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American Journal of Physics -- August 2009 -- Volume 77, Issue 8, pp. 737

Understanding the focusing of charged particle beams in a solenoid magnetic field

Vinit Kumar

Beam Physics and Free Electron Laser Laboratory, Raja Ramanna Centre for Advanced Technology, Indore, 452013 India

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The focusing of a charged particle beam in a solenoid is typically explained by invoking the concept of a Larmour frame and using Busch’s theorem. Often, there is some confusion about how a uniform magnetic field of a long solenoid focuses the electron beam because it is generally understood that a uniform magnetic field can only guide charged particles. We perform a simple analysis of the dynamics of a charged particle beam in a solenoid and emphasize an intuitive understanding of some of the interesting features.

© 2009 American Association of Physics Teachers

KEYWORDS and PACS

Keywords

electron beam focusing, electron beams, physics education, solenoids, teaching

PACS

  • 41.00.00

    Electromagnetism; electron and ion optics

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History
Received Jan 2009
Accepted Apr 2009
Online Jul 2009

PUBLICATION DATA

ISSN:

0002-9505 (print)  

Publisher:

$abstract.society.value is a Member of CrossRef American Association of Physics Teachers

ARTICLE DATA

Permalink
http://dx.doi.org/10.1119/1.3129242

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