a current-modulated beam generated in a DC electron gun, formed through the competition between the time-dependent radial space charge force and the time-independent radial focusing force. This correlation will cause both the slice radius and divergence of the beam extracted from the gun to depend on the slice current. Here we consider the transport of such a beam in a linearly tapered solenoid focusing channel. Transport performance was generally improved with longer taper lengths, minimal initial correlation between slice divergence and slice current, and moderate degrees of initial correlation between initial slice radius and slice current. Performance was also generally improved with lower slice emittances, although surprisingly transport was improved by slightly increasing the assumed slice emittance in certain limited circumstances.

Keywords

beam focusingelectron beamintense beamsSpace charge
Type
Research Article
Information
Laser and Particle Beams , Volume 37 , Issue 4 , December 2019 , pp. 312 - 323
Copyright
Copyright © Cambridge University Press 2019

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